[ { "sku": "UCP201", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 12, "D_mm": 32, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 700, "housing_height_mm": 30.2, "base_length_mm": 127, "bolt_spacing_mm": 95, "bolt_size_mm": 13, "manufacturer_designation": "UCP201", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP201" ], "naming_rule_text": "The NTN UCP201 unit pairs a UC201D1 sealed ball bearing insert with a one-piece P203 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCP201 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 12 mm bore; the UC201D1 designation shows the D1 greasable execution. Boundary data for the 12 mm bore: housing centre height 30.2 mm, base 127 mm, mounting centres 95 mm for M10 fasteners through 13 mm holes; the UC201D1 insert itself is 32 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC201D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP201 weighs about 0.7 kg.", "applications": [ "small packaging and labelling machines", "appliance and HVAC OEM drives", "food-table and bottle-line rollers", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The lip seals and slingers on UCP201 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P203 housing of UCP201: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "At 12 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCP201, so check journal straightness before fitting.", "The standard 2-series insert in UCP201 is the lightest section at 12 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.", "As a pillow block, UCP201 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area." ], "faq": [ { "q": "How is UCP201 locked to the shaft, and how tight should the setscrews be?", "a": "The UC201D1 insert uses two collar setscrews on the 12 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP201 instead of a flanged unit?", "a": "Choose the UCP201 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCP201 unit?", "a": "Yes — UCP201 is an assembly of the P203 housing and UC201D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 12 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCP201 mounted bearing?", "a": "UCP201 takes a 12 mm shaft (insert UC201D1, 32 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts." }, { "q": "What does the UCP201 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 12 mm bore. UCP201 is built from housing P203 plus insert UC201D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP202", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 15, "D_mm": 35, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 700, "housing_height_mm": 30.2, "base_length_mm": 127, "bolt_spacing_mm": 95, "bolt_size_mm": 13, "manufacturer_designation": "UCP202", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP202" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP202 is the classic upright pillow block for a 15 mm shaft: insert UC202D1, housing P203, two foundation bolts. The UCP202 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 15 mm; P203 and UC202D1 are the separate housing and insert part numbers inside. Shaft size is 15 mm; the cast base stands 30.2 mm to the shaft centre (H), is 127 mm long overall (L), and the two foundation holes on 95 mm centres (J) clear 13 mm M10 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Small-bore mounted units like this are chosen mostly to eliminate bearing-housing design work on OEM machines built in the tens of units rather than for duty-cycle reasons. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC202D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP202 weighs about 0.7 kg.", "applications": [ "appliance and HVAC OEM drives", "food-table and bottle-line rollers", "small fans and blowers", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "The standard 2-series insert in UCP202 is the lightest section at 15 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.", "As a pillow block, UCP202 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area.", "When ordering covers for UCP202, note the steel and cast-iron cover executions change the unit mass and envelope but not the 95 mm mounting centres.", "UCP202 weighs little but its cast feet still crack on an uneven weldment; the 95 mm bolt centres must sit on a flat face, not bridge a weld bead." ], "faq": [ { "q": "What are the dimensions of an UCP202 mounted bearing?", "a": "UCP202 takes a 15 mm shaft (insert UC202D1, 35 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts." }, { "q": "What does the UCP202 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 15 mm bore. UCP202 is built from housing P203 plus insert UC202D1 (D1 = greasable)." }, { "q": "How is UCP202 locked to the shaft, and how tight should the setscrews be?", "a": "The UC202D1 insert uses two collar setscrews on the 15 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP202 instead of a flanged unit?", "a": "Choose the UCP202 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP203", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 17, "D_mm": 40, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 700, "housing_height_mm": 30.2, "base_length_mm": 127, "bolt_spacing_mm": 95, "bolt_size_mm": 13, "manufacturer_designation": "UCP203", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP203" ], "naming_rule_text": "NTN ships the UCP203 as a matched assembly — UC203D1 insert swaged into the P203 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 17 mm bore. Key mounting figures: centre height H = 30.2 mm, overall base length L = 127 mm, bolt-hole spacing J = 95 mm, and each of the two feet takes a 13 mm (M10) fastener for the 17 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC203D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP203 weighs about 0.7 kg.", "applications": [ "food-table and bottle-line rollers", "small fans and blowers", "light agricultural augers", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "Small units like UCP203 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 17 mm bore or the points strip out of the shaft.", "The standard 2-series insert in UCP203 is the lightest section at 17 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.", "As a pillow block, UCP203 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area.", "The D1 suffix on UC203D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP203 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC203D1 insert of UCP203 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat." ], "faq": [ { "q": "Does UCP203 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 95 mm bolt centres of UCP203 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCP203 mounted bearing?", "a": "UCP203 takes a 17 mm shaft (insert UC203D1, 40 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts." }, { "q": "What does the UCP203 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 17 mm bore. UCP203 is built from housing P203 plus insert UC203D1 (D1 = greasable)." }, { "q": "How is UCP203 locked to the shaft, and how tight should the setscrews be?", "a": "The UC203D1 insert uses two collar setscrews on the 17 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP203 instead of a flanged unit?", "a": "Choose the UCP203 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP204", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 20, "D_mm": 47, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 700, "housing_height_mm": 33.3, "base_length_mm": 127, "bolt_spacing_mm": 95, "bolt_size_mm": 13, "manufacturer_designation": "UCP204", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP204" ], "naming_rule_text": "UCP204 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC204D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 20 mm shaft size; the unit is built from insert UC204D1 and housing P204. For layout work on UCP204: the 20 mm shaft centre sits 33.3 mm above the sole (H), the footprint is 127 mm long (L), bolt centres are 95 mm (J), and the foot holes suit M10 (13 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC204D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP204 weighs about 0.7 kg.", "applications": [ "small fans and blowers", "light agricultural augers", "light belt and roller conveyors", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "Never weld a bracket to the P204 housing of UCP204: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "At 20 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCP204, so check journal straightness before fitting.", "The standard 2-series insert in UCP204 is the lightest section at 20 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.", "As a pillow block, UCP204 needs a prepared horizontal surface at the 33.3 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area." ], "faq": [ { "q": "How is UCP204 locked to the shaft, and how tight should the setscrews be?", "a": "The UC204D1 insert uses two collar setscrews on the 20 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP204 instead of a flanged unit?", "a": "Choose the UCP204 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 33.3 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP204 mounted bearing?", "a": "UCP204 takes a 20 mm shaft (insert UC204D1, 47 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 33.3 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts." }, { "q": "What does the UCP204 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 20 mm bore. UCP204 is built from housing P204 plus insert UC204D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP205", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 25, "D_mm": 52, "B_mm": 34.1, "seal_type": "2RS", "dynamic_load_kN": 15.5, "static_load_kN": 7.85, "fatigue_load_limit_kN": 0.55, "weight_g": 800, "housing_height_mm": 36.5, "base_length_mm": 140, "bolt_spacing_mm": 105, "bolt_size_mm": 13, "manufacturer_designation": "UCP205", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP205" ], "naming_rule_text": "A 25 mm bore upright mounted bearing, NTN UCP205 combines the UC205D1 self-aligning insert with the grey-iron P205 pillow block base. NTN's numbering ties the unit to its components: UCP205 means the P205 housing carrying the UC205D1 insert, with the last two digits denoting the 25 mm bore in the 2-series duty class. The foundation drawing needs four numbers: H 36.5 mm centre height, L 140 mm total length, J 105 mm between the 13 mm bolt holes, and a 25 mm shaft passing through the 52 mm OD insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UC205D1 insert are 15.5 kN dynamic and 7.85 kN static; the assembled UCP205 weighs about 0.8 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP205 needs a prepared horizontal surface at the 36.5 mm centre height: shim both feet with full-width packs so the 140 mm base seats over its full area.", "At replacement time, measure the 25 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP205 creep identically to the old one.", "UCP205 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 25 mm journal over time.", "The standard section of UCP205 can look adequate at 25 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The standard 2-series insert in UCP205 is the lightest section at 25 mm — do not substitute it into a position that previously ran an X or 3 unit: the 105 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCP205 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 25 mm bore. UCP205 is built from housing P205 plus insert UC205D1 (D1 = greasable)." }, { "q": "How is UCP205 locked to the shaft, and how tight should the setscrews be?", "a": "The UC205D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP205 instead of a flanged unit?", "a": "Choose the UCP205 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 36.5 mm above the 140 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP205 bearing self-aligning?", "a": "Yes within limits. The UC205D1 insert has a spherical outer diameter that pivots in the P205 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP205 mounted bearing?", "a": "UCP205 takes a 25 mm shaft (insert UC205D1, 52 mm OD) and has a unit mass of about 0.8 kg. Housing figures: centre height H 36.5 mm, length L 140 mm, bolt centres J 105 mm, foot holes 13 mm for M10 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX05", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 25, "D_mm": 62, "B_mm": 38.1, "seal_type": "2RS", "dynamic_load_kN": 21.6, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.795, "weight_g": 1400, "housing_height_mm": 44.4, "base_length_mm": 159, "bolt_spacing_mm": 119, "bolt_size_mm": 17, "manufacturer_designation": "UCPX05", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX05" ], "naming_rule_text": "UCPX05 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UCX05D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series X, bore code ending in the 25 mm shaft size; the unit is built from insert UCX05D1 and housing PX05. For layout work on UCPX05: the 25 mm shaft centre sits 44.4 mm above the sole (H), the footprint is 159 mm long (L), bolt centres are 119 mm (J), and the foot holes suit M14 (17 mm) bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UCX05D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCPX05 weighs about 1.4 kg.", "applications": [ "textile line-shafting", "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "Never weld a bracket to the PX05 housing of UCPX05: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "In this bore band the temptation is to choose UCPX05 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The X insert of UCPX05 is wider and rated above the 2-series part at 25 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX05 needs a prepared horizontal surface at the 44.4 mm centre height: shim both feet with full-width packs so the 159 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX05 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX05D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX05 instead of a flanged unit?", "a": "Choose the UCPX05 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 44.4 mm above the 159 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCPX05 mounted bearing?", "a": "UCPX05 takes a 25 mm shaft (insert UCX05D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 44.4 mm, length L 159 mm, bolt centres J 119 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCPX05 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 25 mm bore. UCPX05 is built from housing PX05 plus insert UCX05D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX05", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP305", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 25, "D_mm": 62, "B_mm": 38, "seal_type": "2RS", "dynamic_load_kN": 23.5, "static_load_kN": 10.9, "fatigue_load_limit_kN": 0.855, "weight_g": 1400, "housing_height_mm": 45, "base_length_mm": 175, "bolt_spacing_mm": 132, "bolt_size_mm": 17, "manufacturer_designation": "UCP305", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP305" ], "naming_rule_text": "UCP305 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC305D1) pre-assembled in a P305 two-bolt plummer housing. On the nameplate, UCP305 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 25 mm bore; the UC305D1 designation shows the D1 greasable execution. Boundary data for the 25 mm bore: housing centre height 45 mm, base 175 mm, mounting centres 132 mm for M14 fasteners through 17 mm holes; the UC305D1 insert itself is 62 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC305D1 insert are 23.5 kN dynamic and 10.9 kN static; the assembled UCP305 weighs about 1.4 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The 3-series insert makes UCP305 the highest-rated unit at 25 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP305 needs a prepared horizontal surface at the 45 mm centre height: shim both feet with full-width packs so the 175 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UC305D1 insert of UCP305 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "In this bore band the temptation is to choose UCP305 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCP305 mounted bearing?", "a": "UCP305 takes a 25 mm shaft (insert UC305D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 45 mm, length L 175 mm, bolt centres J 132 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP305 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 25 mm bore. UCP305 is built from housing P305 plus insert UC305D1 (D1 = greasable)." }, { "q": "How is UCP305 locked to the shaft, and how tight should the setscrews be?", "a": "The UC305D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP305 instead of a flanged unit?", "a": "Choose the UCP305 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 45 mm above the 175 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP206", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 30, "D_mm": 62, "B_mm": 38.1, "seal_type": "2RS", "dynamic_load_kN": 21.6, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.795, "weight_g": 1400, "housing_height_mm": 42.9, "base_length_mm": 165, "bolt_spacing_mm": 121, "bolt_size_mm": 17, "manufacturer_designation": "UCP206", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP206" ], "naming_rule_text": "UCP206 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC206D1) pre-assembled in a P206 two-bolt plummer housing. On the nameplate, UCP206 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 30 mm bore; the UC206D1 designation shows the D1 greasable execution. Boundary data for the 30 mm bore: housing centre height 42.9 mm, base 165 mm, mounting centres 121 mm for M14 fasteners through 17 mm holes; the UC206D1 insert itself is 62 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC206D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCP206 weighs about 1.4 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The standard 2-series insert in UCP206 is the lightest section at 30 mm — do not substitute it into a position that previously ran an X or 3 unit: the 121 mm mounting may match while the load rating does not.", "As a pillow block, UCP206 needs a prepared horizontal surface at the 42.9 mm centre height: shim both feet with full-width packs so the 165 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UC206D1 insert of UCP206 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "With a 30 mm shaft the M14 foundation bolts of UCP206 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCP206 mounted bearing?", "a": "UCP206 takes a 30 mm shaft (insert UC206D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 42.9 mm, length L 165 mm, bolt centres J 121 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP206 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 30 mm bore. UCP206 is built from housing P206 plus insert UC206D1 (D1 = greasable)." }, { "q": "How is UCP206 locked to the shaft, and how tight should the setscrews be?", "a": "The UC206D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP206 instead of a flanged unit?", "a": "Choose the UCP206 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 42.9 mm above the 165 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX06", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 30, "D_mm": 72, "B_mm": 42.9, "seal_type": "2RS", "dynamic_load_kN": 28.4, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.09, "weight_g": 1800, "housing_height_mm": 47.6, "base_length_mm": 175, "bolt_spacing_mm": 127, "bolt_size_mm": 17, "manufacturer_designation": "UCPX06", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX06" ], "naming_rule_text": "A 30 mm bore upright mounted bearing, NTN UCPX06 combines the UCX06D1 self-aligning insert with the grey-iron PX06 pillow block base. NTN's numbering ties the unit to its components: UCPX06 means the PX06 housing carrying the UCX06D1 insert, with the last two digits denoting the 30 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 47.6 mm centre height, L 175 mm total length, J 127 mm between the 17 mm bolt holes, and a 30 mm shaft passing through the 72 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UCX06D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCPX06 weighs about 1.8 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCPX06 needs a prepared horizontal surface at the 47.6 mm centre height: shim both feet with full-width packs so the 175 mm base seats over its full area.", "At replacement time, measure the 30 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX06 creep identically to the old one.", "UCPX06 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 30 mm journal over time.", "The standard section of UCPX06 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The X insert of UCPX06 is wider and rated above the 2-series part at 30 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping." ], "faq": [ { "q": "What does the UCPX06 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 30 mm bore. UCPX06 is built from housing PX06 plus insert UCX06D1 (D1 = greasable)." }, { "q": "How is UCPX06 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX06D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX06 instead of a flanged unit?", "a": "Choose the UCPX06 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 47.6 mm above the 175 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCPX06 bearing self-aligning?", "a": "Yes within limits. The UCX06D1 insert has a spherical outer diameter that pivots in the PX06 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCPX06 mounted bearing?", "a": "UCPX06 takes a 30 mm shaft (insert UCX06D1, 72 mm OD) and has a unit mass of about 1.8 kg. Housing figures: centre height H 47.6 mm, length L 175 mm, bolt centres J 127 mm, foot holes 17 mm for M14 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX06", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP306", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 30, "D_mm": 72, "B_mm": 43, "seal_type": "2RS", "dynamic_load_kN": 29.5, "static_load_kN": 15, "fatigue_load_limit_kN": 1.14, "weight_g": 1800, "housing_height_mm": 50, "base_length_mm": 180, "bolt_spacing_mm": 140, "bolt_size_mm": 17, "manufacturer_designation": "UCP306", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP306" ], "naming_rule_text": "The NTN UCP306 unit pairs a UC306D1 sealed ball bearing insert with a one-piece P306 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP306 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 30 mm; P306 and UC306D1 are the separate housing and insert part numbers inside. Shaft size is 30 mm; the cast base stands 50 mm to the shaft centre (H), is 180 mm long overall (L), and the two foundation holes on 140 mm centres (J) clear 17 mm M14 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC306D1 insert are 29.5 kN dynamic and 15 kN static; the assembled UCP306 weighs about 1.8 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCP306, note the steel and cast-iron cover executions change the unit mass and envelope but not the 140 mm mounting centres.", "The standard section of UCP306 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The 3-series insert makes UCP306 the highest-rated unit at 30 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP306 needs a prepared horizontal surface at the 50 mm centre height: shim both feet with full-width packs so the 180 mm base seats over its full area.", "Do not confuse UCP306 with a bare UC306D1 bearing: replacing only the insert is possible, but the housing P306 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a pillow block like UCP306 instead of a flanged unit?", "a": "Choose the UCP306 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 50 mm above the 180 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP306 unit carry?", "a": "The UC306D1 insert is rated at 29.5 kN dynamic and 15 kN basic static (fatigue load limit 1.14 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP306 mounted bearing?", "a": "UCP306 takes a 30 mm shaft (insert UC306D1, 72 mm OD) and has a unit mass of about 1.8 kg. Housing figures: centre height H 50 mm, length L 180 mm, bolt centres J 140 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP306 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 30 mm bore. UCP306 is built from housing P306 plus insert UC306D1 (D1 = greasable)." }, { "q": "How is UCP306 locked to the shaft, and how tight should the setscrews be?", "a": "The UC306D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP207", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 35, "D_mm": 72, "B_mm": 42.9, "seal_type": "2RS", "dynamic_load_kN": 28.4, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.09, "weight_g": 1600, "housing_height_mm": 47.6, "base_length_mm": 167, "bolt_spacing_mm": 127, "bolt_size_mm": 17, "manufacturer_designation": "UCP207", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP207" ], "naming_rule_text": "The NTN UCP207 unit pairs a UC207D1 sealed ball bearing insert with a one-piece P207 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP207 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 35 mm; P207 and UC207D1 are the separate housing and insert part numbers inside. Shaft size is 35 mm; the cast base stands 47.6 mm to the shaft centre (H), is 167 mm long overall (L), and the two foundation holes on 127 mm centres (J) clear 17 mm M14 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC207D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCP207 weighs about 1.6 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCP207, note the steel and cast-iron cover executions change the unit mass and envelope but not the 127 mm mounting centres.", "In this bore band the temptation is to choose UCP207 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The standard 2-series insert in UCP207 is the lightest section at 35 mm — do not substitute it into a position that previously ran an X or 3 unit: the 127 mm mounting may match while the load rating does not.", "As a pillow block, UCP207 needs a prepared horizontal surface at the 47.6 mm centre height: shim both feet with full-width packs so the 167 mm base seats over its full area.", "Do not confuse UCP207 with a bare UC207D1 bearing: replacing only the insert is possible, but the housing P207 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a pillow block like UCP207 instead of a flanged unit?", "a": "Choose the UCP207 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 47.6 mm above the 167 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP207 unit carry?", "a": "The UC207D1 insert is rated at 28.4 kN dynamic and 15.3 kN basic static (fatigue load limit 1.09 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP207 mounted bearing?", "a": "UCP207 takes a 35 mm shaft (insert UC207D1, 72 mm OD) and has a unit mass of about 1.6 kg. Housing figures: centre height H 47.6 mm, length L 167 mm, bolt centres J 127 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP207 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 35 mm bore. UCP207 is built from housing P207 plus insert UC207D1 (D1 = greasable)." }, { "q": "How is UCP207 locked to the shaft, and how tight should the setscrews be?", "a": "The UC207D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX07", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 35, "D_mm": 80, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "weight_g": 2400, "housing_height_mm": 54, "base_length_mm": 203, "bolt_spacing_mm": 144, "bolt_size_mm": 17, "manufacturer_designation": "UCPX07", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX07" ], "naming_rule_text": "UCPX07 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX07D1) pre-assembled in a PX07 two-bolt plummer housing. On the nameplate, UCPX07 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 35 mm bore; the UCX07D1 designation shows the D1 greasable execution. Boundary data for the 35 mm bore: housing centre height 54 mm, base 203 mm, mounting centres 144 mm for M14 fasteners through 17 mm holes; the UCX07D1 insert itself is 80 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UCX07D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCPX07 weighs about 2.4 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The X insert of UCPX07 is wider and rated above the 2-series part at 35 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX07 needs a prepared horizontal surface at the 54 mm centre height: shim both feet with full-width packs so the 203 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UCX07D1 insert of UCPX07 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "With a 35 mm shaft the M14 foundation bolts of UCPX07 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCPX07 mounted bearing?", "a": "UCPX07 takes a 35 mm shaft (insert UCX07D1, 80 mm OD) and has a unit mass of about 2.4 kg. Housing figures: centre height H 54 mm, length L 203 mm, bolt centres J 144 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCPX07 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 35 mm bore. UCPX07 is built from housing PX07 plus insert UCX07D1 (D1 = greasable)." }, { "q": "How is UCPX07 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX07D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX07 instead of a flanged unit?", "a": "Choose the UCPX07 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 54 mm above the 203 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX07", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP307", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 35, "D_mm": 80, "B_mm": 48, "seal_type": "2RS", "dynamic_load_kN": 37, "static_load_kN": 19.1, "fatigue_load_limit_kN": 1.47, "weight_g": 2500, "housing_height_mm": 56, "base_length_mm": 210, "bolt_spacing_mm": 160, "bolt_size_mm": 17, "manufacturer_designation": "UCP307", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP307" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP307 is the classic upright pillow block for a 35 mm shaft: insert UC307D1, housing P307, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 35 mm bore. Key mounting figures: centre height H = 56 mm, overall base length L = 210 mm, bolt-hole spacing J = 160 mm, and each of the two feet takes a 17 mm (M14) fastener for the 35 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC307D1 insert are 37 kN dynamic and 19.1 kN static; the assembled UCP307 weighs about 2.5 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCP307 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 35 mm journal over time.", "With a 35 mm shaft the M14 foundation bolts of UCP307 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The 3-series insert makes UCP307 the highest-rated unit at 35 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP307 needs a prepared horizontal surface at the 56 mm centre height: shim both feet with full-width packs so the 210 mm base seats over its full area." ], "faq": [ { "q": "How is UCP307 locked to the shaft, and how tight should the setscrews be?", "a": "The UC307D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP307 instead of a flanged unit?", "a": "Choose the UCP307 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 56 mm above the 210 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP307 mounted bearing?", "a": "UCP307 takes a 35 mm shaft (insert UC307D1, 80 mm OD) and has a unit mass of about 2.5 kg. Housing figures: centre height H 56 mm, length L 210 mm, bolt centres J 160 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP307 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 35 mm bore. UCP307 is built from housing P307 plus insert UC307D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP208", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 40, "D_mm": 80, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "weight_g": 1900, "housing_height_mm": 49.2, "base_length_mm": 184, "bolt_spacing_mm": 137, "bolt_size_mm": 17, "manufacturer_designation": "UCP208", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP208" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP208 is the classic upright pillow block for a 40 mm shaft: insert UC208D1, housing P208, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 40 mm bore. Key mounting figures: centre height H = 49.2 mm, overall base length L = 184 mm, bolt-hole spacing J = 137 mm, and each of the two feet takes a 17 mm (M14) fastener for the 40 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC208D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCP208 weighs about 1.9 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCP208 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 40 mm journal over time.", "The standard section of UCP208 can look adequate at 40 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The standard 2-series insert in UCP208 is the lightest section at 40 mm — do not substitute it into a position that previously ran an X or 3 unit: the 137 mm mounting may match while the load rating does not.", "As a pillow block, UCP208 needs a prepared horizontal surface at the 49.2 mm centre height: shim both feet with full-width packs so the 184 mm base seats over its full area." ], "faq": [ { "q": "How is UCP208 locked to the shaft, and how tight should the setscrews be?", "a": "The UC208D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP208 instead of a flanged unit?", "a": "Choose the UCP208 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 49.2 mm above the 184 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP208 mounted bearing?", "a": "UCP208 takes a 40 mm shaft (insert UC208D1, 80 mm OD) and has a unit mass of about 1.9 kg. Housing figures: centre height H 49.2 mm, length L 184 mm, bolt centres J 137 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP208 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 40 mm bore. UCP208 is built from housing P208 plus insert UC208D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX08", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 40, "D_mm": 90, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "weight_g": 2900, "housing_height_mm": 58.7, "base_length_mm": 222, "bolt_spacing_mm": 156, "bolt_size_mm": 20, "manufacturer_designation": "UCPX08", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX08" ], "naming_rule_text": "The NTN UCPX08 unit pairs a UCX08D1 sealed ball bearing insert with a one-piece PX08 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCPX08 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 40 mm; PX08 and UCX08D1 are the separate housing and insert part numbers inside. Shaft size is 40 mm; the cast base stands 58.7 mm to the shaft centre (H), is 222 mm long overall (L), and the two foundation holes on 156 mm centres (J) clear 20 mm M16 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UCX08D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCPX08 weighs about 2.9 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCPX08, note the steel and cast-iron cover executions change the unit mass and envelope but not the 156 mm mounting centres.", "In this bore band the temptation is to choose UCPX08 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The X insert of UCPX08 is wider and rated above the 2-series part at 40 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX08 needs a prepared horizontal surface at the 58.7 mm centre height: shim both feet with full-width packs so the 222 mm base seats over its full area.", "Do not confuse UCPX08 with a bare UCX08D1 bearing: replacing only the insert is possible, but the housing PX08 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a pillow block like UCPX08 instead of a flanged unit?", "a": "Choose the UCPX08 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 58.7 mm above the 222 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCPX08 unit carry?", "a": "The UCX08D1 insert is rated at 36 kN dynamic and 20.4 kN basic static (fatigue load limit 1.6 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCPX08 mounted bearing?", "a": "UCPX08 takes a 40 mm shaft (insert UCX08D1, 90 mm OD) and has a unit mass of about 2.9 kg. Housing figures: centre height H 58.7 mm, length L 222 mm, bolt centres J 156 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCPX08 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 40 mm bore. UCPX08 is built from housing PX08 plus insert UCX08D1 (D1 = greasable)." }, { "q": "How is UCPX08 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX08D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX08", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP308", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 40, "D_mm": 90, "B_mm": 52, "seal_type": "2RS", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "weight_g": 3000, "housing_height_mm": 60, "base_length_mm": 220, "bolt_spacing_mm": 170, "bolt_size_mm": 17, "manufacturer_designation": "UCP308", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP308" ], "naming_rule_text": "NTN ships the UCP308 as a matched assembly — UC308D1 insert swaged into the P308 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 40 mm shaft size; the unit is built from insert UC308D1 and housing P308. For layout work on UCP308: the 40 mm shaft centre sits 60 mm above the sole (H), the footprint is 220 mm long (L), bolt centres are 170 mm (J), and the foot holes suit M14 (17 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC308D1 insert are 45 kN dynamic and 24 kN static; the assembled UCP308 weighs about 3.0 kg.", "applications": [ "small crushers and screening feeds", "textile line-shafting", "machine-tool chip conveyors", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCP308 the highest-rated unit at 40 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP308 needs a prepared horizontal surface at the 60 mm centre height: shim both feet with full-width packs so the 220 mm base seats over its full area.", "The lip seals and slingers on UCP308 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P308 housing of UCP308: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "In this bore band the temptation is to choose UCP308 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCP308 mounted bearing?", "a": "UCP308 takes a 40 mm shaft (insert UC308D1, 90 mm OD) and has a unit mass of about 3.0 kg. Housing figures: centre height H 60 mm, length L 220 mm, bolt centres J 170 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP308 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 40 mm bore. UCP308 is built from housing P308 plus insert UC308D1 (D1 = greasable)." }, { "q": "How is UCP308 locked to the shaft, and how tight should the setscrews be?", "a": "The UC308D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP308 instead of a flanged unit?", "a": "Choose the UCP308 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 60 mm above the 220 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP308 unit?", "a": "There is no single interval for UCP308: the UC308D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP209", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 45, "D_mm": 85, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "weight_g": 2200, "housing_height_mm": 54, "base_length_mm": 190, "bolt_spacing_mm": 146, "bolt_size_mm": 17, "manufacturer_designation": "UCP209", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP209" ], "naming_rule_text": "NTN ships the UCP209 as a matched assembly — UC209D1 insert swaged into the P209 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 45 mm shaft size; the unit is built from insert UC209D1 and housing P209. For layout work on UCP209: the 45 mm shaft centre sits 54 mm above the sole (H), the footprint is 190 mm long (L), bolt centres are 146 mm (J), and the foot holes suit M14 (17 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC209D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCP209 weighs about 2.2 kg.", "applications": [ "small crushers and screening feeds", "textile line-shafting", "machine-tool chip conveyors", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCP209 is the lightest section at 45 mm — do not substitute it into a position that previously ran an X or 3 unit: the 146 mm mounting may match while the load rating does not.", "As a pillow block, UCP209 needs a prepared horizontal surface at the 54 mm centre height: shim both feet with full-width packs so the 190 mm base seats over its full area.", "The lip seals and slingers on UCP209 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P209 housing of UCP209: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "With a 45 mm shaft the M14 foundation bolts of UCP209 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCP209 mounted bearing?", "a": "UCP209 takes a 45 mm shaft (insert UC209D1, 85 mm OD) and has a unit mass of about 2.2 kg. Housing figures: centre height H 54 mm, length L 190 mm, bolt centres J 146 mm, foot holes 17 mm for M14 bolts." }, { "q": "What does the UCP209 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 45 mm bore. UCP209 is built from housing P209 plus insert UC209D1 (D1 = greasable)." }, { "q": "How is UCP209 locked to the shaft, and how tight should the setscrews be?", "a": "The UC209D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP209 instead of a flanged unit?", "a": "Choose the UCP209 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 54 mm above the 190 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP209 unit?", "a": "There is no single interval for UCP209: the UC209D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX09", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 45, "D_mm": 100, "B_mm": 51.6, "seal_type": "2RS", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "weight_g": 3200, "housing_height_mm": 58.7, "base_length_mm": 222, "bolt_spacing_mm": 156, "bolt_size_mm": 20, "manufacturer_designation": "UCPX09", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX09" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCPX09 is the classic upright pillow block for a 45 mm shaft: insert UCX09D1, housing PX09, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 45 mm bore. Key mounting figures: centre height H = 58.7 mm, overall base length L = 222 mm, bolt-hole spacing J = 156 mm, and each of the two feet takes a 20 mm (M16) fastener for the 45 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UCX09D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCPX09 weighs about 3.2 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCPX09 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 45 mm journal over time.", "The standard section of UCPX09 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The X insert of UCPX09 is wider and rated above the 2-series part at 45 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX09 needs a prepared horizontal surface at the 58.7 mm centre height: shim both feet with full-width packs so the 222 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX09 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX09D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX09 instead of a flanged unit?", "a": "Choose the UCPX09 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 58.7 mm above the 222 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCPX09 mounted bearing?", "a": "UCPX09 takes a 45 mm shaft (insert UCX09D1, 100 mm OD) and has a unit mass of about 3.2 kg. Housing figures: centre height H 58.7 mm, length L 222 mm, bolt centres J 156 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCPX09 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 45 mm bore. UCPX09 is built from housing PX09 plus insert UCX09D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX09", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP309", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 45, "D_mm": 100, "B_mm": 57, "seal_type": "2RS", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "weight_g": 4100, "housing_height_mm": 67, "base_length_mm": 245, "bolt_spacing_mm": 190, "bolt_size_mm": 20, "manufacturer_designation": "UCP309", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP309" ], "naming_rule_text": "UCP309 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC309D1 insert. NTN's numbering ties the unit to its components: UCP309 means the P309 housing carrying the UC309D1 insert, with the last two digits denoting the 45 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 67 mm centre height, L 245 mm total length, J 190 mm between the 20 mm bolt holes, and a 45 mm shaft passing through the 100 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC309D1 insert are 58.5 kN dynamic and 32 kN static; the assembled UCP309 weighs about 4.1 kg.", "applications": [ "textile line-shafting", "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "The 3-series insert makes UCP309 the highest-rated unit at 45 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP309 needs a prepared horizontal surface at the 67 mm centre height: shim both feet with full-width packs so the 245 mm base seats over its full area.", "When ordering covers for UCP309, note the steel and cast-iron cover executions change the unit mass and envelope but not the 190 mm mounting centres.", "The standard section of UCP309 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide." ], "faq": [ { "q": "What are the dimensions of an UCP309 mounted bearing?", "a": "UCP309 takes a 45 mm shaft (insert UC309D1, 100 mm OD) and has a unit mass of about 4.1 kg. Housing figures: centre height H 67 mm, length L 245 mm, bolt centres J 190 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCP309 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 45 mm bore. UCP309 is built from housing P309 plus insert UC309D1 (D1 = greasable)." }, { "q": "How is UCP309 locked to the shaft, and how tight should the setscrews be?", "a": "The UC309D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP309 instead of a flanged unit?", "a": "Choose the UCP309 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 67 mm above the 245 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP210", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 50, "D_mm": 90, "B_mm": 51.6, "seal_type": "2RS", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "weight_g": 2700, "housing_height_mm": 57.2, "base_length_mm": 206, "bolt_spacing_mm": 159, "bolt_size_mm": 20, "manufacturer_designation": "UCP210", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP210" ], "naming_rule_text": "The NTN UCP210 unit pairs a UC210D1 sealed ball bearing insert with a one-piece P210 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCP210 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 50 mm bore; the UC210D1 designation shows the D1 greasable execution. Boundary data for the 50 mm bore: housing centre height 57.2 mm, base 206 mm, mounting centres 159 mm for M16 fasteners through 20 mm holes; the UC210D1 insert itself is 90 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC210D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCP210 weighs about 2.7 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "Do not confuse UCP210 with a bare UC210D1 bearing: replacing only the insert is possible, but the housing P210 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP210, note the steel and cast-iron cover executions change the unit mass and envelope but not the 159 mm mounting centres.", "In this bore band the temptation is to choose UCP210 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The standard 2-series insert in UCP210 is the lightest section at 50 mm — do not substitute it into a position that previously ran an X or 3 unit: the 159 mm mounting may match while the load rating does not.", "As a pillow block, UCP210 needs a prepared horizontal surface at the 57.2 mm centre height: shim both feet with full-width packs so the 206 mm base seats over its full area." ], "faq": [ { "q": "How is UCP210 locked to the shaft, and how tight should the setscrews be?", "a": "The UC210D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP210 instead of a flanged unit?", "a": "Choose the UCP210 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 57.2 mm above the 206 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCP210 unit?", "a": "Yes — UCP210 is an assembly of the P210 housing and UC210D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 50 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCP210 mounted bearing?", "a": "UCP210 takes a 50 mm shaft (insert UC210D1, 90 mm OD) and has a unit mass of about 2.7 kg. Housing figures: centre height H 57.2 mm, length L 206 mm, bolt centres J 159 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCP210 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 50 mm bore. UCP210 is built from housing P210 plus insert UC210D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX10", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 50, "D_mm": 110, "B_mm": 55.6, "seal_type": "2RS", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "weight_g": 4100, "housing_height_mm": 63.5, "base_length_mm": 241, "bolt_spacing_mm": 171, "bolt_size_mm": 20, "manufacturer_designation": "UCPX10", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX10" ], "naming_rule_text": "UCPX10 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX10D1) pre-assembled in a PX10 two-bolt plummer housing. NTN's numbering ties the unit to its components: UCPX10 means the PX10 housing carrying the UCX10D1 insert, with the last two digits denoting the 50 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 63.5 mm centre height, L 241 mm total length, J 171 mm between the 20 mm bolt holes, and a 50 mm shaft passing through the 110 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UCX10D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCPX10 weighs about 4.1 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "The X insert of UCPX10 is wider and rated above the 2-series part at 50 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX10 needs a prepared horizontal surface at the 63.5 mm centre height: shim both feet with full-width packs so the 241 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UCX10D1 insert of UCPX10 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "With a 50 mm shaft the M16 foundation bolts of UCPX10 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCPX10 mounted bearing?", "a": "UCPX10 takes a 50 mm shaft (insert UCX10D1, 110 mm OD) and has a unit mass of about 4.1 kg. Housing figures: centre height H 63.5 mm, length L 241 mm, bolt centres J 171 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCPX10 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 50 mm bore. UCPX10 is built from housing PX10 plus insert UCX10D1 (D1 = greasable)." }, { "q": "How is UCPX10 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX10D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX10 instead of a flanged unit?", "a": "Choose the UCPX10 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 63.5 mm above the 241 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX10", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP310", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 50, "D_mm": 110, "B_mm": 61, "seal_type": "2RS", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "weight_g": 5600, "housing_height_mm": 75, "base_length_mm": 275, "bolt_spacing_mm": 212, "bolt_size_mm": 20, "manufacturer_designation": "UCP310", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP310" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP310 is the classic upright pillow block for a 50 mm shaft: insert UC310D1, housing P310, two foundation bolts. The UCP310 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 50 mm; P310 and UC310D1 are the separate housing and insert part numbers inside. Shaft size is 50 mm; the cast base stands 75 mm to the shaft centre (H), is 275 mm long overall (L), and the two foundation holes on 212 mm centres (J) clear 20 mm M16 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC310D1 insert are 68.5 kN dynamic and 38.5 kN static; the assembled UCP310 weighs about 5.6 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "UCP310 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 50 mm journal over time.", "With a 50 mm shaft the M16 foundation bolts of UCP310 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The 3-series insert makes UCP310 the highest-rated unit at 50 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP310 needs a prepared horizontal surface at the 75 mm centre height: shim both feet with full-width packs so the 275 mm base seats over its full area." ], "faq": [ { "q": "How is UCP310 locked to the shaft, and how tight should the setscrews be?", "a": "The UC310D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP310 instead of a flanged unit?", "a": "Choose the UCP310 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 75 mm above the 275 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP310 mounted bearing?", "a": "UCP310 takes a 50 mm shaft (insert UC310D1, 110 mm OD) and has a unit mass of about 5.6 kg. Housing figures: centre height H 75 mm, length L 275 mm, bolt centres J 212 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCP310 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 50 mm bore. UCP310 is built from housing P310 plus insert UC310D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP211", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 55, "D_mm": 100, "B_mm": 55.6, "seal_type": "2RS", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "weight_g": 3400, "housing_height_mm": 63.5, "base_length_mm": 219, "bolt_spacing_mm": 171, "bolt_size_mm": 20, "manufacturer_designation": "UCP211", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP211" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP211 is the classic upright pillow block for a 55 mm shaft: insert UC211D1, housing P211, two foundation bolts. The UCP211 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 55 mm; P211 and UC211D1 are the separate housing and insert part numbers inside. Shaft size is 55 mm; the cast base stands 63.5 mm to the shaft centre (H), is 219 mm long overall (L), and the two foundation holes on 171 mm centres (J) clear 20 mm M16 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC211D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCP211 weighs about 3.4 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "UCP211 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 55 mm journal over time.", "UCP211 at 55 mm uses M16 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 63.5 mm centre height and binds the insert.", "The standard 2-series insert in UCP211 is the lightest section at 55 mm — do not substitute it into a position that previously ran an X or 3 unit: the 171 mm mounting may match while the load rating does not.", "As a pillow block, UCP211 needs a prepared horizontal surface at the 63.5 mm centre height: shim both feet with full-width packs so the 219 mm base seats over its full area." ], "faq": [ { "q": "How is UCP211 locked to the shaft, and how tight should the setscrews be?", "a": "The UC211D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP211 instead of a flanged unit?", "a": "Choose the UCP211 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 63.5 mm above the 219 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP211 mounted bearing?", "a": "UCP211 takes a 55 mm shaft (insert UC211D1, 100 mm OD) and has a unit mass of about 3.4 kg. Housing figures: centre height H 63.5 mm, length L 219 mm, bolt centres J 171 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCP211 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 55 mm bore. UCP211 is built from housing P211 plus insert UC211D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX11", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 55, "D_mm": 120, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "weight_g": 5400, "housing_height_mm": 69.8, "base_length_mm": 260, "bolt_spacing_mm": 184, "bolt_size_mm": 25, "manufacturer_designation": "UCPX11", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX11" ], "naming_rule_text": "The NTN UCPX11 unit pairs a UCX11D1 sealed ball bearing insert with a one-piece PX11 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCPX11 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 55 mm bore; the UCX11D1 designation shows the D1 greasable execution. Boundary data for the 55 mm bore: housing centre height 69.8 mm, base 260 mm, mounting centres 184 mm for M20 fasteners through 25 mm holes; the UCX11D1 insert itself is 120 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UCX11D1 insert are 58 kN dynamic and 36 kN static; the assembled UCPX11 weighs about 5.4 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "Do not confuse UCPX11 with a bare UCX11D1 bearing: replacing only the insert is possible, but the housing PX11 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCPX11, note the steel and cast-iron cover executions change the unit mass and envelope but not the 184 mm mounting centres.", "At 55 mm bore the 260 mm base of UCPX11 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The X insert of UCPX11 is wider and rated above the 2-series part at 55 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX11 needs a prepared horizontal surface at the 69.8 mm centre height: shim both feet with full-width packs so the 260 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX11 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX11D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX11 instead of a flanged unit?", "a": "Choose the UCPX11 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 69.8 mm above the 260 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCPX11 unit?", "a": "Yes — UCPX11 is an assembly of the PX11 housing and UCX11D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 55 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCPX11 mounted bearing?", "a": "UCPX11 takes a 55 mm shaft (insert UCX11D1, 120 mm OD) and has a unit mass of about 5.4 kg. Housing figures: centre height H 69.8 mm, length L 260 mm, bolt centres J 184 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCPX11 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 55 mm bore. UCPX11 is built from housing PX11 plus insert UCX11D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX11", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP311", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 55, "D_mm": 120, "B_mm": 66, "seal_type": "2RS", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "weight_g": 7300, "housing_height_mm": 80, "base_length_mm": 310, "bolt_spacing_mm": 236, "bolt_size_mm": 20, "manufacturer_designation": "UCP311", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP311" ], "naming_rule_text": "NTN ships the UCP311 as a matched assembly — UC311D1 insert swaged into the P311 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 55 mm bore. Key mounting figures: centre height H = 80 mm, overall base length L = 310 mm, bolt-hole spacing J = 236 mm, and each of the two feet takes a 20 mm (M16) fastener for the 55 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC311D1 insert are 79.5 kN dynamic and 45 kN static; the assembled UCP311 weighs about 7.3 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 55 mm bore the 310 mm base of UCP311 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCP311 the highest-rated unit at 55 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP311 needs a prepared horizontal surface at the 80 mm centre height: shim both feet with full-width packs so the 310 mm base seats over its full area.", "The lip seals and slingers on UCP311 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P311 housing of UCP311: local heat cracks cast iron and distorts the spherical bore that the insert depends on." ], "faq": [ { "q": "Does UCP311 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 236 mm bolt centres of UCP311 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCP311 mounted bearing?", "a": "UCP311 takes a 55 mm shaft (insert UC311D1, 120 mm OD) and has a unit mass of about 7.3 kg. Housing figures: centre height H 80 mm, length L 310 mm, bolt centres J 236 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCP311 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 55 mm bore. UCP311 is built from housing P311 plus insert UC311D1 (D1 = greasable)." }, { "q": "How is UCP311 locked to the shaft, and how tight should the setscrews be?", "a": "The UC311D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP311 instead of a flanged unit?", "a": "Choose the UCP311 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 80 mm above the 310 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP212", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 60, "D_mm": 110, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "weight_g": 4700, "housing_height_mm": 69.8, "base_length_mm": 241, "bolt_spacing_mm": 184, "bolt_size_mm": 20, "manufacturer_designation": "UCP212", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP212" ], "naming_rule_text": "NTN ships the UCP212 as a matched assembly — UC212D1 insert swaged into the P212 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 60 mm bore. Key mounting figures: centre height H = 69.8 mm, overall base length L = 241 mm, bolt-hole spacing J = 184 mm, and each of the two feet takes a 20 mm (M16) fastener for the 60 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC212D1 insert are 58 kN dynamic and 36 kN static; the assembled UCP212 weighs about 4.7 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "Heavy drives on UCP212 should have the setscrews re-torqued after the first day; at 60 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCP212 is the lightest section at 60 mm — do not substitute it into a position that previously ran an X or 3 unit: the 184 mm mounting may match while the load rating does not.", "As a pillow block, UCP212 needs a prepared horizontal surface at the 69.8 mm centre height: shim both feet with full-width packs so the 241 mm base seats over its full area.", "The lip seals and slingers on UCP212 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P212 housing of UCP212: local heat cracks cast iron and distorts the spherical bore that the insert depends on." ], "faq": [ { "q": "Does UCP212 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 184 mm bolt centres of UCP212 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCP212 mounted bearing?", "a": "UCP212 takes a 60 mm shaft (insert UC212D1, 110 mm OD) and has a unit mass of about 4.7 kg. Housing figures: centre height H 69.8 mm, length L 241 mm, bolt centres J 184 mm, foot holes 20 mm for M16 bolts." }, { "q": "What does the UCP212 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 60 mm bore. UCP212 is built from housing P212 plus insert UC212D1 (D1 = greasable)." }, { "q": "How is UCP212 locked to the shaft, and how tight should the setscrews be?", "a": "The UC212D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP212 instead of a flanged unit?", "a": "Choose the UCP212 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 69.8 mm above the 241 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX12", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 60, "D_mm": 130, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "weight_g": 6800, "housing_height_mm": 76.2, "base_length_mm": 286, "bolt_spacing_mm": 203, "bolt_size_mm": 25, "manufacturer_designation": "UCPX12", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX12" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCPX12 is the classic upright pillow block for a 60 mm shaft: insert UCX12D1, housing PX12, two foundation bolts. The UCPX12 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 60 mm; PX12 and UCX12D1 are the separate housing and insert part numbers inside. Shaft size is 60 mm; the cast base stands 76.2 mm to the shaft centre (H), is 286 mm long overall (L), and the two foundation holes on 203 mm centres (J) clear 25 mm M20 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UCX12D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCPX12 weighs about 6.8 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "UCPX12 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 60 mm journal over time.", "UCPX12 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 76.2 mm centre height and binds the insert.", "The X insert of UCPX12 is wider and rated above the 2-series part at 60 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX12 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 286 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX12 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX12D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX12 instead of a flanged unit?", "a": "Choose the UCPX12 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 286 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCPX12 mounted bearing?", "a": "UCPX12 takes a 60 mm shaft (insert UCX12D1, 130 mm OD) and has a unit mass of about 6.8 kg. Housing figures: centre height H 76.2 mm, length L 286 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCPX12 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 60 mm bore. UCPX12 is built from housing PX12 plus insert UCX12D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX12", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP312", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 60, "D_mm": 130, "B_mm": 71, "seal_type": "2RS", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "weight_g": 9400, "housing_height_mm": 85, "base_length_mm": 330, "bolt_spacing_mm": 250, "bolt_size_mm": 25, "manufacturer_designation": "UCP312", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP312" ], "naming_rule_text": "UCP312 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC312D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 60 mm shaft size; the unit is built from insert UC312D1 and housing P312. For layout work on UCP312: the 60 mm shaft centre sits 85 mm above the sole (H), the footprint is 330 mm long (L), bolt centres are 250 mm (J), and the foot holes suit M20 (25 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC312D1 insert are 90.5 kN dynamic and 52 kN static; the assembled UCP312 weighs about 9.4 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The 3-series insert makes UCP312 the highest-rated unit at 60 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP312 needs a prepared horizontal surface at the 85 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.", "When ordering covers for UCP312, note the steel and cast-iron cover executions change the unit mass and envelope but not the 250 mm mounting centres.", "UCP312 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 85 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCP312 mounted bearing?", "a": "UCP312 takes a 60 mm shaft (insert UC312D1, 130 mm OD) and has a unit mass of about 9.4 kg. Housing figures: centre height H 85 mm, length L 330 mm, bolt centres J 250 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP312 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 60 mm bore. UCP312 is built from housing P312 plus insert UC312D1 (D1 = greasable)." }, { "q": "How is UCP312 locked to the shaft, and how tight should the setscrews be?", "a": "The UC312D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP312 instead of a flanged unit?", "a": "Choose the UCP312 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 85 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP213", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 65, "D_mm": 120, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "weight_g": 5600, "housing_height_mm": 76.2, "base_length_mm": 265, "bolt_spacing_mm": 203, "bolt_size_mm": 25, "manufacturer_designation": "UCP213", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP213" ], "naming_rule_text": "UCP213 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC213D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 65 mm shaft size; the unit is built from insert UC213D1 and housing P213. For layout work on UCP213: the 65 mm shaft centre sits 76.2 mm above the sole (H), the footprint is 265 mm long (L), bolt centres are 203 mm (J), and the foot holes suit M20 (25 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC213D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCP213 weighs about 5.6 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The standard 2-series insert in UCP213 is the lightest section at 65 mm — do not substitute it into a position that previously ran an X or 3 unit: the 203 mm mounting may match while the load rating does not.", "As a pillow block, UCP213 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 265 mm base seats over its full area.", "When ordering covers for UCP213, note the steel and cast-iron cover executions change the unit mass and envelope but not the 203 mm mounting centres.", "At 65 mm bore the 265 mm base of UCP213 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCP213 mounted bearing?", "a": "UCP213 takes a 65 mm shaft (insert UC213D1, 120 mm OD) and has a unit mass of about 5.6 kg. Housing figures: centre height H 76.2 mm, length L 265 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP213 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 65 mm bore. UCP213 is built from housing P213 plus insert UC213D1 (D1 = greasable)." }, { "q": "How is UCP213 locked to the shaft, and how tight should the setscrews be?", "a": "The UC213D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP213 instead of a flanged unit?", "a": "Choose the UCP213 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 265 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP213", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX13", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 65, "D_mm": 140, "B_mm": 74.6, "seal_type": "2RS", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "weight_g": 7100, "housing_height_mm": 76.2, "base_length_mm": 286, "bolt_spacing_mm": 203, "bolt_size_mm": 25, "manufacturer_designation": "UCPX13", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX13" ], "naming_rule_text": "NTN ships the UCPX13 as a matched assembly — UCX13D1 insert swaged into the PX13 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 65 mm bore. Key mounting figures: centre height H = 76.2 mm, overall base length L = 286 mm, bolt-hole spacing J = 203 mm, and each of the two feet takes a 25 mm (M20) fastener for the 65 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UCX13D1 insert are 69 kN dynamic and 44 kN static; the assembled UCPX13 weighs about 7.1 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "Heavy drives on UCPX13 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The X insert of UCPX13 is wider and rated above the 2-series part at 65 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX13 needs a prepared horizontal surface at the 76.2 mm centre height: shim both feet with full-width packs so the 286 mm base seats over its full area.", "The lip seals and slingers on UCPX13 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the PX13 housing of UCPX13: local heat cracks cast iron and distorts the spherical bore that the insert depends on." ], "faq": [ { "q": "Does UCPX13 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 203 mm bolt centres of UCPX13 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCPX13 mounted bearing?", "a": "UCPX13 takes a 65 mm shaft (insert UCX13D1, 140 mm OD) and has a unit mass of about 7.1 kg. Housing figures: centre height H 76.2 mm, length L 286 mm, bolt centres J 203 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCPX13 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 65 mm bore. UCPX13 is built from housing PX13 plus insert UCX13D1 (D1 = greasable)." }, { "q": "How is UCPX13 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX13D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX13 instead of a flanged unit?", "a": "Choose the UCPX13 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 76.2 mm above the 286 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX13", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP313", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 65, "D_mm": 140, "B_mm": 75, "seal_type": "2RS", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "weight_g": 10000, "housing_height_mm": 90, "base_length_mm": 340, "bolt_spacing_mm": 260, "bolt_size_mm": 25, "manufacturer_designation": "UCP313", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP313" ], "naming_rule_text": "A 65 mm bore upright mounted bearing, NTN UCP313 combines the UC313D1 self-aligning insert with the grey-iron P313 pillow block base. NTN's numbering ties the unit to its components: UCP313 means the P313 housing carrying the UC313D1 insert, with the last two digits denoting the 65 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 90 mm centre height, L 340 mm total length, J 260 mm between the 25 mm bolt holes, and a 65 mm shaft passing through the 140 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC313D1 insert are 103 kN dynamic and 60 kN static; the assembled UCP313 weighs about 10.0 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP313 needs a prepared horizontal surface at the 90 mm centre height: shim both feet with full-width packs so the 340 mm base seats over its full area.", "The D1 suffix on UC313D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP313 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC313D1 insert of UCP313 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "Heavy drives on UCP313 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The 3-series insert makes UCP313 the highest-rated unit at 65 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCP313 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 65 mm bore. UCP313 is built from housing P313 plus insert UC313D1 (D1 = greasable)." }, { "q": "How is UCP313 locked to the shaft, and how tight should the setscrews be?", "a": "The UC313D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP313 instead of a flanged unit?", "a": "Choose the UCP313 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 90 mm above the 340 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP313 bearing self-aligning?", "a": "Yes within limits. The UC313D1 insert has a spherical outer diameter that pivots in the P313 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP313 mounted bearing?", "a": "UCP313 takes a 65 mm shaft (insert UC313D1, 140 mm OD) and has a unit mass of about 10.0 kg. Housing figures: centre height H 90 mm, length L 340 mm, bolt centres J 260 mm, foot holes 25 mm for M20 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP214", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 70, "D_mm": 125, "B_mm": 74.6, "seal_type": "2RS", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "weight_g": 6500, "housing_height_mm": 79.4, "base_length_mm": 266, "bolt_spacing_mm": 210, "bolt_size_mm": 25, "manufacturer_designation": "UCP214", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP214" ], "naming_rule_text": "A 70 mm bore upright mounted bearing, NTN UCP214 combines the UC214D1 self-aligning insert with the grey-iron P214 pillow block base. NTN's numbering ties the unit to its components: UCP214 means the P214 housing carrying the UC214D1 insert, with the last two digits denoting the 70 mm bore in the 2-series duty class. The foundation drawing needs four numbers: H 79.4 mm centre height, L 266 mm total length, J 210 mm between the 25 mm bolt holes, and a 70 mm shaft passing through the 125 mm OD insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UC214D1 insert are 69 kN dynamic and 44 kN static; the assembled UCP214 weighs about 6.5 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP214 needs a prepared horizontal surface at the 79.4 mm centre height: shim both feet with full-width packs so the 266 mm base seats over its full area.", "The D1 suffix on UC214D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP214 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC214D1 insert of UCP214 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCP214 at 70 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 79.4 mm centre height and binds the insert.", "The standard 2-series insert in UCP214 is the lightest section at 70 mm — do not substitute it into a position that previously ran an X or 3 unit: the 210 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCP214 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 70 mm bore. UCP214 is built from housing P214 plus insert UC214D1 (D1 = greasable)." }, { "q": "How is UCP214 locked to the shaft, and how tight should the setscrews be?", "a": "The UC214D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP214 instead of a flanged unit?", "a": "Choose the UCP214 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 79.4 mm above the 266 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP214 bearing self-aligning?", "a": "Yes within limits. The UC214D1 insert has a spherical outer diameter that pivots in the P214 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP214 mounted bearing?", "a": "UCP214 takes a 70 mm shaft (insert UC214D1, 125 mm OD) and has a unit mass of about 6.5 kg. Housing figures: centre height H 79.4 mm, length L 266 mm, bolt centres J 210 mm, foot holes 25 mm for M20 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX14", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 70, "D_mm": 150, "B_mm": 77.8, "seal_type": "2RS", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "weight_g": 9300, "housing_height_mm": 88.9, "base_length_mm": 330, "bolt_spacing_mm": 229, "bolt_size_mm": 27, "manufacturer_designation": "UCPX14", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX14" ], "naming_rule_text": "UCPX14 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UCX14D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series X, bore code ending in the 70 mm shaft size; the unit is built from insert UCX14D1 and housing PX14. For layout work on UCPX14: the 70 mm shaft centre sits 88.9 mm above the sole (H), the footprint is 330 mm long (L), bolt centres are 229 mm (J), and the foot holes suit M22 (27 mm) bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UCX14D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCPX14 weighs about 9.3 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The X insert of UCPX14 is wider and rated above the 2-series part at 70 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX14 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.", "When ordering covers for UCPX14, note the steel and cast-iron cover executions change the unit mass and envelope but not the 229 mm mounting centres.", "At 70 mm bore the 330 mm base of UCPX14 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCPX14 mounted bearing?", "a": "UCPX14 takes a 70 mm shaft (insert UCX14D1, 150 mm OD) and has a unit mass of about 9.3 kg. Housing figures: centre height H 88.9 mm, length L 330 mm, bolt centres J 229 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX14 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 70 mm bore. UCPX14 is built from housing PX14 plus insert UCX14D1 (D1 = greasable)." }, { "q": "How is UCPX14 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX14D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX14 instead of a flanged unit?", "a": "Choose the UCPX14 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX14", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP314", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 70, "D_mm": 150, "B_mm": 78, "seal_type": "2RS", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "weight_g": 12000, "housing_height_mm": 95, "base_length_mm": 360, "bolt_spacing_mm": 280, "bolt_size_mm": 27, "manufacturer_designation": "UCP314", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP314" ], "naming_rule_text": "UCP314 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC314D1) pre-assembled in a P314 two-bolt plummer housing. On the nameplate, UCP314 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 70 mm bore; the UC314D1 designation shows the D1 greasable execution. Boundary data for the 70 mm bore: housing centre height 95 mm, base 360 mm, mounting centres 280 mm for M22 fasteners through 27 mm holes; the UC314D1 insert itself is 150 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC314D1 insert are 115 kN dynamic and 68 kN static; the assembled UCP314 weighs about 12.0 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the P314 housing of UCP314: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "At 70 mm bore the 360 mm base of UCP314 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCP314 the highest-rated unit at 70 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP314 needs a prepared horizontal surface at the 95 mm centre height: shim both feet with full-width packs so the 360 mm base seats over its full area." ], "faq": [ { "q": "How is UCP314 locked to the shaft, and how tight should the setscrews be?", "a": "The UC314D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP314 instead of a flanged unit?", "a": "Choose the UCP314 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 95 mm above the 360 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP314 mounted bearing?", "a": "UCP314 takes a 70 mm shaft (insert UC314D1, 150 mm OD) and has a unit mass of about 12.0 kg. Housing figures: centre height H 95 mm, length L 360 mm, bolt centres J 280 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP314 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 70 mm bore. UCP314 is built from housing P314 plus insert UC314D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP215", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 75, "D_mm": 130, "B_mm": 77.8, "seal_type": "2RS", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "weight_g": 7200, "housing_height_mm": 82.6, "base_length_mm": 275, "bolt_spacing_mm": 217, "bolt_size_mm": 25, "manufacturer_designation": "UCP215", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP215" ], "naming_rule_text": "UCP215 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC215D1) pre-assembled in a P215 two-bolt plummer housing. On the nameplate, UCP215 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 75 mm bore; the UC215D1 designation shows the D1 greasable execution. Boundary data for the 75 mm bore: housing centre height 82.6 mm, base 275 mm, mounting centres 217 mm for M20 fasteners through 25 mm holes; the UC215D1 insert itself is 130 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC215D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCP215 weighs about 7.2 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the P215 housing of UCP215: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Heavy drives on UCP215 should have the setscrews re-torqued after the first day; at 75 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCP215 is the lightest section at 75 mm — do not substitute it into a position that previously ran an X or 3 unit: the 217 mm mounting may match while the load rating does not.", "As a pillow block, UCP215 needs a prepared horizontal surface at the 82.6 mm centre height: shim both feet with full-width packs so the 275 mm base seats over its full area." ], "faq": [ { "q": "How is UCP215 locked to the shaft, and how tight should the setscrews be?", "a": "The UC215D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP215 instead of a flanged unit?", "a": "Choose the UCP215 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 82.6 mm above the 275 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP215 mounted bearing?", "a": "UCP215 takes a 75 mm shaft (insert UC215D1, 130 mm OD) and has a unit mass of about 7.2 kg. Housing figures: centre height H 82.6 mm, length L 275 mm, bolt centres J 217 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP215 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 75 mm bore. UCP215 is built from housing P215 plus insert UC215D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX15", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 75, "D_mm": 160, "B_mm": 82.6, "seal_type": "2RS", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "weight_g": 10000, "housing_height_mm": 88.9, "base_length_mm": 330, "bolt_spacing_mm": 229, "bolt_size_mm": 27, "manufacturer_designation": "UCPX15", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX15" ], "naming_rule_text": "A 75 mm bore upright mounted bearing, NTN UCPX15 combines the UCX15D1 self-aligning insert with the grey-iron PX15 pillow block base. NTN's numbering ties the unit to its components: UCPX15 means the PX15 housing carrying the UCX15D1 insert, with the last two digits denoting the 75 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 88.9 mm centre height, L 330 mm total length, J 229 mm between the 27 mm bolt holes, and a 75 mm shaft passing through the 160 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UCX15D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCPX15 weighs about 10.0 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCPX15 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.", "The D1 suffix on UCX15D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCPX15 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UCX15D1 insert of UCPX15 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCPX15 at 75 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 88.9 mm centre height and binds the insert.", "The X insert of UCPX15 is wider and rated above the 2-series part at 75 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping." ], "faq": [ { "q": "What does the UCPX15 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 75 mm bore. UCPX15 is built from housing PX15 plus insert UCX15D1 (D1 = greasable)." }, { "q": "How is UCPX15 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX15D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX15 instead of a flanged unit?", "a": "Choose the UCPX15 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCPX15 bearing self-aligning?", "a": "Yes within limits. The UCX15D1 insert has a spherical outer diameter that pivots in the PX15 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCPX15 mounted bearing?", "a": "UCPX15 takes a 75 mm shaft (insert UCX15D1, 160 mm OD) and has a unit mass of about 10.0 kg. Housing figures: centre height H 88.9 mm, length L 330 mm, bolt centres J 229 mm, foot holes 27 mm for M22 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX15", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP315", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 75, "D_mm": 160, "B_mm": 82, "seal_type": "2RS", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "weight_g": 14000, "housing_height_mm": 100, "base_length_mm": 380, "bolt_spacing_mm": 290, "bolt_size_mm": 27, "manufacturer_designation": "UCP315", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP315" ], "naming_rule_text": "The NTN UCP315 unit pairs a UC315D1 sealed ball bearing insert with a one-piece P315 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP315 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 75 mm; P315 and UC315D1 are the separate housing and insert part numbers inside. Shaft size is 75 mm; the cast base stands 100 mm to the shaft centre (H), is 380 mm long overall (L), and the two foundation holes on 290 mm centres (J) clear 27 mm M22 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC315D1 insert are 126 kN dynamic and 77 kN static; the assembled UCP315 weighs about 14.0 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "UCP315 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 75 mm journal over time.", "UCP315 at 75 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 100 mm centre height and binds the insert.", "The 3-series insert makes UCP315 the highest-rated unit at 75 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP315 needs a prepared horizontal surface at the 100 mm centre height: shim both feet with full-width packs so the 380 mm base seats over its full area.", "At replacement time, measure the 75 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP315 creep identically to the old one." ], "faq": [ { "q": "When should I choose a pillow block like UCP315 instead of a flanged unit?", "a": "Choose the UCP315 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 100 mm above the 380 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP315 unit carry?", "a": "The UC315D1 insert is rated at 126 kN dynamic and 77 kN basic static (fatigue load limit 5.55 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP315 mounted bearing?", "a": "UCP315 takes a 75 mm shaft (insert UC315D1, 160 mm OD) and has a unit mass of about 14.0 kg. Housing figures: centre height H 100 mm, length L 380 mm, bolt centres J 290 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP315 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 75 mm bore. UCP315 is built from housing P315 plus insert UC315D1 (D1 = greasable)." }, { "q": "How is UCP315 locked to the shaft, and how tight should the setscrews be?", "a": "The UC315D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP216", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 80, "D_mm": 140, "B_mm": 82.6, "seal_type": "2RS", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "weight_g": 8700, "housing_height_mm": 88.9, "base_length_mm": 292, "bolt_spacing_mm": 232, "bolt_size_mm": 25, "manufacturer_designation": "UCP216", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP216" ], "naming_rule_text": "The NTN UCP216 unit pairs a UC216D1 sealed ball bearing insert with a one-piece P216 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP216 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 80 mm; P216 and UC216D1 are the separate housing and insert part numbers inside. Shaft size is 80 mm; the cast base stands 88.9 mm to the shaft centre (H), is 292 mm long overall (L), and the two foundation holes on 232 mm centres (J) clear 25 mm M20 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC216D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCP216 weighs about 8.7 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "UCP216 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 80 mm journal over time.", "At 80 mm bore the 292 mm base of UCP216 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The standard 2-series insert in UCP216 is the lightest section at 80 mm — do not substitute it into a position that previously ran an X or 3 unit: the 232 mm mounting may match while the load rating does not.", "As a pillow block, UCP216 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 292 mm base seats over its full area.", "At replacement time, measure the 80 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP216 creep identically to the old one." ], "faq": [ { "q": "When should I choose a pillow block like UCP216 instead of a flanged unit?", "a": "Choose the UCP216 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 292 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP216 unit carry?", "a": "The UC216D1 insert is rated at 80.5 kN dynamic and 53 kN basic static (fatigue load limit 3.95 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP216 mounted bearing?", "a": "UCP216 takes a 80 mm shaft (insert UC216D1, 140 mm OD) and has a unit mass of about 8.7 kg. Housing figures: centre height H 88.9 mm, length L 292 mm, bolt centres J 232 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP216 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 80 mm bore. UCP216 is built from housing P216 plus insert UC216D1 (D1 = greasable)." }, { "q": "How is UCP216 locked to the shaft, and how tight should the setscrews be?", "a": "The UC216D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX16", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 80, "D_mm": 170, "B_mm": 85.7, "seal_type": "2RS", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "weight_g": 14000, "housing_height_mm": 101.6, "base_length_mm": 381, "bolt_spacing_mm": 283, "bolt_size_mm": 27, "manufacturer_designation": "UCPX16", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX16" ], "naming_rule_text": "UCPX16 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX16D1) pre-assembled in a PX16 two-bolt plummer housing. On the nameplate, UCPX16 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 80 mm bore; the UCX16D1 designation shows the D1 greasable execution. Boundary data for the 80 mm bore: housing centre height 101.6 mm, base 381 mm, mounting centres 283 mm for M22 fasteners through 27 mm holes; the UCX16D1 insert itself is 170 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UCX16D1 insert are 92 kN dynamic and 64 kN static; the assembled UCPX16 weighs about 14.0 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the PX16 housing of UCPX16: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Heavy drives on UCPX16 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The X insert of UCPX16 is wider and rated above the 2-series part at 80 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX16 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX16 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX16D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX16 instead of a flanged unit?", "a": "Choose the UCPX16 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCPX16 mounted bearing?", "a": "UCPX16 takes a 80 mm shaft (insert UCX16D1, 170 mm OD) and has a unit mass of about 14.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX16 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 80 mm bore. UCPX16 is built from housing PX16 plus insert UCX16D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX16", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP316", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 80, "D_mm": 170, "B_mm": 86, "seal_type": "2RS", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "weight_g": 17000, "housing_height_mm": 106, "base_length_mm": 400, "bolt_spacing_mm": 300, "bolt_size_mm": 27, "manufacturer_designation": "UCP316", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP316" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP316 is the classic upright pillow block for a 80 mm shaft: insert UC316D1, housing P316, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 80 mm bore. Key mounting figures: centre height H = 106 mm, overall base length L = 400 mm, bolt-hole spacing J = 300 mm, and each of the two feet takes a 27 mm (M22) fastener for the 80 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC316D1 insert are 136 kN dynamic and 86.5 kN static; the assembled UCP316 weighs about 17.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The 3-series insert makes UCP316 the highest-rated unit at 80 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP316 needs a prepared horizontal surface at the 106 mm centre height: shim both feet with full-width packs so the 400 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UC316D1 insert of UCP316 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "Heavy drives on UCP316 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks." ], "faq": [ { "q": "What are the dimensions of an UCP316 mounted bearing?", "a": "UCP316 takes a 80 mm shaft (insert UC316D1, 170 mm OD) and has a unit mass of about 17.0 kg. Housing figures: centre height H 106 mm, length L 400 mm, bolt centres J 300 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP316 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 80 mm bore. UCP316 is built from housing P316 plus insert UC316D1 (D1 = greasable)." }, { "q": "How is UCP316 locked to the shaft, and how tight should the setscrews be?", "a": "The UC316D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP316 instead of a flanged unit?", "a": "Choose the UCP316 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 106 mm above the 400 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP217", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 85, "D_mm": 150, "B_mm": 85.7, "seal_type": "2RS", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "weight_g": 11000, "housing_height_mm": 95.2, "base_length_mm": 310, "bolt_spacing_mm": 247, "bolt_size_mm": 25, "manufacturer_designation": "UCP217", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP217" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP217 is the classic upright pillow block for a 85 mm shaft: insert UC217D1, housing P217, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 85 mm bore. Key mounting figures: centre height H = 95.2 mm, overall base length L = 310 mm, bolt-hole spacing J = 247 mm, and each of the two feet takes a 25 mm (M20) fastener for the 85 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC217D1 insert are 92 kN dynamic and 64 kN static; the assembled UCP217 weighs about 11.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The standard 2-series insert in UCP217 is the lightest section at 85 mm — do not substitute it into a position that previously ran an X or 3 unit: the 247 mm mounting may match while the load rating does not.", "As a pillow block, UCP217 needs a prepared horizontal surface at the 95.2 mm centre height: shim both feet with full-width packs so the 310 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UC217D1 insert of UCP217 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCP217 at 85 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 95.2 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCP217 mounted bearing?", "a": "UCP217 takes a 85 mm shaft (insert UC217D1, 150 mm OD) and has a unit mass of about 11.0 kg. Housing figures: centre height H 95.2 mm, length L 310 mm, bolt centres J 247 mm, foot holes 25 mm for M20 bolts." }, { "q": "What does the UCP217 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 85 mm bore. UCP217 is built from housing P217 plus insert UC217D1 (D1 = greasable)." }, { "q": "How is UCP217 locked to the shaft, and how tight should the setscrews be?", "a": "The UC217D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP217 instead of a flanged unit?", "a": "Choose the UCP217 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 95.2 mm above the 310 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX17", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 85, "D_mm": 180, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "weight_g": 15000, "housing_height_mm": 101.6, "base_length_mm": 381, "bolt_spacing_mm": 283, "bolt_size_mm": 27, "manufacturer_designation": "UCPX17", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX17" ], "naming_rule_text": "The NTN UCPX17 unit pairs a UCX17D1 sealed ball bearing insert with a one-piece PX17 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCPX17 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 85 mm; PX17 and UCX17D1 are the separate housing and insert part numbers inside. Shaft size is 85 mm; the cast base stands 101.6 mm to the shaft centre (H), is 381 mm long overall (L), and the two foundation holes on 283 mm centres (J) clear 27 mm M22 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UCX17D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCPX17 weighs about 15.0 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "UCPX17 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 85 mm journal over time.", "At 85 mm bore the 381 mm base of UCPX17 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The X insert of UCPX17 is wider and rated above the 2-series part at 85 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX17 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area.", "At replacement time, measure the 85 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX17 creep identically to the old one." ], "faq": [ { "q": "When should I choose a pillow block like UCPX17 instead of a flanged unit?", "a": "Choose the UCPX17 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCPX17 unit carry?", "a": "The UCX17D1 insert is rated at 106 kN dynamic and 71.5 kN basic static (fatigue load limit 5 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCPX17 mounted bearing?", "a": "UCPX17 takes a 85 mm shaft (insert UCX17D1, 180 mm OD) and has a unit mass of about 15.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX17 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 85 mm bore. UCPX17 is built from housing PX17 plus insert UCX17D1 (D1 = greasable)." }, { "q": "How is UCPX17 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX17D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX17", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP317", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 85, "D_mm": 180, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "weight_g": 19000, "housing_height_mm": 112, "base_length_mm": 420, "bolt_spacing_mm": 320, "bolt_size_mm": 33, "manufacturer_designation": "UCP317", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP317" ], "naming_rule_text": "NTN ships the UCP317 as a matched assembly — UC317D1 insert swaged into the P317 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 85 mm shaft size; the unit is built from insert UC317D1 and housing P317. For layout work on UCP317: the 85 mm shaft centre sits 112 mm above the sole (H), the footprint is 420 mm long (L), bolt centres are 320 mm (J), and the foot holes suit M27 (33 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC317D1 insert are 147 kN dynamic and 97 kN static; the assembled UCP317 weighs about 19.0 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCP317 the highest-rated unit at 85 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP317 needs a prepared horizontal surface at the 112 mm centre height: shim both feet with full-width packs so the 420 mm base seats over its full area.", "Do not confuse UCP317 with a bare UC317D1 bearing: replacing only the insert is possible, but the housing P317 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP317, note the steel and cast-iron cover executions change the unit mass and envelope but not the 320 mm mounting centres.", "At 85 mm bore the 420 mm base of UCP317 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCP317 mounted bearing?", "a": "UCP317 takes a 85 mm shaft (insert UC317D1, 180 mm OD) and has a unit mass of about 19.0 kg. Housing figures: centre height H 112 mm, length L 420 mm, bolt centres J 320 mm, foot holes 33 mm for M27 bolts." }, { "q": "What does the UCP317 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 85 mm bore. UCP317 is built from housing P317 plus insert UC317D1 (D1 = greasable)." }, { "q": "How is UCP317 locked to the shaft, and how tight should the setscrews be?", "a": "The UC317D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP317 instead of a flanged unit?", "a": "Choose the UCP317 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 112 mm above the 420 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP317 unit?", "a": "There is no single interval for UCP317: the UC317D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP218", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 90, "D_mm": 160, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "weight_g": 13000, "housing_height_mm": 101.6, "base_length_mm": 327, "bolt_spacing_mm": 262, "bolt_size_mm": 27, "manufacturer_designation": "UCP218", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP218" ], "naming_rule_text": "NTN ships the UCP218 as a matched assembly — UC218D1 insert swaged into the P218 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 90 mm shaft size; the unit is built from insert UC218D1 and housing P218. For layout work on UCP218: the 90 mm shaft centre sits 101.6 mm above the sole (H), the footprint is 327 mm long (L), bolt centres are 262 mm (J), and the foot holes suit M22 (27 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC218D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCP218 weighs about 13.0 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCP218 is the lightest section at 90 mm — do not substitute it into a position that previously ran an X or 3 unit: the 262 mm mounting may match while the load rating does not.", "As a pillow block, UCP218 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 327 mm base seats over its full area.", "Do not confuse UCP218 with a bare UC218D1 bearing: replacing only the insert is possible, but the housing P218 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP218, note the steel and cast-iron cover executions change the unit mass and envelope but not the 262 mm mounting centres.", "Heavy drives on UCP218 should have the setscrews re-torqued after the first day; at 90 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks." ], "faq": [ { "q": "What are the dimensions of an UCP218 mounted bearing?", "a": "UCP218 takes a 90 mm shaft (insert UC218D1, 160 mm OD) and has a unit mass of about 13.0 kg. Housing figures: centre height H 101.6 mm, length L 327 mm, bolt centres J 262 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCP218 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 90 mm bore. UCP218 is built from housing P218 plus insert UC218D1 (D1 = greasable)." }, { "q": "How is UCP218 locked to the shaft, and how tight should the setscrews be?", "a": "The UC218D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP218 instead of a flanged unit?", "a": "Choose the UCP218 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 327 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP218 unit?", "a": "There is no single interval for UCP218: the UC218D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX18", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 90, "D_mm": 190, "B_mm": 104, "seal_type": "2RS", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "weight_g": 16000, "housing_height_mm": 101.6, "base_length_mm": 381, "bolt_spacing_mm": 283, "bolt_size_mm": 27, "manufacturer_designation": "UCPX18", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX18" ], "naming_rule_text": "In NTN's mounted-ball-bearing range, UCPX18 is the classic upright pillow block for a 90 mm shaft: insert UCX18D1, housing PX18, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 90 mm bore. Key mounting figures: centre height H = 101.6 mm, overall base length L = 381 mm, bolt-hole spacing J = 283 mm, and each of the two feet takes a 27 mm (M22) fastener for the 90 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UCX18D1 insert are 121 kN dynamic and 82 kN static; the assembled UCPX18 weighs about 16.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The X insert of UCPX18 is wider and rated above the 2-series part at 90 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX18 needs a prepared horizontal surface at the 101.6 mm centre height: shim both feet with full-width packs so the 381 mm base seats over its full area.", "Self-aligning is not the same as free to move: the UCX18D1 insert of UCPX18 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCPX18 at 90 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 101.6 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCPX18 mounted bearing?", "a": "UCPX18 takes a 90 mm shaft (insert UCX18D1, 190 mm OD) and has a unit mass of about 16.0 kg. Housing figures: centre height H 101.6 mm, length L 381 mm, bolt centres J 283 mm, foot holes 27 mm for M22 bolts." }, { "q": "What does the UCPX18 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 90 mm bore. UCPX18 is built from housing PX18 plus insert UCX18D1 (D1 = greasable)." }, { "q": "How is UCPX18 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX18D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX18 instead of a flanged unit?", "a": "Choose the UCPX18 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 101.6 mm above the 381 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX18", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP318", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 90, "D_mm": 190, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "weight_g": 22000, "housing_height_mm": 118, "base_length_mm": 430, "bolt_spacing_mm": 330, "bolt_size_mm": 33, "manufacturer_designation": "UCP318", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP318" ], "naming_rule_text": "UCP318 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC318D1 insert. NTN's numbering ties the unit to its components: UCP318 means the P318 housing carrying the UC318D1 insert, with the last two digits denoting the 90 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 118 mm centre height, L 430 mm total length, J 330 mm between the 33 mm bolt holes, and a 90 mm shaft passing through the 190 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC318D1 insert are 158 kN dynamic and 107 kN static; the assembled UCP318 weighs about 22.0 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "UCP318 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 90 mm journal over time.", "UCP318 at 90 mm uses M27 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 118 mm centre height and binds the insert.", "The 3-series insert makes UCP318 the highest-rated unit at 90 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP318 needs a prepared horizontal surface at the 118 mm centre height: shim both feet with full-width packs so the 430 mm base seats over its full area." ], "faq": [ { "q": "How is UCP318 locked to the shaft, and how tight should the setscrews be?", "a": "The UC318D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP318 instead of a flanged unit?", "a": "Choose the UCP318 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 118 mm above the 430 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP318 mounted bearing?", "a": "UCP318 takes a 90 mm shaft (insert UC318D1, 190 mm OD) and has a unit mass of about 22.0 kg. Housing figures: centre height H 118 mm, length L 430 mm, bolt centres J 330 mm, foot holes 33 mm for M27 bolts." }, { "q": "What does the UCP318 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 90 mm bore. UCP318 is built from housing P318 plus insert UC318D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP319", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 95, "D_mm": 200, "B_mm": 103, "seal_type": "2RS", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "weight_g": 26000, "housing_height_mm": 125, "base_length_mm": 470, "bolt_spacing_mm": 360, "bolt_size_mm": 36, "manufacturer_designation": "UCP319", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP319" ], "naming_rule_text": "A 95 mm bore upright mounted bearing, NTN UCP319 combines the UC319D1 self-aligning insert with the grey-iron P319 pillow block base. On the nameplate, UCP319 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 95 mm bore; the UC319D1 designation shows the D1 greasable execution. Boundary data for the 95 mm bore: housing centre height 125 mm, base 470 mm, mounting centres 360 mm for M30 fasteners through 36 mm holes; the UC319D1 insert itself is 200 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC319D1 insert are 169 kN dynamic and 119 kN static; the assembled UCP319 weighs about 26.0 kg.", "applications": [ "ship-loader and stacker drives", "mining and port conveyor pulleys", "primary crusher feeders", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The lip seals and slingers on UCP319 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P319 housing of UCP319: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Foundation design for UCP319 must resist the belt-pull reaction at 125 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCP319 the highest-rated unit at 95 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP319 needs a prepared horizontal surface at the 125 mm centre height: shim both feet with full-width packs so the 470 mm base seats over its full area." ], "faq": [ { "q": "How is UCP319 locked to the shaft, and how tight should the setscrews be?", "a": "The UC319D1 insert uses two collar setscrews on the 95 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP319 instead of a flanged unit?", "a": "Choose the UCP319 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 125 mm above the 470 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCP319 unit?", "a": "Yes — UCP319 is an assembly of the P319 housing and UC319D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 95 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCP319 mounted bearing?", "a": "UCP319 takes a 95 mm shaft (insert UC319D1, 200 mm OD) and has a unit mass of about 26.0 kg. Housing figures: centre height H 125 mm, length L 470 mm, bolt centres J 360 mm, foot holes 36 mm for M30 bolts." }, { "q": "What does the UCP319 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 95 mm bore. UCP319 is built from housing P319 plus insert UC319D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP320", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 100, "D_mm": 215, "B_mm": 108, "seal_type": "2RS", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "weight_g": 33000, "housing_height_mm": 140, "base_length_mm": 490, "bolt_spacing_mm": 380, "bolt_size_mm": 36, "manufacturer_designation": "UCP320", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP320" ], "naming_rule_text": "NTN ships the UCP320 as a matched assembly — UC320D1 insert swaged into the P320 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 100 mm bore. Key mounting figures: centre height H = 140 mm, overall base length L = 490 mm, bolt-hole spacing J = 380 mm, and each of the two feet takes a 36 mm (M30) fastener for the 100 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC320D1 insert are 192 kN dynamic and 141 kN static; the assembled UCP320 weighs about 33.0 kg.", "applications": [ "large induced-draft fans", "quarry and aggregate screens", "ship-loader and stacker drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 100 mm bore, rigging and alignment dominate the UCP320 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.", "The 3-series insert makes UCP320 the highest-rated unit at 100 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP320 needs a prepared horizontal surface at the 140 mm centre height: shim both feet with full-width packs so the 490 mm base seats over its full area.", "Do not confuse UCP320 with a bare UC320D1 bearing: replacing only the insert is possible, but the housing P320 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP320, note the steel and cast-iron cover executions change the unit mass and envelope but not the 380 mm mounting centres." ], "faq": [ { "q": "Does UCP320 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 380 mm bolt centres of UCP320 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCP320 mounted bearing?", "a": "UCP320 takes a 100 mm shaft (insert UC320D1, 215 mm OD) and has a unit mass of about 33.0 kg. Housing figures: centre height H 140 mm, length L 490 mm, bolt centres J 380 mm, foot holes 36 mm for M30 bolts." }, { "q": "What does the UCP320 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 100 mm bore. UCP320 is built from housing P320 plus insert UC320D1 (D1 = greasable)." }, { "q": "How is UCP320 locked to the shaft, and how tight should the setscrews be?", "a": "The UC320D1 insert uses two collar setscrews on the 100 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP320 instead of a flanged unit?", "a": "Choose the UCP320 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 140 mm above the 490 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP320", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCPX20", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 100, "D_mm": 215, "B_mm": 117.5, "seal_type": "2RS", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "weight_g": 25000, "housing_height_mm": 127, "base_length_mm": 432, "bolt_spacing_mm": 337, "bolt_size_mm": 33, "manufacturer_designation": "UCPX20", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCPX20" ], "naming_rule_text": "The NTN UCPX20 unit pairs a UCX20D1 sealed ball bearing insert with a one-piece PX20 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCPX20 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 100 mm bore; the UCX20D1 designation shows the D1 greasable execution. Boundary data for the 100 mm bore: housing centre height 127 mm, base 432 mm, mounting centres 337 mm for M27 fasteners through 33 mm holes; the UCX20D1 insert itself is 215 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UCX20D1 insert are 147 kN dynamic and 105 kN static; the assembled UCPX20 weighs about 25.0 kg.", "applications": [ "primary crusher feeders", "steel-plant roller tables", "large induced-draft fans", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "At replacement time, measure the 100 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX20 creep identically to the old one.", "UCPX20 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 100 mm journal over time.", "At 100 mm bore, rigging and alignment dominate the UCPX20 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.", "The X insert of UCPX20 is wider and rated above the 2-series part at 100 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a pillow block, UCPX20 needs a prepared horizontal surface at the 127 mm centre height: shim both feet with full-width packs so the 432 mm base seats over its full area." ], "faq": [ { "q": "How is UCPX20 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX20D1 insert uses two collar setscrews on the 100 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCPX20 instead of a flanged unit?", "a": "Choose the UCPX20 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 127 mm above the 432 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCPX20 unit?", "a": "Yes — UCPX20 is an assembly of the PX20 housing and UCX20D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 100 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCPX20 mounted bearing?", "a": "UCPX20 takes a 100 mm shaft (insert UCX20D1, 215 mm OD) and has a unit mass of about 25.0 kg. Housing figures: centre height H 127 mm, length L 432 mm, bolt centres J 337 mm, foot holes 33 mm for M27 bolts." }, { "q": "What does the UCPX20 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 100 mm bore. UCPX20 is built from housing PX20 plus insert UCX20D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCPX20", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP321", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 105, "D_mm": 225, "B_mm": 112, "seal_type": "2RS", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "weight_g": 35000, "housing_height_mm": 140, "base_length_mm": 490, "bolt_spacing_mm": 380, "bolt_size_mm": 36, "manufacturer_designation": "UCP321", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP321" ], "naming_rule_text": "UCP321 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC321D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 105 mm shaft size; the unit is built from insert UC321D1 and housing P321. For layout work on UCP321: the 105 mm shaft centre sits 140 mm above the sole (H), the footprint is 490 mm long (L), bolt centres are 380 mm (J), and the foot holes suit M30 (36 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC321D1 insert are 204 kN dynamic and 153 kN static; the assembled UCP321 weighs about 35.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "UCP321 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 105 mm journal over time.", "XL units like UCP321 (105 mm bore, M30 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCP321 the highest-rated unit at 105 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP321 needs a prepared horizontal surface at the 140 mm centre height: shim both feet with full-width packs so the 490 mm base seats over its full area." ], "faq": [ { "q": "How is UCP321 locked to the shaft, and how tight should the setscrews be?", "a": "The UC321D1 insert uses two collar setscrews on the 105 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP321 instead of a flanged unit?", "a": "Choose the UCP321 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 140 mm above the 490 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What are the dimensions of an UCP321 mounted bearing?", "a": "UCP321 takes a 105 mm shaft (insert UC321D1, 225 mm OD) and has a unit mass of about 35.0 kg. Housing figures: centre height H 140 mm, length L 490 mm, bolt centres J 380 mm, foot holes 36 mm for M30 bolts." }, { "q": "What does the UCP321 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 105 mm bore. UCP321 is built from housing P321 plus insert UC321D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP321", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP322", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 110, "D_mm": 240, "B_mm": 117, "seal_type": "2RS", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "weight_g": 43000, "housing_height_mm": 150, "base_length_mm": 520, "bolt_spacing_mm": 400, "bolt_size_mm": 40, "manufacturer_designation": "UCP322", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP322" ], "naming_rule_text": "A 110 mm bore upright mounted bearing, NTN UCP322 combines the UC322D1 self-aligning insert with the grey-iron P322 pillow block base. NTN's numbering ties the unit to its components: UCP322 means the P322 housing carrying the UC322D1 insert, with the last two digits denoting the 110 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 150 mm centre height, L 520 mm total length, J 400 mm between the 40 mm bolt holes, and a 110 mm shaft passing through the 240 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC322D1 insert are 227 kN dynamic and 179 kN static; the assembled UCP322 weighs about 43.0 kg.", "applications": [ "ship-loader and stacker drives", "mining and port conveyor pulleys", "primary crusher feeders", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a pillow block, UCP322 needs a prepared horizontal surface at the 150 mm centre height: shim both feet with full-width packs so the 520 mm base seats over its full area.", "The lip seals and slingers on UCP322 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the P322 housing of UCP322: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Foundation design for UCP322 must resist the belt-pull reaction at 150 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCP322 the highest-rated unit at 110 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCP322 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 110 mm bore. UCP322 is built from housing P322 plus insert UC322D1 (D1 = greasable)." }, { "q": "How is UCP322 locked to the shaft, and how tight should the setscrews be?", "a": "The UC322D1 insert uses two collar setscrews on the 110 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP322 instead of a flanged unit?", "a": "Choose the UCP322 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 150 mm above the 520 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Is the UCP322 bearing self-aligning?", "a": "Yes within limits. The UC322D1 insert has a spherical outer diameter that pivots in the P322 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCP322 mounted bearing?", "a": "UCP322 takes a 110 mm shaft (insert UC322D1, 240 mm OD) and has a unit mass of about 43.0 kg. Housing figures: centre height H 150 mm, length L 520 mm, bolt centres J 400 mm, foot holes 40 mm for M33 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP322", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP324", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 120, "D_mm": 260, "B_mm": 126, "seal_type": "2RS", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "weight_g": 50000, "housing_height_mm": 160, "base_length_mm": 570, "bolt_spacing_mm": 450, "bolt_size_mm": 40, "manufacturer_designation": "UCP324", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP324" ], "naming_rule_text": "The NTN UCP324 unit pairs a UC324D1 sealed ball bearing insert with a one-piece P324 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP324 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 120 mm; P324 and UC324D1 are the separate housing and insert part numbers inside. Shaft size is 120 mm; the cast base stands 160 mm to the shaft centre (H), is 570 mm long overall (L), and the two foundation holes on 450 mm centres (J) clear 40 mm M33 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC324D1 insert are 229 kN dynamic and 185 kN static; the assembled UCP324 weighs about 50.0 kg.", "applications": [ "primary crusher feeders", "steel-plant roller tables", "large induced-draft fans", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Self-aligning is not the same as free to move: the UC324D1 insert of UCP324 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "XL units like UCP324 (120 mm bore, M33 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCP324 the highest-rated unit at 120 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP324 needs a prepared horizontal surface at the 160 mm centre height: shim both feet with full-width packs so the 570 mm base seats over its full area.", "The D1 suffix on UC324D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP324 on site accepts relubrication." ], "faq": [ { "q": "When should I choose a pillow block like UCP324 instead of a flanged unit?", "a": "Choose the UCP324 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 160 mm above the 570 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "What loads can the UCP324 unit carry?", "a": "The UC324D1 insert is rated at 229 kN dynamic and 185 kN basic static (fatigue load limit 10.5 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCP324 mounted bearing?", "a": "UCP324 takes a 120 mm shaft (insert UC324D1, 260 mm OD) and has a unit mass of about 50.0 kg. Housing figures: centre height H 160 mm, length L 570 mm, bolt centres J 450 mm, foot holes 40 mm for M33 bolts." }, { "q": "What does the UCP324 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 120 mm bore. UCP324 is built from housing P324 plus insert UC324D1 (D1 = greasable)." }, { "q": "How is UCP324 locked to the shaft, and how tight should the setscrews be?", "a": "The UC324D1 insert uses two collar setscrews on the 120 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP326", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 130, "D_mm": 280, "B_mm": 135, "seal_type": "2RS", "dynamic_load_kN": 254, "static_load_kN": 214, "fatigue_load_limit_kN": 11.7, "weight_g": 69000, "housing_height_mm": 180, "base_length_mm": 600, "bolt_spacing_mm": 480, "bolt_size_mm": 40, "manufacturer_designation": "UCP326", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP326" ], "naming_rule_text": "NTN ships the UCP326 as a matched assembly — UC326D1 insert swaged into the P326 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 130 mm shaft size; the unit is built from insert UC326D1 and housing P326. For layout work on UCP326: the 130 mm shaft centre sits 180 mm above the sole (H), the footprint is 600 mm long (L), bolt centres are 480 mm (J), and the foot holes suit M33 (40 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC326D1 insert are 254 kN dynamic and 214 kN static; the assembled UCP326 weighs about 69.0 kg.", "applications": [ "large induced-draft fans", "quarry and aggregate screens", "ship-loader and stacker drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCP326 the highest-rated unit at 130 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP326 needs a prepared horizontal surface at the 180 mm centre height: shim both feet with full-width packs so the 600 mm base seats over its full area.", "At replacement time, measure the 130 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP326 creep identically to the old one.", "UCP326 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 130 mm journal over time.", "At 130 mm bore, rigging and alignment dominate the UCP326 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted." ], "faq": [ { "q": "What are the dimensions of an UCP326 mounted bearing?", "a": "UCP326 takes a 130 mm shaft (insert UC326D1, 280 mm OD) and has a unit mass of about 69.0 kg. Housing figures: centre height H 180 mm, length L 600 mm, bolt centres J 480 mm, foot holes 40 mm for M33 bolts." }, { "q": "What does the UCP326 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 130 mm bore. UCP326 is built from housing P326 plus insert UC326D1 (D1 = greasable)." }, { "q": "How is UCP326 locked to the shaft, and how tight should the setscrews be?", "a": "The UC326D1 insert uses two collar setscrews on the 130 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP326 instead of a flanged unit?", "a": "Choose the UCP326 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 180 mm above the 600 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "How often should I relubricate an UCP326 unit?", "a": "There is no single interval for UCP326: the UC326D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP326", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCP328", "brand": "NTN", "series": "UCP-series", "type": "pillow_block", "d_mm": 140, "D_mm": 300, "B_mm": 145, "seal_type": "2RS", "dynamic_load_kN": 280, "static_load_kN": 246, "fatigue_load_limit_kN": 13, "weight_g": 84000, "housing_height_mm": 200, "base_length_mm": 620, "bolt_spacing_mm": 500, "bolt_size_mm": 40, "manufacturer_designation": "UCP328", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCP328" ], "naming_rule_text": "A 140 mm bore upright mounted bearing, NTN UCP328 combines the UC328D1 self-aligning insert with the grey-iron P328 pillow block base. On the nameplate, UCP328 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 140 mm bore; the UC328D1 designation shows the D1 greasable execution. Boundary data for the 140 mm bore: housing centre height 200 mm, base 620 mm, mounting centres 500 mm for M33 fasteners through 40 mm holes; the UC328D1 insert itself is 300 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC328D1 insert are 280 kN dynamic and 246 kN static; the assembled UCP328 weighs about 84.0 kg.", "applications": [ "ship-loader and stacker drives", "mining and port conveyor pulleys", "primary crusher feeders", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "Do not confuse UCP328 with a bare UC328D1 bearing: replacing only the insert is possible, but the housing P328 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCP328, note the steel and cast-iron cover executions change the unit mass and envelope but not the 500 mm mounting centres.", "Foundation design for UCP328 must resist the belt-pull reaction at 200 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCP328 the highest-rated unit at 140 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a pillow block, UCP328 needs a prepared horizontal surface at the 200 mm centre height: shim both feet with full-width packs so the 620 mm base seats over its full area." ], "faq": [ { "q": "How is UCP328 locked to the shaft, and how tight should the setscrews be?", "a": "The UC328D1 insert uses two collar setscrews on the 140 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a pillow block like UCP328 instead of a flanged unit?", "a": "Choose the UCP328 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 200 mm above the 620 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it." }, { "q": "Can I replace just the insert inside an UCP328 unit?", "a": "Yes — UCP328 is an assembly of the P328 housing and UC328D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 140 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCP328 mounted bearing?", "a": "UCP328 takes a 140 mm shaft (insert UC328D1, 300 mm OD) and has a unit mass of about 84.0 kg. Housing figures: centre height H 200 mm, length L 620 mm, bolt centres J 500 mm, foot holes 40 mm for M33 bolts." }, { "q": "What does the UCP328 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 140 mm bore. UCP328 is built from housing P328 plus insert UC328D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCP328", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL201", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 12, "D_mm": 32, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 500, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL201", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL201" ], "naming_rule_text": "UCFL201 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC201D1 ball bearing insert pre-assembled in a FL204 cast-iron flange housing. The UCFL201 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 12 mm; FL204 and UC201D1 are the separate housing and insert part numbers inside. Shaft size is 12 mm; the 113 mm overall-height flange is 60 mm long across the rhombus (L), with its two mounting holes on 90 mm centres (J) clearing 12 mm M10 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC201D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL201 weighs about 0.5 kg.", "applications": [ "light belt and roller conveyors", "small packaging and labelling machines", "appliance and HVAC OEM drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "Never weld a bracket to the FL204 housing of UCFL201: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Small units like UCFL201 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 12 mm bore or the points strip out of the shaft.", "The standard 2-series insert in UCFL201 is the lightest section at 12 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL201 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL201 locked to the shaft, and how tight should the setscrews be?", "a": "The UC201D1 insert uses two collar setscrews on the 12 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL201 instead of a pillow block?", "a": "Choose the UCFL201 two-bolt flange when the 12 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL201 mounted bearing?", "a": "UCFL201 takes a 12 mm shaft (insert UC201D1, 32 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." }, { "q": "What does the UCFL201 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 12 mm bore. UCFL201 is built from housing FL204 plus insert UC201D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL202", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 15, "D_mm": 35, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 500, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL202", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL202" ], "naming_rule_text": "The NTN UCFL202 flanged unit combines a sealed UC202D1 insert with a diamond-shaped FL204 cast-iron housing that bolts flat against a machine frame. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 15 mm bore. Key mounting figures: flange height H = 113 mm, overall length L = 60 mm across the diamond, bolt centres J = 90 mm, and each ear takes a 12 mm (M10) fastener for the 15 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC202D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL202 weighs about 0.5 kg.", "applications": [ "small packaging and labelling machines", "appliance and HVAC OEM drives", "food-table and bottle-line rollers", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 15 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCFL202, so check journal straightness before fitting.", "The standard 2-series insert in UCFL202 is the lightest section at 15 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL202 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "At replacement time, measure the 15 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL202 creep identically to the old one.", "UCFL202 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 15 mm journal over time." ], "faq": [ { "q": "Does UCFL202 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 90 mm bolt centres of UCFL202 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCFL202 mounted bearing?", "a": "UCFL202 takes a 15 mm shaft (insert UC202D1, 35 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." }, { "q": "What does the UCFL202 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 15 mm bore. UCFL202 is built from housing FL204 plus insert UC202D1 (D1 = greasable)." }, { "q": "How is UCFL202 locked to the shaft, and how tight should the setscrews be?", "a": "The UC202D1 insert uses two collar setscrews on the 15 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL202 instead of a pillow block?", "a": "Choose the UCFL202 two-bolt flange when the 15 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL203", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 17, "D_mm": 40, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 500, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL203", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL203" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL203 is the two-bolt rhombus flange option for a 17 mm shaft: insert UC203D1, housing FL204, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 17 mm shaft size; the unit is built from insert UC203D1 and housing FL204. For the frame-face drawing of UCFL203: the two holes are 90 mm apart (J), the rhombus spans 60 mm (L) and 113 mm (H), and M10 (12 mm) bolts clamp it around the 17 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Small-bore mounted units like this are chosen mostly to eliminate bearing-housing design work on OEM machines built in the tens of units rather than for duty-cycle reasons. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC203D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL203 weighs about 0.5 kg.", "applications": [ "appliance and HVAC OEM drives", "food-table and bottle-line rollers", "small fans and blowers", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The standard 2-series insert in UCFL203 is the lightest section at 17 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL203 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC203D1 insert of UCFL203 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCFL203 weighs little but its cast feet still crack on an uneven weldment; the 90 mm bolt centres must sit on a flat face, not bridge a weld bead." ], "faq": [ { "q": "What are the dimensions of an UCFL203 mounted bearing?", "a": "UCFL203 takes a 17 mm shaft (insert UC203D1, 40 mm OD) and has a unit mass of about 0.5 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." }, { "q": "What does the UCFL203 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 17 mm bore. UCFL203 is built from housing FL204 plus insert UC203D1 (D1 = greasable)." }, { "q": "How is UCFL203 locked to the shaft, and how tight should the setscrews be?", "a": "The UC203D1 insert uses two collar setscrews on the 17 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL203 instead of a pillow block?", "a": "Choose the UCFL203 two-bolt flange when the 17 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL204", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 20, "D_mm": 47, "B_mm": 31, "seal_type": "2RS", "dynamic_load_kN": 14.2, "static_load_kN": 6.65, "fatigue_load_limit_kN": 0.505, "weight_g": 400, "housing_height_mm": 113, "base_length_mm": 60, "bolt_spacing_mm": 90, "bolt_size_mm": 12, "manufacturer_designation": "UCFL204", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL204" ], "naming_rule_text": "NTN delivers UCFL204 as a matched unit — the UC204D1 insert is locked into the FL204 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL204 means the FL204 housing carrying the UC204D1 insert, with the last two digits denoting the 20 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 113 mm flange height, L 60 mm across the ears, J 90 mm between the 12 mm holes, and a 20 mm shaft through the 47 mm OD UC204D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC204D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCFL204 weighs about 0.4 kg.", "applications": [ "food-table and bottle-line rollers", "small fans and blowers", "light agricultural augers", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL204 pulls against the frame through only two M10 bolts on 90 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFL204 with a bare UC204D1 bearing: replacing only the insert is possible, but the housing FL204 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCFL204, note the steel and cast-iron cover executions change the unit mass and envelope but not the 90 mm mounting centres.", "Small units like UCFL204 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 20 mm bore or the points strip out of the shaft.", "The standard 2-series insert in UCFL204 is the lightest section at 20 mm — do not substitute it into a position that previously ran an X or 3 unit: the 90 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCFL204 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 20 mm bore. UCFL204 is built from housing FL204 plus insert UC204D1 (D1 = greasable)." }, { "q": "How is UCFL204 locked to the shaft, and how tight should the setscrews be?", "a": "The UC204D1 insert uses two collar setscrews on the 20 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL204 instead of a pillow block?", "a": "Choose the UCFL204 two-bolt flange when the 20 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 90 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL204 bearing self-aligning?", "a": "Yes within limits. The UC204D1 insert has a spherical outer diameter that pivots in the FL204 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL204 mounted bearing?", "a": "UCFL204 takes a 20 mm shaft (insert UC204D1, 47 mm OD) and has a unit mass of about 0.4 kg. Flange figures: height H 113 mm, length L 60 mm, bolt centres J 90 mm, holes 12 mm for M10 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL205", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 25, "D_mm": 52, "B_mm": 34.1, "seal_type": "2RS", "dynamic_load_kN": 15.5, "static_load_kN": 7.85, "fatigue_load_limit_kN": 0.55, "weight_g": 600, "housing_height_mm": 130, "base_length_mm": 68, "bolt_spacing_mm": 99, "bolt_size_mm": 16, "manufacturer_designation": "UCFL205", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL205" ], "naming_rule_text": "UCFL205 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC205D1 insert in a JIS B 1559 FL205 housing. On the nameplate, UCFL205 decodes as a UC wide-inner-ring insert in a FL diamond flange, 2-series duty, 25 mm bore; the UC205D1 designation shows the D1 greasable execution. Boundary data for the 25 mm bore: 130 mm high flange, 68 mm long over the rhombus, 99 mm hole centres for M14 fasteners through 16 mm holes; insert OD is 52 mm. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC205D1 insert are 15.5 kN dynamic and 7.85 kN static; the assembled UCFL205 weighs about 0.6 kg.", "applications": [ "textile line-shafting", "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "UCFL205 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 25 mm journal over time.", "In this bore band the temptation is to choose UCFL205 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The standard 2-series insert in UCFL205 is the lightest section at 25 mm — do not substitute it into a position that previously ran an X or 3 unit: the 99 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL205 pulls against the frame through only two M14 bolts on 99 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL205 locked to the shaft, and how tight should the setscrews be?", "a": "The UC205D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL205 instead of a pillow block?", "a": "Choose the UCFL205 two-bolt flange when the 25 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 99 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL205 mounted bearing?", "a": "UCFL205 takes a 25 mm shaft (insert UC205D1, 52 mm OD) and has a unit mass of about 0.6 kg. Flange figures: height H 130 mm, length L 68 mm, bolt centres J 99 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL205 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 25 mm bore. UCFL205 is built from housing FL205 plus insert UC205D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX05", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 25, "D_mm": 62, "B_mm": 38.1, "seal_type": "2RS", "dynamic_load_kN": 21.6, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.795, "weight_g": 1000, "housing_height_mm": 141, "base_length_mm": 83, "bolt_spacing_mm": 117, "bolt_size_mm": 12, "manufacturer_designation": "UCFLX05", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX05" ], "naming_rule_text": "NTN delivers UCFLX05 as a matched unit — the UCX05D1 insert is locked into the FLX05 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFLX05 means the FLX05 housing carrying the UCX05D1 insert, with the last two digits denoting the 25 mm bore in the X-series duty class. The mounting detail needs four numbers: H 141 mm flange height, L 83 mm across the ears, J 117 mm between the 12 mm holes, and a 25 mm shaft through the 62 mm OD UCX05D1 insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UCX05D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCFLX05 weighs about 1.0 kg.", "applications": [ "small crushers and screening feeds", "textile line-shafting", "machine-tool chip conveyors", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFLX05 pulls against the frame through only two M10 bolts on 117 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFLX05 with a bare UCX05D1 bearing: replacing only the insert is possible, but the housing FLX05 must be unworn and the spherical seat cleaned and coated with anti-seize.", "When ordering covers for UCFLX05, note the steel and cast-iron cover executions change the unit mass and envelope but not the 117 mm mounting centres.", "With a 25 mm shaft the M10 foundation bolts of UCFLX05 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The X insert of UCFLX05 is wider and rated above the 2-series part at 25 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping." ], "faq": [ { "q": "What does the UCFLX05 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 25 mm bore. UCFLX05 is built from housing FLX05 plus insert UCX05D1 (D1 = greasable)." }, { "q": "How is UCFLX05 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX05D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX05 instead of a pillow block?", "a": "Choose the UCFLX05 two-bolt flange when the 25 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M10 bolts on 117 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFLX05 bearing self-aligning?", "a": "Yes within limits. The UCX05D1 insert has a spherical outer diameter that pivots in the FLX05 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFLX05 mounted bearing?", "a": "UCFLX05 takes a 25 mm shaft (insert UCX05D1, 62 mm OD) and has a unit mass of about 1.0 kg. Flange figures: height H 141 mm, length L 83 mm, bolt centres J 117 mm, holes 12 mm for M10 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX05", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL305", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 25, "D_mm": 62, "B_mm": 38, "seal_type": "2RS", "dynamic_load_kN": 23.5, "static_load_kN": 10.9, "fatigue_load_limit_kN": 0.855, "weight_g": 900, "housing_height_mm": 150, "base_length_mm": 80, "bolt_spacing_mm": 113, "bolt_size_mm": 19, "manufacturer_designation": "UCFL305", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL305" ], "naming_rule_text": "For a 25 mm shaft ending at or passing through a vertical frame face, NTN UCFL305 is the diamond-flange answer: UC305D1 insert inside the FL305 cast-iron housing. The UCFL305 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 25 mm; FL305 and UC305D1 are the separate housing and insert part numbers inside. Shaft size is 25 mm; the 150 mm overall-height flange is 80 mm long across the rhombus (L), with its two mounting holes on 113 mm centres (J) clearing 19 mm M16 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Textile and fibre-processing machines use these units on long line-shafting; several bearings share one shaft, and the self-aligning feature prevents one poor bracket from loading its neighbours. A film of anti-seize on the spherical surfaces at assembly prevents fretting corrosion welding insert to housing — the failure mode that turns a five-minute insert swap into a housing replacement. Basic ratings of the UC305D1 insert are 23.5 kN dynamic and 10.9 kN static; the assembled UCFL305 weighs about 0.9 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Never weld a bracket to the FL305 housing of UCFL305: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "With a 25 mm shaft the M16 foundation bolts of UCFL305 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The 3-series insert makes UCFL305 the highest-rated unit at 25 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL305 pulls against the frame through only two M16 bolts on 113 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL305 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL305 instead of a pillow block?", "a": "Choose the UCFL305 two-bolt flange when the 25 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 113 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL305 unit carry?", "a": "The UC305D1 insert is rated at 23.5 kN dynamic and 10.9 kN basic static (fatigue load limit 0.855 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL305 mounted bearing?", "a": "UCFL305 takes a 25 mm shaft (insert UC305D1, 62 mm OD) and has a unit mass of about 0.9 kg. Flange figures: height H 150 mm, length L 80 mm, bolt centres J 113 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL305 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 25 mm bore. UCFL305 is built from housing FL305 plus insert UC305D1 (D1 = greasable)." }, { "q": "How is UCFL305 locked to the shaft, and how tight should the setscrews be?", "a": "The UC305D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL206", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 30, "D_mm": 62, "B_mm": 38.1, "seal_type": "2RS", "dynamic_load_kN": 21.6, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.795, "weight_g": 800, "housing_height_mm": 148, "base_length_mm": 80, "bolt_spacing_mm": 117, "bolt_size_mm": 16, "manufacturer_designation": "UCFL206", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL206" ], "naming_rule_text": "For a 30 mm shaft ending at or passing through a vertical frame face, NTN UCFL206 is the diamond-flange answer: UC206D1 insert inside the FL206 cast-iron housing. The UCFL206 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 30 mm; FL206 and UC206D1 are the separate housing and insert part numbers inside. Shaft size is 30 mm; the 148 mm overall-height flange is 80 mm long across the rhombus (L), with its two mounting holes on 117 mm centres (J) clearing 16 mm M14 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC206D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCFL206 weighs about 0.8 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Never weld a bracket to the FL206 housing of UCFL206: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFL206 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The standard 2-series insert in UCFL206 is the lightest section at 30 mm — do not substitute it into a position that previously ran an X or 3 unit: the 117 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL206 pulls against the frame through only two M14 bolts on 117 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL206 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL206 instead of a pillow block?", "a": "Choose the UCFL206 two-bolt flange when the 30 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 117 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL206 unit carry?", "a": "The UC206D1 insert is rated at 21.6 kN dynamic and 11.3 kN basic static (fatigue load limit 0.795 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL206 mounted bearing?", "a": "UCFL206 takes a 30 mm shaft (insert UC206D1, 62 mm OD) and has a unit mass of about 0.8 kg. Flange figures: height H 148 mm, length L 80 mm, bolt centres J 117 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL206 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 30 mm bore. UCFL206 is built from housing FL206 plus insert UC206D1 (D1 = greasable)." }, { "q": "How is UCFL206 locked to the shaft, and how tight should the setscrews be?", "a": "The UC206D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX06", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 30, "D_mm": 72, "B_mm": 42.9, "seal_type": "2RS", "dynamic_load_kN": 28.4, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.09, "weight_g": 1400, "housing_height_mm": 156, "base_length_mm": 95, "bolt_spacing_mm": 130, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX06", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX06" ], "naming_rule_text": "UCFLX06 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UCX06D1 insert in a JIS B 1559 FLX06 housing. On the nameplate, UCFLX06 decodes as a UC wide-inner-ring insert in a FL diamond flange, X-series duty, 30 mm bore; the UCX06D1 designation shows the D1 greasable execution. Boundary data for the 30 mm bore: 156 mm high flange, 95 mm long over the rhombus, 130 mm hole centres for M14 fasteners through 16 mm holes; insert OD is 72 mm. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UCX06D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCFLX06 weighs about 1.4 kg.", "applications": [ "textile line-shafting", "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "UCFLX06 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 30 mm journal over time.", "In this bore band the temptation is to choose UCFLX06 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The X insert of UCFLX06 is wider and rated above the 2-series part at 30 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX06 pulls against the frame through only two M14 bolts on 130 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFLX06 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX06D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX06 instead of a pillow block?", "a": "Choose the UCFLX06 two-bolt flange when the 30 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 130 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFLX06 mounted bearing?", "a": "UCFLX06 takes a 30 mm shaft (insert UCX06D1, 72 mm OD) and has a unit mass of about 1.4 kg. Flange figures: height H 156 mm, length L 95 mm, bolt centres J 130 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX06 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 30 mm bore. UCFLX06 is built from housing FLX06 plus insert UCX06D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX06", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL306", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 30, "D_mm": 72, "B_mm": 43, "seal_type": "2RS", "dynamic_load_kN": 29.5, "static_load_kN": 15, "fatigue_load_limit_kN": 1.14, "weight_g": 1400, "housing_height_mm": 180, "base_length_mm": 90, "bolt_spacing_mm": 134, "bolt_size_mm": 23, "manufacturer_designation": "UCFL306", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL306" ], "naming_rule_text": "UCFL306 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC306D1 ball bearing insert pre-assembled in a FL306 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 30 mm bore. Key mounting figures: flange height H = 180 mm, overall length L = 90 mm across the diamond, bolt centres J = 134 mm, and each ear takes a 23 mm (M20) fastener for the 30 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC306D1 insert are 29.5 kN dynamic and 15 kN static; the assembled UCFL306 weighs about 1.4 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The 3-series insert makes UCFL306 the highest-rated unit at 30 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL306 pulls against the frame through only two M20 bolts on 134 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL306, note the steel and cast-iron cover executions change the unit mass and envelope but not the 134 mm mounting centres.", "In this bore band the temptation is to choose UCFL306 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCFL306 mounted bearing?", "a": "UCFL306 takes a 30 mm shaft (insert UC306D1, 72 mm OD) and has a unit mass of about 1.4 kg. Flange figures: height H 180 mm, length L 90 mm, bolt centres J 134 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL306 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 30 mm bore. UCFL306 is built from housing FL306 plus insert UC306D1 (D1 = greasable)." }, { "q": "How is UCFL306 locked to the shaft, and how tight should the setscrews be?", "a": "The UC306D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL306 instead of a pillow block?", "a": "Choose the UCFL306 two-bolt flange when the 30 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 134 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL207", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 35, "D_mm": 72, "B_mm": 42.9, "seal_type": "2RS", "dynamic_load_kN": 28.4, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.09, "weight_g": 1200, "housing_height_mm": 161, "base_length_mm": 90, "bolt_spacing_mm": 130, "bolt_size_mm": 16, "manufacturer_designation": "UCFL207", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL207" ], "naming_rule_text": "UCFL207 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC207D1 ball bearing insert pre-assembled in a FL207 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 35 mm bore. Key mounting figures: flange height H = 161 mm, overall length L = 90 mm across the diamond, bolt centres J = 130 mm, and each ear takes a 16 mm (M14) fastener for the 35 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC207D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCFL207 weighs about 1.2 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The standard 2-series insert in UCFL207 is the lightest section at 35 mm — do not substitute it into a position that previously ran an X or 3 unit: the 130 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL207 pulls against the frame through only two M14 bolts on 130 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL207, note the steel and cast-iron cover executions change the unit mass and envelope but not the 130 mm mounting centres.", "With a 35 mm shaft the M14 foundation bolts of UCFL207 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCFL207 mounted bearing?", "a": "UCFL207 takes a 35 mm shaft (insert UC207D1, 72 mm OD) and has a unit mass of about 1.2 kg. Flange figures: height H 161 mm, length L 90 mm, bolt centres J 130 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL207 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 35 mm bore. UCFL207 is built from housing FL207 plus insert UC207D1 (D1 = greasable)." }, { "q": "How is UCFL207 locked to the shaft, and how tight should the setscrews be?", "a": "The UC207D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL207 instead of a pillow block?", "a": "Choose the UCFL207 two-bolt flange when the 35 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 130 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX07", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 35, "D_mm": 80, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "weight_g": 1800, "housing_height_mm": 171, "base_length_mm": 105, "bolt_spacing_mm": 144, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX07", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX07" ], "naming_rule_text": "For a 35 mm shaft ending at or passing through a vertical frame face, NTN UCFLX07 is the diamond-flange answer: UCX07D1 insert inside the FLX07 cast-iron housing. The UCFLX07 number follows NTN's mounted-unit convention: housing letter FL, X-series section, bore code for 35 mm; FLX07 and UCX07D1 are the separate housing and insert part numbers inside. Shaft size is 35 mm; the 171 mm overall-height flange is 105 mm long across the rhombus (L), with its two mounting holes on 144 mm centres (J) clearing 16 mm M14 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UCX07D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCFLX07 weighs about 1.8 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "Never weld a bracket to the FLX07 housing of UCFLX07: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFLX07 can look adequate at 35 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The X insert of UCFLX07 is wider and rated above the 2-series part at 35 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX07 pulls against the frame through only two M14 bolts on 144 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFLX07 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFLX07 instead of a pillow block?", "a": "Choose the UCFLX07 two-bolt flange when the 35 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 144 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFLX07 unit carry?", "a": "The UCX07D1 insert is rated at 32.5 kN dynamic and 17.8 kN basic static (fatigue load limit 1.24 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFLX07 mounted bearing?", "a": "UCFLX07 takes a 35 mm shaft (insert UCX07D1, 80 mm OD) and has a unit mass of about 1.8 kg. Flange figures: height H 171 mm, length L 105 mm, bolt centres J 144 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX07 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 35 mm bore. UCFLX07 is built from housing FLX07 plus insert UCX07D1 (D1 = greasable)." }, { "q": "How is UCFLX07 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX07D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX07", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL307", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 35, "D_mm": 80, "B_mm": 48, "seal_type": "2RS", "dynamic_load_kN": 37, "static_load_kN": 19.1, "fatigue_load_limit_kN": 1.47, "weight_g": 1700, "housing_height_mm": 185, "base_length_mm": 100, "bolt_spacing_mm": 141, "bolt_size_mm": 23, "manufacturer_designation": "UCFL307", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL307" ], "naming_rule_text": "The NTN UCFL307 flanged unit combines a sealed UC307D1 insert with a diamond-shaped FL307 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 35 mm shaft size; the unit is built from insert UC307D1 and housing FL307. For the frame-face drawing of UCFL307: the two holes are 141 mm apart (J), the rhombus spans 100 mm (L) and 185 mm (H), and M20 (23 mm) bolts clamp it around the 35 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC307D1 insert are 37 kN dynamic and 19.1 kN static; the assembled UCFL307 weighs about 1.7 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCFL307 the highest-rated unit at 35 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL307 pulls against the frame through only two M20 bolts on 141 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC307D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL307 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC307D1 insert of UCFL307 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "The standard section of UCFL307 can look adequate at 35 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide." ], "faq": [ { "q": "What are the dimensions of an UCFL307 mounted bearing?", "a": "UCFL307 takes a 35 mm shaft (insert UC307D1, 80 mm OD) and has a unit mass of about 1.7 kg. Flange figures: height H 185 mm, length L 100 mm, bolt centres J 141 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL307 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 35 mm bore. UCFL307 is built from housing FL307 plus insert UC307D1 (D1 = greasable)." }, { "q": "How is UCFL307 locked to the shaft, and how tight should the setscrews be?", "a": "The UC307D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL307 instead of a pillow block?", "a": "Choose the UCFL307 two-bolt flange when the 35 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 141 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL307 unit?", "a": "There is no single interval for UCFL307: the UC307D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL208", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 40, "D_mm": 80, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 32.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.24, "weight_g": 1500, "housing_height_mm": 175, "base_length_mm": 100, "bolt_spacing_mm": 144, "bolt_size_mm": 16, "manufacturer_designation": "UCFL208", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL208" ], "naming_rule_text": "The NTN UCFL208 flanged unit combines a sealed UC208D1 insert with a diamond-shaped FL208 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 40 mm shaft size; the unit is built from insert UC208D1 and housing FL208. For the frame-face drawing of UCFL208: the two holes are 144 mm apart (J), the rhombus spans 100 mm (L) and 175 mm (H), and M14 (16 mm) bolts clamp it around the 40 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC208D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCFL208 weighs about 1.5 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCFL208 is the lightest section at 40 mm — do not substitute it into a position that previously ran an X or 3 unit: the 144 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL208 pulls against the frame through only two M14 bolts on 144 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC208D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL208 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC208D1 insert of UCFL208 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "In this bore band the temptation is to choose UCFL208 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCFL208 mounted bearing?", "a": "UCFL208 takes a 40 mm shaft (insert UC208D1, 80 mm OD) and has a unit mass of about 1.5 kg. Flange figures: height H 175 mm, length L 100 mm, bolt centres J 144 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFL208 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 40 mm bore. UCFL208 is built from housing FL208 plus insert UC208D1 (D1 = greasable)." }, { "q": "How is UCFL208 locked to the shaft, and how tight should the setscrews be?", "a": "The UC208D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL208 instead of a pillow block?", "a": "Choose the UCFL208 two-bolt flange when the 40 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 144 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL208 unit?", "a": "There is no single interval for UCFL208: the UC208D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX08", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 40, "D_mm": 90, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "weight_g": 2000, "housing_height_mm": 179, "base_length_mm": 111, "bolt_spacing_mm": 148, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX08", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX08" ], "naming_rule_text": "UCFLX08 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UCX08D1 ball bearing insert pre-assembled in a FLX08 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the X code identifies the duty series and the final two digits encode the 40 mm bore. Key mounting figures: flange height H = 179 mm, overall length L = 111 mm across the diamond, bolt centres J = 148 mm, and each ear takes a 16 mm (M14) fastener for the 40 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UCX08D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCFLX08 weighs about 2.0 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The X insert of UCFLX08 is wider and rated above the 2-series part at 40 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX08 pulls against the frame through only two M14 bolts on 148 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFLX08, note the steel and cast-iron cover executions change the unit mass and envelope but not the 148 mm mounting centres.", "With a 40 mm shaft the M14 foundation bolts of UCFLX08 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCFLX08 mounted bearing?", "a": "UCFLX08 takes a 40 mm shaft (insert UCX08D1, 90 mm OD) and has a unit mass of about 2.0 kg. Flange figures: height H 179 mm, length L 111 mm, bolt centres J 148 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX08 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 40 mm bore. UCFLX08 is built from housing FLX08 plus insert UCX08D1 (D1 = greasable)." }, { "q": "How is UCFLX08 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX08D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX08 instead of a pillow block?", "a": "Choose the UCFLX08 two-bolt flange when the 40 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 148 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX08", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL308", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 40, "D_mm": 90, "B_mm": 52, "seal_type": "2RS", "dynamic_load_kN": 45, "static_load_kN": 24, "fatigue_load_limit_kN": 1.83, "weight_g": 2200, "housing_height_mm": 200, "base_length_mm": 112, "bolt_spacing_mm": 158, "bolt_size_mm": 23, "manufacturer_designation": "UCFL308", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL308" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL308 is the two-bolt rhombus flange option for a 40 mm shaft: insert UC308D1, housing FL308, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL308 means the FL308 housing carrying the UC308D1 insert, with the last two digits denoting the 40 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 200 mm flange height, L 112 mm across the ears, J 158 mm between the 23 mm holes, and a 40 mm shaft through the 90 mm OD UC308D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC308D1 insert are 45 kN dynamic and 24 kN static; the assembled UCFL308 weighs about 2.2 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "Never weld a bracket to the FL308 housing of UCFL308: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "With a 40 mm shaft the M20 foundation bolts of UCFL308 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.", "The 3-series insert makes UCFL308 the highest-rated unit at 40 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL308 pulls against the frame through only two M20 bolts on 158 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL308 locked to the shaft, and how tight should the setscrews be?", "a": "The UC308D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL308 instead of a pillow block?", "a": "Choose the UCFL308 two-bolt flange when the 40 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 158 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL308 mounted bearing?", "a": "UCFL308 takes a 40 mm shaft (insert UC308D1, 90 mm OD) and has a unit mass of about 2.2 kg. Flange figures: height H 200 mm, length L 112 mm, bolt centres J 158 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL308 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 40 mm bore. UCFL308 is built from housing FL308 plus insert UC308D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL209", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 45, "D_mm": 85, "B_mm": 49.2, "seal_type": "2RS", "dynamic_load_kN": 36, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.6, "weight_g": 1800, "housing_height_mm": 188, "base_length_mm": 108, "bolt_spacing_mm": 148, "bolt_size_mm": 19, "manufacturer_designation": "UCFL209", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL209" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL209 is the two-bolt rhombus flange option for a 45 mm shaft: insert UC209D1, housing FL209, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL209 means the FL209 housing carrying the UC209D1 insert, with the last two digits denoting the 45 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 188 mm flange height, L 108 mm across the ears, J 148 mm between the 19 mm holes, and a 45 mm shaft through the 85 mm OD UC209D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC209D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCFL209 weighs about 1.8 kg.", "applications": [ "agricultural augers and bucket elevators", "small crushers and screening feeds", "textile line-shafting", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "Never weld a bracket to the FL209 housing of UCFL209: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFL209 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The standard 2-series insert in UCFL209 is the lightest section at 45 mm — do not substitute it into a position that previously ran an X or 3 unit: the 148 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL209 pulls against the frame through only two M16 bolts on 148 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL209 locked to the shaft, and how tight should the setscrews be?", "a": "The UC209D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL209 instead of a pillow block?", "a": "Choose the UCFL209 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 148 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL209 mounted bearing?", "a": "UCFL209 takes a 45 mm shaft (insert UC209D1, 85 mm OD) and has a unit mass of about 1.8 kg. Flange figures: height H 188 mm, length L 108 mm, bolt centres J 148 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL209 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 45 mm bore. UCFL209 is built from housing FL209 plus insert UC209D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX09", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 45, "D_mm": 100, "B_mm": 51.6, "seal_type": "2RS", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "weight_g": 2200, "housing_height_mm": 189, "base_length_mm": 116, "bolt_spacing_mm": 157, "bolt_size_mm": 16, "manufacturer_designation": "UCFLX09", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX09" ], "naming_rule_text": "The NTN UCFLX09 flanged unit combines a sealed UCX09D1 insert with a diamond-shaped FLX09 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series X, bore code ending in the 45 mm shaft size; the unit is built from insert UCX09D1 and housing FLX09. For the frame-face drawing of UCFLX09: the two holes are 157 mm apart (J), the rhombus spans 116 mm (L) and 189 mm (H), and M14 (16 mm) bolts clamp it around the 45 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UCX09D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCFLX09 weighs about 2.2 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The X insert of UCFLX09 is wider and rated above the 2-series part at 45 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX09 pulls against the frame through only two M14 bolts on 157 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UCX09D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFLX09 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UCX09D1 insert of UCFLX09 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "In this bore band the temptation is to choose UCFLX09 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power." ], "faq": [ { "q": "What are the dimensions of an UCFLX09 mounted bearing?", "a": "UCFLX09 takes a 45 mm shaft (insert UCX09D1, 100 mm OD) and has a unit mass of about 2.2 kg. Flange figures: height H 189 mm, length L 116 mm, bolt centres J 157 mm, holes 16 mm for M14 bolts." }, { "q": "What does the UCFLX09 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 45 mm bore. UCFLX09 is built from housing FLX09 plus insert UCX09D1 (D1 = greasable)." }, { "q": "How is UCFLX09 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX09D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX09 instead of a pillow block?", "a": "Choose the UCFLX09 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M14 bolts on 157 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFLX09 unit?", "a": "There is no single interval for UCFLX09: the UCX09D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX09", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL309", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 45, "D_mm": 100, "B_mm": 57, "seal_type": "2RS", "dynamic_load_kN": 58.5, "static_load_kN": 32, "fatigue_load_limit_kN": 2.5, "weight_g": 3000, "housing_height_mm": 230, "base_length_mm": 125, "bolt_spacing_mm": 177, "bolt_size_mm": 25, "manufacturer_designation": "UCFL309", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL309" ], "naming_rule_text": "NTN delivers UCFL309 as a matched unit — the UC309D1 insert is locked into the FL309 rhombus cast-iron flange at the factory and arrives greased and sealed. On the nameplate, UCFL309 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 45 mm bore; the UC309D1 designation shows the D1 greasable execution. Boundary data for the 45 mm bore: 230 mm high flange, 125 mm long over the rhombus, 177 mm hole centres for M22 fasteners through 25 mm holes; insert OD is 100 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC309D1 insert are 58.5 kN dynamic and 32 kN static; the assembled UCFL309 weighs about 3.0 kg.", "applications": [ "small crushers and screening feeds", "textile line-shafting", "machine-tool chip conveyors", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "At replacement time, measure the 45 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL309 creep identically to the old one.", "UCFL309 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 45 mm journal over time.", "In this bore band the temptation is to choose UCFL309 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.", "The 3-series insert makes UCFL309 the highest-rated unit at 45 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL309 pulls against the frame through only two M22 bolts on 177 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL309 locked to the shaft, and how tight should the setscrews be?", "a": "The UC309D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL309 instead of a pillow block?", "a": "Choose the UCFL309 two-bolt flange when the 45 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 177 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Can I replace just the insert inside an UCFL309 unit?", "a": "Yes — UCFL309 is an assembly of the FL309 housing and UC309D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 45 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCFL309 mounted bearing?", "a": "UCFL309 takes a 45 mm shaft (insert UC309D1, 100 mm OD) and has a unit mass of about 3.0 kg. Flange figures: height H 230 mm, length L 125 mm, bolt centres J 177 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL309 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 45 mm bore. UCFL309 is built from housing FL309 plus insert UC309D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL210", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 50, "D_mm": 90, "B_mm": 51.6, "seal_type": "2RS", "dynamic_load_kN": 39, "static_load_kN": 23.2, "fatigue_load_limit_kN": 1.82, "weight_g": 2000, "housing_height_mm": 197, "base_length_mm": 115, "bolt_spacing_mm": 157, "bolt_size_mm": 19, "manufacturer_designation": "UCFL210", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL210" ], "naming_rule_text": "UCFL210 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC210D1 ball bearing insert pre-assembled in a FL210 cast-iron flange housing. The UCFL210 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 50 mm; FL210 and UC210D1 are the separate housing and insert part numbers inside. Shaft size is 50 mm; the 197 mm overall-height flange is 115 mm long across the rhombus (L), with its two mounting holes on 157 mm centres (J) clearing 19 mm M16 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC210D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCFL210 weighs about 2.0 kg.", "applications": [ "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "agricultural augers and bucket elevators", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "The standard 2-series insert in UCFL210 is the lightest section at 50 mm — do not substitute it into a position that previously ran an X or 3 unit: the 157 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL210 pulls against the frame through only two M16 bolts on 157 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL210, note the steel and cast-iron cover executions change the unit mass and envelope but not the 157 mm mounting centres.", "With a 50 mm shaft the M16 foundation bolts of UCFL210 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews." ], "faq": [ { "q": "What are the dimensions of an UCFL210 mounted bearing?", "a": "UCFL210 takes a 50 mm shaft (insert UC210D1, 90 mm OD) and has a unit mass of about 2.0 kg. Flange figures: height H 197 mm, length L 115 mm, bolt centres J 157 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL210 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 50 mm bore. UCFL210 is built from housing FL210 plus insert UC210D1 (D1 = greasable)." }, { "q": "How is UCFL210 locked to the shaft, and how tight should the setscrews be?", "a": "The UC210D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL210 instead of a pillow block?", "a": "Choose the UCFL210 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 157 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFLX10", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 50, "D_mm": 110, "B_mm": 55.6, "seal_type": "2RS", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "weight_g": 3000, "housing_height_mm": 216, "base_length_mm": 133, "bolt_spacing_mm": 184, "bolt_size_mm": 19, "manufacturer_designation": "UCFLX10", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFLX10" ], "naming_rule_text": "For a 50 mm shaft ending at or passing through a vertical frame face, NTN UCFLX10 is the diamond-flange answer: UCX10D1 insert inside the FLX10 cast-iron housing. On the nameplate, UCFLX10 decodes as a UC wide-inner-ring insert in a FL diamond flange, X-series duty, 50 mm bore; the UCX10D1 designation shows the D1 greasable execution. Boundary data for the 50 mm bore: 216 mm high flange, 133 mm long over the rhombus, 184 mm hole centres for M16 fasteners through 19 mm holes; insert OD is 110 mm. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UCX10D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCFLX10 weighs about 3.0 kg.", "applications": [ "machine-tool chip conveyors", "belt conveyor head, tail and bend pulleys", "industrial fans and blowers", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The lip seals and slingers on UCFLX10 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the FLX10 housing of UCFLX10: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "The standard section of UCFLX10 can look adequate at 50 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The X insert of UCFLX10 is wider and rated above the 2-series part at 50 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.", "As a rhombus flange, UCFLX10 pulls against the frame through only two M16 bolts on 184 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFLX10 locked to the shaft, and how tight should the setscrews be?", "a": "The UCX10D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFLX10 instead of a pillow block?", "a": "Choose the UCFLX10 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 184 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Can I replace just the insert inside an UCFLX10 unit?", "a": "Yes — UCFLX10 is an assembly of the FLX10 housing and UCX10D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 50 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCFLX10 mounted bearing?", "a": "UCFLX10 takes a 50 mm shaft (insert UCX10D1, 110 mm OD) and has a unit mass of about 3.0 kg. Flange figures: height H 216 mm, length L 133 mm, bolt centres J 184 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFLX10 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; X is the duty series; the last digits encode the 50 mm bore. UCFLX10 is built from housing FLX10 plus insert UCX10D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFLX10", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL310", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 50, "D_mm": 110, "B_mm": 61, "seal_type": "2RS", "dynamic_load_kN": 68.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.99, "weight_g": 4100, "housing_height_mm": 240, "base_length_mm": 140, "bolt_spacing_mm": 187, "bolt_size_mm": 25, "manufacturer_designation": "UCFL310", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL310" ], "naming_rule_text": "The NTN UCFL310 flanged unit combines a sealed UC310D1 insert with a diamond-shaped FL310 cast-iron housing that bolts flat against a machine frame. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 50 mm bore. Key mounting figures: flange height H = 240 mm, overall length L = 140 mm across the diamond, bolt centres J = 187 mm, and each ear takes a 25 mm (M22) fastener for the 50 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC310D1 insert are 68.5 kN dynamic and 38.5 kN static; the assembled UCFL310 weighs about 4.1 kg.", "applications": [ "industrial fans and blowers", "agricultural augers and bucket elevators", "small crushers and screening feeds", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "The standard section of UCFL310 can look adequate at 50 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.", "The 3-series insert makes UCFL310 the highest-rated unit at 50 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL310 pulls against the frame through only two M22 bolts on 187 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC310D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL310 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC310D1 insert of UCFL310 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat." ], "faq": [ { "q": "Does UCFL310 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 187 mm bolt centres of UCFL310 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCFL310 mounted bearing?", "a": "UCFL310 takes a 50 mm shaft (insert UC310D1, 110 mm OD) and has a unit mass of about 4.1 kg. Flange figures: height H 240 mm, length L 140 mm, bolt centres J 187 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL310 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 50 mm bore. UCFL310 is built from housing FL310 plus insert UC310D1 (D1 = greasable)." }, { "q": "How is UCFL310 locked to the shaft, and how tight should the setscrews be?", "a": "The UC310D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL310 instead of a pillow block?", "a": "Choose the UCFL310 two-bolt flange when the 50 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 187 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL211", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 55, "D_mm": 100, "B_mm": 55.6, "seal_type": "2RS", "dynamic_load_kN": 48, "static_load_kN": 29.2, "fatigue_load_limit_kN": 2.29, "weight_g": 2900, "housing_height_mm": 224, "base_length_mm": 130, "bolt_spacing_mm": 184, "bolt_size_mm": 19, "manufacturer_designation": "UCFL211", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL211" ], "naming_rule_text": "The NTN UCFL211 flanged unit combines a sealed UC211D1 insert with a diamond-shaped FL211 cast-iron housing that bolts flat against a machine frame. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 55 mm bore. Key mounting figures: flange height H = 224 mm, overall length L = 130 mm across the diamond, bolt centres J = 184 mm, and each ear takes a 19 mm (M16) fastener for the 55 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC211D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCFL211 weighs about 2.9 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener" ], "pitfalls": [ "At 55 mm bore the 130 mm base of UCFL211 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The standard 2-series insert in UCFL211 is the lightest section at 55 mm — do not substitute it into a position that previously ran an X or 3 unit: the 184 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL211 pulls against the frame through only two M16 bolts on 184 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC211D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL211 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC211D1 insert of UCFL211 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat." ], "faq": [ { "q": "Does UCFL211 interchange with other brands at the same size?", "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 184 mm bolt centres of UCFL211 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match." }, { "q": "What are the dimensions of an UCFL211 mounted bearing?", "a": "UCFL211 takes a 55 mm shaft (insert UC211D1, 100 mm OD) and has a unit mass of about 2.9 kg. Flange figures: height H 224 mm, length L 130 mm, bolt centres J 184 mm, holes 19 mm for M16 bolts." }, { "q": "What does the UCFL211 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 55 mm bore. UCFL211 is built from housing FL211 plus insert UC211D1 (D1 = greasable)." }, { "q": "How is UCFL211 locked to the shaft, and how tight should the setscrews be?", "a": "The UC211D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL211 instead of a pillow block?", "a": "Choose the UCFL211 two-bolt flange when the 55 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M16 bolts on 184 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL311", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 55, "D_mm": 120, "B_mm": 66, "seal_type": "2RS", "dynamic_load_kN": 79.5, "static_load_kN": 45, "fatigue_load_limit_kN": 3.5, "weight_g": 4600, "housing_height_mm": 250, "base_length_mm": 150, "bolt_spacing_mm": 198, "bolt_size_mm": 25, "manufacturer_designation": "UCFL311", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL311" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL311 is the two-bolt rhombus flange option for a 55 mm shaft: insert UC311D1, housing FL311, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 55 mm shaft size; the unit is built from insert UC311D1 and housing FL311. For the frame-face drawing of UCFL311: the two holes are 198 mm apart (J), the rhombus spans 150 mm (L) and 250 mm (H), and M22 (25 mm) bolts clamp it around the 55 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC311D1 insert are 79.5 kN dynamic and 45 kN static; the assembled UCFL311 weighs about 4.6 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "Never weld a bracket to the FL311 housing of UCFL311: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "Heavy drives on UCFL311 should have the setscrews re-torqued after the first day; at 55 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The 3-series insert makes UCFL311 the highest-rated unit at 55 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL311 pulls against the frame through only two M22 bolts on 198 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL311 locked to the shaft, and how tight should the setscrews be?", "a": "The UC311D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL311 instead of a pillow block?", "a": "Choose the UCFL311 two-bolt flange when the 55 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 198 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL311 mounted bearing?", "a": "UCFL311 takes a 55 mm shaft (insert UC311D1, 120 mm OD) and has a unit mass of about 4.6 kg. Flange figures: height H 250 mm, length L 150 mm, bolt centres J 198 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL311 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 55 mm bore. UCFL311 is built from housing FL311 plus insert UC311D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL212", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 60, "D_mm": 110, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 58, "static_load_kN": 36, "fatigue_load_limit_kN": 2.83, "weight_g": 3800, "housing_height_mm": 250, "base_length_mm": 140, "bolt_spacing_mm": 202, "bolt_size_mm": 23, "manufacturer_designation": "UCFL212", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL212" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL212 is the two-bolt rhombus flange option for a 60 mm shaft: insert UC212D1, housing FL212, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 60 mm shaft size; the unit is built from insert UC212D1 and housing FL212. For the frame-face drawing of UCFL212: the two holes are 202 mm apart (J), the rhombus spans 140 mm (L) and 250 mm (H), and M20 (23 mm) bolts clamp it around the 60 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC212D1 insert are 58 kN dynamic and 36 kN static; the assembled UCFL212 weighs about 3.8 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "continuous one-direction running where creep risk concentrates on the setscrew points" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "Never weld a bracket to the FL212 housing of UCFL212: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "UCFL212 at 60 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 250 mm centre height and binds the insert.", "The standard 2-series insert in UCFL212 is the lightest section at 60 mm — do not substitute it into a position that previously ran an X or 3 unit: the 202 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL212 pulls against the frame through only two M20 bolts on 202 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL212 locked to the shaft, and how tight should the setscrews be?", "a": "The UC212D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL212 instead of a pillow block?", "a": "Choose the UCFL212 two-bolt flange when the 60 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 202 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL212 mounted bearing?", "a": "UCFL212 takes a 60 mm shaft (insert UC212D1, 110 mm OD) and has a unit mass of about 3.8 kg. Flange figures: height H 250 mm, length L 140 mm, bolt centres J 202 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL212 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 60 mm bore. UCFL212 is built from housing FL212 plus insert UC212D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL312", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 60, "D_mm": 130, "B_mm": 71, "seal_type": "2RS", "dynamic_load_kN": 90.5, "static_load_kN": 52, "fatigue_load_limit_kN": 4.1, "weight_g": 5700, "housing_height_mm": 270, "base_length_mm": 160, "bolt_spacing_mm": 212, "bolt_size_mm": 31, "manufacturer_designation": "UCFL312", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL312" ], "naming_rule_text": "NTN delivers UCFL312 as a matched unit — the UC312D1 insert is locked into the FL312 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL312 means the FL312 housing carrying the UC312D1 insert, with the last two digits denoting the 60 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 270 mm flange height, L 160 mm across the ears, J 212 mm between the 31 mm holes, and a 60 mm shaft through the 130 mm OD UC312D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC312D1 insert are 90.5 kN dynamic and 52 kN static; the assembled UCFL312 weighs about 5.7 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL312 pulls against the frame through only two M27 bolts on 212 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "At replacement time, measure the 60 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL312 creep identically to the old one.", "UCFL312 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 60 mm journal over time.", "At 60 mm bore the 160 mm base of UCFL312 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCFL312 the highest-rated unit at 60 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCFL312 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 60 mm bore. UCFL312 is built from housing FL312 plus insert UC312D1 (D1 = greasable)." }, { "q": "How is UCFL312 locked to the shaft, and how tight should the setscrews be?", "a": "The UC312D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL312 instead of a pillow block?", "a": "Choose the UCFL312 two-bolt flange when the 60 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M27 bolts on 212 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL312 bearing self-aligning?", "a": "Yes within limits. The UC312D1 insert has a spherical outer diameter that pivots in the FL312 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL312 mounted bearing?", "a": "UCFL312 takes a 60 mm shaft (insert UC312D1, 130 mm OD) and has a unit mass of about 5.7 kg. Flange figures: height H 270 mm, length L 160 mm, bolt centres J 212 mm, holes 31 mm for M27 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL213", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 65, "D_mm": 120, "B_mm": 65.1, "seal_type": "2RS", "dynamic_load_kN": 63.5, "static_load_kN": 40, "fatigue_load_limit_kN": 3.15, "weight_g": 4800, "housing_height_mm": 258, "base_length_mm": 155, "bolt_spacing_mm": 210, "bolt_size_mm": 23, "manufacturer_designation": "UCFL213", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL213" ], "naming_rule_text": "NTN delivers UCFL213 as a matched unit — the UC213D1 insert is locked into the FL213 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL213 means the FL213 housing carrying the UC213D1 insert, with the last two digits denoting the 65 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 258 mm flange height, L 155 mm across the ears, J 210 mm between the 23 mm holes, and a 65 mm shaft through the 120 mm OD UC213D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC213D1 insert are 63.5 kN dynamic and 40 kN static; the assembled UCFL213 weighs about 4.8 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL213 pulls against the frame through only two M20 bolts on 210 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "At replacement time, measure the 65 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCFL213 creep identically to the old one.", "UCFL213 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 65 mm journal over time.", "Heavy drives on UCFL213 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCFL213 is the lightest section at 65 mm — do not substitute it into a position that previously ran an X or 3 unit: the 210 mm mounting may match while the load rating does not." ], "faq": [ { "q": "What does the UCFL213 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 65 mm bore. UCFL213 is built from housing FL213 plus insert UC213D1 (D1 = greasable)." }, { "q": "How is UCFL213 locked to the shaft, and how tight should the setscrews be?", "a": "The UC213D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL213 instead of a pillow block?", "a": "Choose the UCFL213 two-bolt flange when the 65 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 210 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL213 bearing self-aligning?", "a": "Yes within limits. The UC213D1 insert has a spherical outer diameter that pivots in the FL213 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL213 mounted bearing?", "a": "UCFL213 takes a 65 mm shaft (insert UC213D1, 120 mm OD) and has a unit mass of about 4.8 kg. Flange figures: height H 258 mm, length L 155 mm, bolt centres J 210 mm, holes 23 mm for M20 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL213", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL313", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 65, "D_mm": 140, "B_mm": 75, "seal_type": "2RS", "dynamic_load_kN": 103, "static_load_kN": 60, "fatigue_load_limit_kN": 4.6, "weight_g": 7500, "housing_height_mm": 295, "base_length_mm": 175, "bolt_spacing_mm": 240, "bolt_size_mm": 31, "manufacturer_designation": "UCFL313", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL313" ], "naming_rule_text": "UCFL313 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC313D1 insert in a JIS B 1559 FL313 housing. On the nameplate, UCFL313 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 65 mm bore; the UC313D1 designation shows the D1 greasable execution. Boundary data for the 65 mm bore: 295 mm high flange, 175 mm long over the rhombus, 240 mm hole centres for M27 fasteners through 31 mm holes; insert OD is 140 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC313D1 insert are 103 kN dynamic and 60 kN static; the assembled UCFL313 weighs about 7.5 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The 3-series insert makes UCFL313 the highest-rated unit at 65 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL313 pulls against the frame through only two M27 bolts on 240 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC313D1 insert of UCFL313 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "UCFL313 at 65 mm uses M27 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 295 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCFL313 mounted bearing?", "a": "UCFL313 takes a 65 mm shaft (insert UC313D1, 140 mm OD) and has a unit mass of about 7.5 kg. Flange figures: height H 295 mm, length L 175 mm, bolt centres J 240 mm, holes 31 mm for M27 bolts." }, { "q": "What does the UCFL313 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 65 mm bore. UCFL313 is built from housing FL313 plus insert UC313D1 (D1 = greasable)." }, { "q": "How is UCFL313 locked to the shaft, and how tight should the setscrews be?", "a": "The UC313D1 insert uses two collar setscrews on the 65 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL313 instead of a pillow block?", "a": "Choose the UCFL313 two-bolt flange when the 65 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M27 bolts on 240 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL214", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 70, "D_mm": 125, "B_mm": 74.6, "seal_type": "2RS", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "weight_g": 5400, "housing_height_mm": 265, "base_length_mm": 160, "bolt_spacing_mm": 216, "bolt_size_mm": 23, "manufacturer_designation": "UCFL214", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL214" ], "naming_rule_text": "UCFL214 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC214D1 insert in a JIS B 1559 FL214 housing. On the nameplate, UCFL214 decodes as a UC wide-inner-ring insert in a FL diamond flange, 2-series duty, 70 mm bore; the UC214D1 designation shows the D1 greasable execution. Boundary data for the 70 mm bore: 265 mm high flange, 160 mm long over the rhombus, 216 mm hole centres for M20 fasteners through 23 mm holes; insert OD is 125 mm. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC214D1 insert are 69 kN dynamic and 44 kN static; the assembled UCFL214 weighs about 5.4 kg.", "applications": [ "cement and clinker handling", "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "washdown-duty food and pharmaceutical areas using purge relubrication" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "The standard 2-series insert in UCFL214 is the lightest section at 70 mm — do not substitute it into a position that previously ran an X or 3 unit: the 216 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL214 pulls against the frame through only two M20 bolts on 216 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC214D1 insert of UCFL214 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 70 mm bore the 160 mm base of UCFL214 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCFL214 mounted bearing?", "a": "UCFL214 takes a 70 mm shaft (insert UC214D1, 125 mm OD) and has a unit mass of about 5.4 kg. Flange figures: height H 265 mm, length L 160 mm, bolt centres J 216 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL214 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 70 mm bore. UCFL214 is built from housing FL214 plus insert UC214D1 (D1 = greasable)." }, { "q": "How is UCFL214 locked to the shaft, and how tight should the setscrews be?", "a": "The UC214D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL214 instead of a pillow block?", "a": "Choose the UCFL214 two-bolt flange when the 70 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 216 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL314", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 70, "D_mm": 150, "B_mm": 78, "seal_type": "2RS", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "weight_g": 8600, "housing_height_mm": 315, "base_length_mm": 185, "bolt_spacing_mm": 250, "bolt_size_mm": 35, "manufacturer_designation": "UCFL314", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL314" ], "naming_rule_text": "For a 70 mm shaft ending at or passing through a vertical frame face, NTN UCFL314 is the diamond-flange answer: UC314D1 insert inside the FL314 cast-iron housing. The UCFL314 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 70 mm; FL314 and UC314D1 are the separate housing and insert part numbers inside. Shaft size is 70 mm; the 315 mm overall-height flange is 185 mm long across the rhombus (L), with its two mounting holes on 250 mm centres (J) clearing 35 mm M30 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Textile and fibre-processing machines use these units on long line-shafting; several bearings share one shaft, and the self-aligning feature prevents one poor bracket from loading its neighbours. A film of anti-seize on the spherical surfaces at assembly prevents fretting corrosion welding insert to housing — the failure mode that turns a five-minute insert swap into a housing replacement. Basic ratings of the UC314D1 insert are 115 kN dynamic and 68 kN static; the assembled UCFL314 weighs about 8.6 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCFL314, note the steel and cast-iron cover executions change the unit mass and envelope but not the 250 mm mounting centres.", "Heavy drives on UCFL314 should have the setscrews re-torqued after the first day; at 70 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The 3-series insert makes UCFL314 the highest-rated unit at 70 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL314 pulls against the frame through only two M30 bolts on 250 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFL314 with a bare UC314D1 bearing: replacing only the insert is possible, but the housing FL314 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL314 instead of a pillow block?", "a": "Choose the UCFL314 two-bolt flange when the 70 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M30 bolts on 250 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL314 unit carry?", "a": "The UC314D1 insert is rated at 115 kN dynamic and 68 kN basic static (fatigue load limit 5.1 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL314 mounted bearing?", "a": "UCFL314 takes a 70 mm shaft (insert UC314D1, 150 mm OD) and has a unit mass of about 8.6 kg. Flange figures: height H 315 mm, length L 185 mm, bolt centres J 250 mm, holes 35 mm for M30 bolts." }, { "q": "What does the UCFL314 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 70 mm bore. UCFL314 is built from housing FL314 plus insert UC314D1 (D1 = greasable)." }, { "q": "How is UCFL314 locked to the shaft, and how tight should the setscrews be?", "a": "The UC314D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL215", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 75, "D_mm": 130, "B_mm": 77.8, "seal_type": "2RS", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "weight_g": 6000, "housing_height_mm": 275, "base_length_mm": 165, "bolt_spacing_mm": 225, "bolt_size_mm": 23, "manufacturer_designation": "UCFL215", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL215" ], "naming_rule_text": "For a 75 mm shaft ending at or passing through a vertical frame face, NTN UCFL215 is the diamond-flange answer: UC215D1 insert inside the FL215 cast-iron housing. The UCFL215 number follows NTN's mounted-unit convention: housing letter FL, 2-series section, bore code for 75 mm; FL215 and UC215D1 are the separate housing and insert part numbers inside. Shaft size is 75 mm; the 275 mm overall-height flange is 165 mm long across the rhombus (L), with its two mounting holes on 225 mm centres (J) clearing 23 mm M20 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC215D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCFL215 weighs about 6.0 kg.", "applications": [ "sugar-mill and fertiliser plant drives", "heavy bulk-handling conveyors", "process fans and induced-draft drives", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first" ], "pitfalls": [ "When ordering covers for UCFL215, note the steel and cast-iron cover executions change the unit mass and envelope but not the 225 mm mounting centres.", "UCFL215 at 75 mm uses M20 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 275 mm centre height and binds the insert.", "The standard 2-series insert in UCFL215 is the lightest section at 75 mm — do not substitute it into a position that previously ran an X or 3 unit: the 225 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL215 pulls against the frame through only two M20 bolts on 225 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Do not confuse UCFL215 with a bare UC215D1 bearing: replacing only the insert is possible, but the housing FL215 must be unworn and the spherical seat cleaned and coated with anti-seize." ], "faq": [ { "q": "When should I choose a rhombus flange unit like UCFL215 instead of a pillow block?", "a": "Choose the UCFL215 two-bolt flange when the 75 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M20 bolts on 225 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What loads can the UCFL215 unit carry?", "a": "The UC215D1 insert is rated at 73.5 kN dynamic and 49.5 kN basic static (fatigue load limit 3.8 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately." }, { "q": "What are the dimensions of an UCFL215 mounted bearing?", "a": "UCFL215 takes a 75 mm shaft (insert UC215D1, 130 mm OD) and has a unit mass of about 6.0 kg. Flange figures: height H 275 mm, length L 165 mm, bolt centres J 225 mm, holes 23 mm for M20 bolts." }, { "q": "What does the UCFL215 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 75 mm bore. UCFL215 is built from housing FL215 plus insert UC215D1 (D1 = greasable)." }, { "q": "How is UCFL215 locked to the shaft, and how tight should the setscrews be?", "a": "The UC215D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL315", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 75, "D_mm": 160, "B_mm": 82, "seal_type": "2RS", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "weight_g": 9800, "housing_height_mm": 320, "base_length_mm": 195, "bolt_spacing_mm": 260, "bolt_size_mm": 35, "manufacturer_designation": "UCFL315", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL315" ], "naming_rule_text": "UCFL315 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC315D1 ball bearing insert pre-assembled in a FL315 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 75 mm bore. Key mounting figures: flange height H = 320 mm, overall length L = 195 mm across the diamond, bolt centres J = 260 mm, and each ear takes a 35 mm (M30) fastener for the 75 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC315D1 insert are 126 kN dynamic and 77 kN static; the assembled UCFL315 weighs about 9.8 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCFL315 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 75 mm journal over time.", "At 75 mm bore the 195 mm base of UCFL315 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCFL315 the highest-rated unit at 75 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL315 pulls against the frame through only two M30 bolts on 260 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL315 locked to the shaft, and how tight should the setscrews be?", "a": "The UC315D1 insert uses two collar setscrews on the 75 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL315 instead of a pillow block?", "a": "Choose the UCFL315 two-bolt flange when the 75 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M30 bolts on 260 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL315 mounted bearing?", "a": "UCFL315 takes a 75 mm shaft (insert UC315D1, 160 mm OD) and has a unit mass of about 9.8 kg. Flange figures: height H 320 mm, length L 195 mm, bolt centres J 260 mm, holes 35 mm for M30 bolts." }, { "q": "What does the UCFL315 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 75 mm bore. UCFL315 is built from housing FL315 plus insert UC315D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL216", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 80, "D_mm": 140, "B_mm": 82.6, "seal_type": "2RS", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "weight_g": 7400, "housing_height_mm": 290, "base_length_mm": 180, "bolt_spacing_mm": 233, "bolt_size_mm": 25, "manufacturer_designation": "UCFL216", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL216" ], "naming_rule_text": "UCFL216 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC216D1 ball bearing insert pre-assembled in a FL216 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 2 code identifies the duty series and the final two digits encode the 80 mm bore. Key mounting figures: flange height H = 290 mm, overall length L = 180 mm across the diamond, bolt centres J = 233 mm, and each ear takes a 25 mm (M22) fastener for the 80 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC216D1 insert are 80.5 kN dynamic and 53 kN static; the assembled UCFL216 weighs about 7.4 kg.", "applications": [ "heavy bulk-handling conveyors", "process fans and induced-draft drives", "quarry feeder and transfer drives", "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "UCFL216 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 80 mm journal over time.", "Heavy drives on UCFL216 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.", "The standard 2-series insert in UCFL216 is the lightest section at 80 mm — do not substitute it into a position that previously ran an X or 3 unit: the 233 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL216 pulls against the frame through only two M22 bolts on 233 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL216 locked to the shaft, and how tight should the setscrews be?", "a": "The UC216D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL216 instead of a pillow block?", "a": "Choose the UCFL216 two-bolt flange when the 80 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 233 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL216 mounted bearing?", "a": "UCFL216 takes a 80 mm shaft (insert UC216D1, 140 mm OD) and has a unit mass of about 7.4 kg. Flange figures: height H 290 mm, length L 180 mm, bolt centres J 233 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL216 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 80 mm bore. UCFL216 is built from housing FL216 plus insert UC216D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL316", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 80, "D_mm": 170, "B_mm": 86, "seal_type": "2RS", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "weight_g": 13000, "housing_height_mm": 355, "base_length_mm": 210, "bolt_spacing_mm": 285, "bolt_size_mm": 38, "manufacturer_designation": "UCFL316", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL316" ], "naming_rule_text": "The NTN UCFL316 flanged unit combines a sealed UC316D1 insert with a diamond-shaped FL316 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 80 mm shaft size; the unit is built from insert UC316D1 and housing FL316. For the frame-face drawing of UCFL316: the two holes are 285 mm apart (J), the rhombus spans 210 mm (L) and 355 mm (H), and M33 (38 mm) bolts clamp it around the 80 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC316D1 insert are 136 kN dynamic and 86.5 kN static; the assembled UCFL316 weighs about 13.0 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The 3-series insert makes UCFL316 the highest-rated unit at 80 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL316 pulls against the frame through only two M33 bolts on 285 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL316 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the FL316 housing of UCFL316: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "UCFL316 at 80 mm uses M33 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 355 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCFL316 mounted bearing?", "a": "UCFL316 takes a 80 mm shaft (insert UC316D1, 170 mm OD) and has a unit mass of about 13.0 kg. Flange figures: height H 355 mm, length L 210 mm, bolt centres J 285 mm, holes 38 mm for M33 bolts." }, { "q": "What does the UCFL316 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 80 mm bore. UCFL316 is built from housing FL316 plus insert UC316D1 (D1 = greasable)." }, { "q": "How is UCFL316 locked to the shaft, and how tight should the setscrews be?", "a": "The UC316D1 insert uses two collar setscrews on the 80 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL316 instead of a pillow block?", "a": "Choose the UCFL316 two-bolt flange when the 80 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 285 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL316 unit?", "a": "There is no single interval for UCFL316: the UC316D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL217", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 85, "D_mm": 150, "B_mm": 85.7, "seal_type": "2RS", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "weight_g": 8800, "housing_height_mm": 305, "base_length_mm": 190, "bolt_spacing_mm": 248, "bolt_size_mm": 25, "manufacturer_designation": "UCFL217", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL217" ], "naming_rule_text": "The NTN UCFL217 flanged unit combines a sealed UC217D1 insert with a diamond-shaped FL217 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 2, bore code ending in the 85 mm shaft size; the unit is built from insert UC217D1 and housing FL217. For the frame-face drawing of UCFL217: the two holes are 248 mm apart (J), the rhombus spans 190 mm (L) and 305 mm (H), and M22 (25 mm) bolts clamp it around the 85 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC217D1 insert are 92 kN dynamic and 64 kN static; the assembled UCFL217 weighs about 8.8 kg.", "applications": [ "process fans and induced-draft drives", "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear" ], "pitfalls": [ "The standard 2-series insert in UCFL217 is the lightest section at 85 mm — do not substitute it into a position that previously ran an X or 3 unit: the 248 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL217 pulls against the frame through only two M22 bolts on 248 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The lip seals and slingers on UCFL217 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.", "Never weld a bracket to the FL217 housing of UCFL217: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "At 85 mm bore the 190 mm base of UCFL217 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet." ], "faq": [ { "q": "What are the dimensions of an UCFL217 mounted bearing?", "a": "UCFL217 takes a 85 mm shaft (insert UC217D1, 150 mm OD) and has a unit mass of about 8.8 kg. Flange figures: height H 305 mm, length L 190 mm, bolt centres J 248 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL217 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 85 mm bore. UCFL217 is built from housing FL217 plus insert UC217D1 (D1 = greasable)." }, { "q": "How is UCFL217 locked to the shaft, and how tight should the setscrews be?", "a": "The UC217D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL217 instead of a pillow block?", "a": "Choose the UCFL217 two-bolt flange when the 85 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 248 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "How often should I relubricate an UCFL217 unit?", "a": "There is no single interval for UCFL217: the UC217D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL317", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 85, "D_mm": 180, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "weight_g": 15000, "housing_height_mm": 370, "base_length_mm": 220, "bolt_spacing_mm": 300, "bolt_size_mm": 38, "manufacturer_designation": "UCFL317", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL317" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL317 is the two-bolt rhombus flange option for a 85 mm shaft: insert UC317D1, housing FL317, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL317 means the FL317 housing carrying the UC317D1 insert, with the last two digits denoting the 85 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 370 mm flange height, L 220 mm across the ears, J 300 mm between the 38 mm holes, and a 85 mm shaft through the 180 mm OD UC317D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC317D1 insert are 147 kN dynamic and 97 kN static; the assembled UCFL317 weighs about 15.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "The 3-series insert makes UCFL317 the highest-rated unit at 85 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL317 pulls against the frame through only two M33 bolts on 300 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL317, note the steel and cast-iron cover executions change the unit mass and envelope but not the 300 mm mounting centres.", "Heavy drives on UCFL317 should have the setscrews re-torqued after the first day; at 85 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks." ], "faq": [ { "q": "What are the dimensions of an UCFL317 mounted bearing?", "a": "UCFL317 takes a 85 mm shaft (insert UC317D1, 180 mm OD) and has a unit mass of about 15.0 kg. Flange figures: height H 370 mm, length L 220 mm, bolt centres J 300 mm, holes 38 mm for M33 bolts." }, { "q": "What does the UCFL317 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 85 mm bore. UCFL317 is built from housing FL317 plus insert UC317D1 (D1 = greasable)." }, { "q": "How is UCFL317 locked to the shaft, and how tight should the setscrews be?", "a": "The UC317D1 insert uses two collar setscrews on the 85 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL317 instead of a pillow block?", "a": "Choose the UCFL317 two-bolt flange when the 85 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 300 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL218", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 90, "D_mm": 160, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "weight_g": 11000, "housing_height_mm": 320, "base_length_mm": 205, "bolt_spacing_mm": 265, "bolt_size_mm": 25, "manufacturer_designation": "UCFL218", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL218" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL218 is the two-bolt rhombus flange option for a 90 mm shaft: insert UC218D1, housing FL218, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL218 means the FL218 housing carrying the UC218D1 insert, with the last two digits denoting the 90 mm bore in the 2-series duty class. The mounting detail needs four numbers: H 320 mm flange height, L 205 mm across the ears, J 265 mm between the 25 mm holes, and a 90 mm shaft through the 160 mm OD UC218D1 insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC218D1 insert are 106 kN dynamic and 71.5 kN static; the assembled UCFL218 weighs about 11.0 kg.", "applications": [ "quarry feeder and transfer drives", "sawmill arbors and feed rolls", "cement and clinker handling", "fan drives where belt tension, not transmitted torque, sets the radial load" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "The standard 2-series insert in UCFL218 is the lightest section at 90 mm — do not substitute it into a position that previously ran an X or 3 unit: the 265 mm mounting may match while the load rating does not.", "As a rhombus flange, UCFL218 pulls against the frame through only two M22 bolts on 265 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL218, note the steel and cast-iron cover executions change the unit mass and envelope but not the 265 mm mounting centres.", "UCFL218 at 90 mm uses M22 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 320 mm centre height and binds the insert." ], "faq": [ { "q": "What are the dimensions of an UCFL218 mounted bearing?", "a": "UCFL218 takes a 90 mm shaft (insert UC218D1, 160 mm OD) and has a unit mass of about 11.0 kg. Flange figures: height H 320 mm, length L 205 mm, bolt centres J 265 mm, holes 25 mm for M22 bolts." }, { "q": "What does the UCFL218 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 2 is the duty series; the last digits encode the 90 mm bore. UCFL218 is built from housing FL218 plus insert UC218D1 (D1 = greasable)." }, { "q": "How is UCFL218 locked to the shaft, and how tight should the setscrews be?", "a": "The UC218D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL218 instead of a pillow block?", "a": "Choose the UCFL218 two-bolt flange when the 90 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M22 bolts on 265 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL318", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 90, "D_mm": 190, "B_mm": 96, "seal_type": "2RS", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "weight_g": 17000, "housing_height_mm": 385, "base_length_mm": 235, "bolt_spacing_mm": 315, "bolt_size_mm": 38, "manufacturer_designation": "UCFL318", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL318" ], "naming_rule_text": "NTN delivers UCFL318 as a matched unit — the UC318D1 insert is locked into the FL318 rhombus cast-iron flange at the factory and arrives greased and sealed. On the nameplate, UCFL318 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 90 mm bore; the UC318D1 designation shows the D1 greasable execution. Boundary data for the 90 mm bore: 385 mm high flange, 235 mm long over the rhombus, 315 mm hole centres for M33 fasteners through 38 mm holes; insert OD is 190 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC318D1 insert are 158 kN dynamic and 107 kN static; the assembled UCFL318 weighs about 17.0 kg.", "applications": [ "sawmill arbors and feed rolls", "cement and clinker handling", "sugar-mill and fertiliser plant drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit" ], "pitfalls": [ "The D1 suffix on UC318D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL318 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC318D1 insert of UCFL318 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 90 mm bore the 235 mm base of UCFL318 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.", "The 3-series insert makes UCFL318 the highest-rated unit at 90 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL318 pulls against the frame through only two M33 bolts on 315 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL318 locked to the shaft, and how tight should the setscrews be?", "a": "The UC318D1 insert uses two collar setscrews on the 90 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL318 instead of a pillow block?", "a": "Choose the UCFL318 two-bolt flange when the 90 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 315 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Can I replace just the insert inside an UCFL318 unit?", "a": "Yes — UCFL318 is an assembly of the FL318 housing and UC318D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 90 mm shaft are not the reason the old insert failed." }, { "q": "What are the dimensions of an UCFL318 mounted bearing?", "a": "UCFL318 takes a 90 mm shaft (insert UC318D1, 190 mm OD) and has a unit mass of about 17.0 kg. Flange figures: height H 385 mm, length L 235 mm, bolt centres J 315 mm, holes 38 mm for M33 bolts." }, { "q": "What does the UCFL318 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 90 mm bore. UCFL318 is built from housing FL318 plus insert UC318D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL319", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 95, "D_mm": 200, "B_mm": 103, "seal_type": "2RS", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "weight_g": 23000, "housing_height_mm": 405, "base_length_mm": 250, "bolt_spacing_mm": 330, "bolt_size_mm": 41, "manufacturer_designation": "UCFL319", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL319" ], "naming_rule_text": "UCFL319 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC319D1 insert in a JIS B 1559 FL319 housing. The UCFL319 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 95 mm; FL319 and UC319D1 are the separate housing and insert part numbers inside. Shaft size is 95 mm; the 405 mm overall-height flange is 250 mm long across the rhombus (L), with its two mounting holes on 330 mm centres (J) clearing 41 mm M36 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC319D1 insert are 169 kN dynamic and 119 kN static; the assembled UCFL319 weighs about 23.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "Never weld a bracket to the FL319 housing of UCFL319: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "XL units like UCFL319 (95 mm bore, M36 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCFL319 the highest-rated unit at 95 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL319 pulls against the frame through only two M36 bolts on 330 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL319 locked to the shaft, and how tight should the setscrews be?", "a": "The UC319D1 insert uses two collar setscrews on the 95 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL319 instead of a pillow block?", "a": "Choose the UCFL319 two-bolt flange when the 95 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M36 bolts on 330 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL319 mounted bearing?", "a": "UCFL319 takes a 95 mm shaft (insert UC319D1, 200 mm OD) and has a unit mass of about 23.0 kg. Flange figures: height H 405 mm, length L 250 mm, bolt centres J 330 mm, holes 41 mm for M36 bolts." }, { "q": "What does the UCFL319 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 95 mm bore. UCFL319 is built from housing FL319 plus insert UC319D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL320", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 100, "D_mm": 215, "B_mm": 108, "seal_type": "2RS", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "weight_g": 26000, "housing_height_mm": 440, "base_length_mm": 270, "bolt_spacing_mm": 360, "bolt_size_mm": 44, "manufacturer_designation": "UCFL320", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL320" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL320 is the two-bolt rhombus flange option for a 100 mm shaft: insert UC320D1, housing FL320, through-bolt mounting. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 100 mm shaft size; the unit is built from insert UC320D1 and housing FL320. For the frame-face drawing of UCFL320: the two holes are 360 mm apart (J), the rhombus spans 270 mm (L) and 440 mm (H), and M39 (44 mm) bolts clamp it around the 100 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC320D1 insert are 192 kN dynamic and 141 kN static; the assembled UCFL320 weighs about 26.0 kg.", "applications": [ "steel-plant roller tables", "large induced-draft fans", "quarry and aggregate screens", "frequent stop-start and reversing duty such as shuttle and tripper conveyors" ], "failure_modes": [ "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in", "insert brinelling from hammer mounting or from belt tension applied to a stationary unit", "over-greasing that churns the charge, overheats the bearing and blows the seal lip" ], "pitfalls": [ "The 3-series insert makes UCFL320 the highest-rated unit at 100 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL320 pulls against the frame through only two M39 bolts on 360 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL320, note the steel and cast-iron cover executions change the unit mass and envelope but not the 360 mm mounting centres.", "Foundation design for UCFL320 must resist the belt-pull reaction at 440 mm centre height — a moment arm this large walks an inadequately anchored base under load." ], "faq": [ { "q": "What are the dimensions of an UCFL320 mounted bearing?", "a": "UCFL320 takes a 100 mm shaft (insert UC320D1, 215 mm OD) and has a unit mass of about 26.0 kg. Flange figures: height H 440 mm, length L 270 mm, bolt centres J 360 mm, holes 44 mm for M39 bolts." }, { "q": "What does the UCFL320 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 100 mm bore. UCFL320 is built from housing FL320 plus insert UC320D1 (D1 = greasable)." }, { "q": "How is UCFL320 locked to the shaft, and how tight should the setscrews be?", "a": "The UC320D1 insert uses two collar setscrews on the 100 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL320 instead of a pillow block?", "a": "Choose the UCFL320 two-bolt flange when the 100 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 360 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL320", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL321", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 105, "D_mm": 225, "B_mm": 112, "seal_type": "2RS", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "weight_g": 27000, "housing_height_mm": 440, "base_length_mm": 270, "bolt_spacing_mm": 360, "bolt_size_mm": 44, "manufacturer_designation": "UCFL321", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL321" ], "naming_rule_text": "NTN delivers UCFL321 as a matched unit — the UC321D1 insert is locked into the FL321 rhombus cast-iron flange at the factory and arrives greased and sealed. NTN's numbering ties the unit to its components: UCFL321 means the FL321 housing carrying the UC321D1 insert, with the last two digits denoting the 105 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 440 mm flange height, L 270 mm across the ears, J 360 mm between the 44 mm holes, and a 105 mm shaft through the 225 mm OD UC321D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC321D1 insert are 204 kN dynamic and 153 kN static; the assembled UCFL321 weighs about 27.0 kg.", "applications": [ "large induced-draft fans", "quarry and aggregate screens", "ship-loader and stacker drives", "low-speed heavily loaded pulleys where the static rating governs the selection" ], "failure_modes": [ "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward" ], "pitfalls": [ "As a rhombus flange, UCFL321 pulls against the frame through only two M39 bolts on 360 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "The D1 suffix on UC321D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCFL321 on site accepts relubrication.", "Self-aligning is not the same as free to move: the UC321D1 insert of UCFL321 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 105 mm bore, rigging and alignment dominate the UCFL321 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.", "The 3-series insert makes UCFL321 the highest-rated unit at 105 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims." ], "faq": [ { "q": "What does the UCFL321 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 105 mm bore. UCFL321 is built from housing FL321 plus insert UC321D1 (D1 = greasable)." }, { "q": "How is UCFL321 locked to the shaft, and how tight should the setscrews be?", "a": "The UC321D1 insert uses two collar setscrews on the 105 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL321 instead of a pillow block?", "a": "Choose the UCFL321 two-bolt flange when the 105 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 360 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "Is the UCFL321 bearing self-aligning?", "a": "Yes within limits. The UC321D1 insert has a spherical outer diameter that pivots in the FL321 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running." }, { "q": "What are the dimensions of an UCFL321 mounted bearing?", "a": "UCFL321 takes a 105 mm shaft (insert UC321D1, 225 mm OD) and has a unit mass of about 27.0 kg. Flange figures: height H 440 mm, length L 270 mm, bolt centres J 360 mm, holes 44 mm for M39 bolts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL321", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL322", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 110, "D_mm": 240, "B_mm": 117, "seal_type": "2RS", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "weight_g": 34000, "housing_height_mm": 470, "base_length_mm": 300, "bolt_spacing_mm": 390, "bolt_size_mm": 44, "manufacturer_designation": "UCFL322", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL322" ], "naming_rule_text": "UCFL322 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC322D1 insert in a JIS B 1559 FL322 housing. On the nameplate, UCFL322 decodes as a UC wide-inner-ring insert in a FL diamond flange, 3-series duty, 110 mm bore; the UC322D1 designation shows the D1 greasable execution. Boundary data for the 110 mm bore: 470 mm high flange, 300 mm long over the rhombus, 390 mm hole centres for M39 fasteners through 44 mm holes; insert OD is 240 mm. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC322D1 insert are 227 kN dynamic and 179 kN static; the assembled UCFL322 weighs about 34.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "cold-store and winter-outdoor service needing low-temperature grease" ], "failure_modes": [ "housing-foot cracking beside an over-torqued or under-supported foundation bolt", "grease starvation on long intervals in hot positions, with the ball set running on dried thickener", "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep" ], "pitfalls": [ "Never weld a bracket to the FL322 housing of UCFL322: local heat cracks cast iron and distorts the spherical bore that the insert depends on.", "XL units like UCFL322 (110 mm bore, M39 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.", "The 3-series insert makes UCFL322 the highest-rated unit at 110 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL322 pulls against the frame through only two M39 bolts on 390 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL322 locked to the shaft, and how tight should the setscrews be?", "a": "The UC322D1 insert uses two collar setscrews on the 110 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL322 instead of a pillow block?", "a": "Choose the UCFL322 two-bolt flange when the 110 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M39 bolts on 390 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL322 mounted bearing?", "a": "UCFL322 takes a 110 mm shaft (insert UC322D1, 240 mm OD) and has a unit mass of about 34.0 kg. Flange figures: height H 470 mm, length L 300 mm, bolt centres J 390 mm, holes 44 mm for M39 bolts." }, { "q": "What does the UCFL322 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 110 mm bore. UCFL322 is built from housing FL322 plus insert UC322D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL322", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL324", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 120, "D_mm": 260, "B_mm": 126, "seal_type": "2RS", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "weight_g": 48000, "housing_height_mm": 520, "base_length_mm": 330, "bolt_spacing_mm": 430, "bolt_size_mm": 47, "manufacturer_designation": "UCFL324", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL324" ], "naming_rule_text": "UCFL324 is an NTN two-bolt rhombus flanged unit — a setscrew-locking UC324D1 ball bearing insert pre-assembled in a FL324 cast-iron flange housing. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; FL marks the two-bolt rhombus flange housing; the 3 code identifies the duty series and the final two digits encode the 120 mm bore. Key mounting figures: flange height H = 520 mm, overall length L = 330 mm across the diamond, bolt centres J = 430 mm, and each ear takes a 47 mm (M42) fastener for the 120 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. On industrial centrifugal fans this size is standard at both shaft ends; fan loads are light but belt tension is not, and the cast housing dissipates the heat conducted out of the insert. Shim under the feet, never file the sole: full-area shim packs on both sides keep the bolt clamp load spread across the base, while a single thin shim pivots the housing and preloads the bearing. Basic ratings of the UC324D1 insert are 229 kN dynamic and 185 kN static; the assembled UCFL324 weighs about 48.0 kg.", "applications": [ "mining and port conveyor pulleys", "primary crusher feeders", "steel-plant roller tables", "elevated-temperature positions where grease life, not bearing rating, sets the interval" ], "failure_modes": [ "spherical-seat fretting that welds insert to housing and destroys the self-aligning action", "water-emulsified grease after washdown with the fitting facing upward", "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in" ], "pitfalls": [ "The 3-series insert makes UCFL324 the highest-rated unit at 120 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL324 pulls against the frame through only two M42 bolts on 430 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "Self-aligning is not the same as free to move: the UC324D1 insert of UCFL324 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.", "At 120 mm bore, rigging and alignment dominate the UCFL324 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted." ], "faq": [ { "q": "What are the dimensions of an UCFL324 mounted bearing?", "a": "UCFL324 takes a 120 mm shaft (insert UC324D1, 260 mm OD) and has a unit mass of about 48.0 kg. Flange figures: height H 520 mm, length L 330 mm, bolt centres J 430 mm, holes 47 mm for M42 bolts." }, { "q": "What does the UCFL324 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 120 mm bore. UCFL324 is built from housing FL324 plus insert UC324D1 (D1 = greasable)." }, { "q": "How is UCFL324 locked to the shaft, and how tight should the setscrews be?", "a": "The UC324D1 insert uses two collar setscrews on the 120 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL324 instead of a pillow block?", "a": "Choose the UCFL324 two-bolt flange when the 120 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M42 bolts on 430 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL326", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 130, "D_mm": 280, "B_mm": 135, "seal_type": "2RS", "dynamic_load_kN": 254, "static_load_kN": 214, "fatigue_load_limit_kN": 11.7, "weight_g": 58000, "housing_height_mm": 550, "base_length_mm": 360, "bolt_spacing_mm": 460, "bolt_size_mm": 47, "manufacturer_designation": "UCFL326", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL326" ], "naming_rule_text": "In NTN's mounted-bearing range, UCFL326 is the two-bolt rhombus flange option for a 130 mm shaft: insert UC326D1, housing FL326, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL326 means the FL326 housing carrying the UC326D1 insert, with the last two digits denoting the 130 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 550 mm flange height, L 360 mm across the ears, J 460 mm between the 47 mm holes, and a 130 mm shaft through the 280 mm OD UC326D1 insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC326D1 insert are 254 kN dynamic and 214 kN static; the assembled UCFL326 weighs about 58.0 kg.", "applications": [ "steel-plant roller tables", "large induced-draft fans", "quarry and aggregate screens", "vibrating feeder and screen-adjacent positions where setscrew retorque is routine" ], "failure_modes": [ "over-greasing that churns the charge, overheats the bearing and blows the seal lip", "cracked cast ear from mounting on an uneven face and pulling one bolt fully first", "housing-foot cracking beside an over-torqued or under-supported foundation bolt" ], "pitfalls": [ "UCFL326 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 130 mm journal over time.", "Foundation design for UCFL326 must resist the belt-pull reaction at 550 mm centre height — a moment arm this large walks an inadequately anchored base under load.", "The 3-series insert makes UCFL326 the highest-rated unit at 130 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL326 pulls against the frame through only two M42 bolts on 460 mm centres; the mounting plate must be stiff enough not to bend between them under belt load." ], "faq": [ { "q": "How is UCFL326 locked to the shaft, and how tight should the setscrews be?", "a": "The UC326D1 insert uses two collar setscrews on the 130 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL326 instead of a pillow block?", "a": "Choose the UCFL326 two-bolt flange when the 130 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M42 bolts on 460 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." }, { "q": "What are the dimensions of an UCFL326 mounted bearing?", "a": "UCFL326 takes a 130 mm shaft (insert UC326D1, 280 mm OD) and has a unit mass of about 58.0 kg. Flange figures: height H 550 mm, length L 360 mm, bolt centres J 460 mm, holes 47 mm for M42 bolts." }, { "q": "What does the UCFL326 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 130 mm bore. UCFL326 is built from housing FL326 plus insert UC326D1 (D1 = greasable)." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL326", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] }, { "sku": "UCFL328", "brand": "NTN", "series": "UCFL-series", "type": "pillow_block", "d_mm": 140, "D_mm": 300, "B_mm": 145, "seal_type": "2RS", "dynamic_load_kN": 280, "static_load_kN": 246, "fatigue_load_limit_kN": 13, "weight_g": 81000, "housing_height_mm": 600, "base_length_mm": 400, "bolt_spacing_mm": 500, "bolt_size_mm": 51, "manufacturer_designation": "UCFL328", "standard": "JIS B 1559", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "UCFL328" ], "naming_rule_text": "UCFL328 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC328D1 insert in a JIS B 1559 FL328 housing. The UCFL328 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 140 mm; FL328 and UC328D1 are the separate housing and insert part numbers inside. Shaft size is 140 mm; the 600 mm overall-height flange is 400 mm long across the rhombus (L), with its two mounting holes on 500 mm centres (J) clearing 51 mm M45 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC328D1 insert are 280 kN dynamic and 246 kN static; the assembled UCFL328 weighs about 81.0 kg.", "applications": [ "quarry and aggregate screens", "ship-loader and stacker drives", "mining and port conveyor pulleys", "long line-shafting where several units must share a straight reference" ], "failure_modes": [ "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep", "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear", "spherical-seat fretting that welds insert to housing and destroys the self-aligning action" ], "pitfalls": [ "The 3-series insert makes UCFL328 the highest-rated unit at 140 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.", "As a rhombus flange, UCFL328 pulls against the frame through only two M45 bolts on 500 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.", "When ordering covers for UCFL328, note the steel and cast-iron cover executions change the unit mass and envelope but not the 500 mm mounting centres.", "XL units like UCFL328 (140 mm bore, M45 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking." ], "faq": [ { "q": "What are the dimensions of an UCFL328 mounted bearing?", "a": "UCFL328 takes a 140 mm shaft (insert UC328D1, 300 mm OD) and has a unit mass of about 81.0 kg. Flange figures: height H 600 mm, length L 400 mm, bolt centres J 500 mm, holes 51 mm for M45 bolts." }, { "q": "What does the UCFL328 designation mean?", "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 140 mm bore. UCFL328 is built from housing FL328 plus insert UC328D1 (D1 = greasable)." }, { "q": "How is UCFL328 locked to the shaft, and how tight should the setscrews be?", "a": "The UC328D1 insert uses two collar setscrews on the 140 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated." }, { "q": "When should I choose a rhombus flange unit like UCFL328 instead of a pillow block?", "a": "Choose the UCFL328 two-bolt flange when the 140 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M45 bolts on 500 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25", "cross_ref": [ { "equiv_sku": "UCFL328", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ] } ]