NUP415 bearing: complete specifications & equivalents
The NUP415 is a ISO 15 radial bearing sized 75 x 190 x 45 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 75 mm |
| Outer diameter D | 190 mm |
| Width B | 45 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 291 kN |
| Basic static load rating C0 | 274 kN |
| Fatigue load limit Pu | 30.5 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6060 g |
| Manufacturer designation | NTN NUP415 |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & NUP400-series range
| Bore d | 2.953 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 1.772 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 57.5 mm |
| Smallest bore in NUP400-series | 25 mm |
| Largest outer diameter in NUP400-series | 200 mm |
| Width range across NUP400-series | 21–48 mm |
| Bore position in NUP400-series (smallest first) | 11 of 12 |
| Bore above smallest NUP400-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NUP415 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the NUP415 model number is decoded
NUP415 is the heavy (04) section of the NTN NUP400 dimension series for a 75 mm shaft — 291 kN of basic dynamic capacity in a 6060 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP415 floats or locates; the numeric remainder is the ISO 15 series and 75 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP415. Selection arithmetic: Pu 30.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.94 (274/291 kN) shows the high-static-capacity proportioning of this 75 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP415; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.
Typical equipment & failure modes
Common applications
- large pump, turbine and compressor rotors
- rolling-mill auxiliary drive shafts
- crusher and vibrating-screen drive shafts
- marine gearbox and deck-machinery shafts
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- cage distortion after a mounting blow carried through the roller set
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- false brinelling on standby machines exposed to external vibration
- false brinelling on standby machines exposed to external vibration
Selection pitfalls — read before you substitute
- Induction-heat the 75 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 190 mm raceway.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP415 skids at 3,200 r/min and fails by smearing long before L10 fatigue.
- Do not replace NUP415 with a deep-groove ball bearing on rating alone: line contact gives 291 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.
- Do not replace NUP415 with a deep-groove ball bearing on rating alone: line contact gives 291 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 190 mm race brinells and releases as vibration within hours.
- The 291/274 kN ratings, 30.5 kN Pu and 6060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP415 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives.
Frequently asked questions
What are the dimensions and catalogue data of NUP415?
NUP415 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 75 mm bore, 190 mm OD and 45 mm width (2.953 × 7.48 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 291 kN, C0 274 kN, Pu 30.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 6060 g. It is open, with a pressed sheet-steel cage.
What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?
The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP415 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions.
What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?
EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP415 is supplied in the standard open execution shown in the table.
Can NUP415 take axial load and locate a shaft?
the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing.
What do Fw and Ew mean for NUP415?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 104.5 mm, Ew 160.5 mm. The nominal bore/OD remain 75/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.