NUP409 bearing: complete specifications & equivalents
The NUP409 is a ISO 15 radial bearing sized 45 x 120 x 29 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45 mm |
| Outer diameter D | 120 mm |
| Width B | 29 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 102 kN |
| Fatigue load limit Pu | 12.4 kN |
| Limiting speed (mechanical) | 5100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1580 g |
| Manufacturer designation | NTN NUP409 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 1.142 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 37.5 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) | 5 of 12 |
| Bore above smallest NUP400-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NUP409 | 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 NUP409 model number is decoded
For pure radial duty on a 45 mm shaft NTN supplies NUP409: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 5,100 r/min on grease and 6,000 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 45 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP409 designation when purchasing. Selection arithmetic: Pu 12.4 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.86 (102/119 kN) shows the high-static-capacity proportioning of this 45 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP409.
Typical equipment & failure modes
Common applications
- medium electric-motor and generator shafts
- pump and compressor crankshafts and rotors
- machine-tool gearbox and spindle radial sets
- material-handling drum and wheel shafts
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- 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
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
- rolling-contact fatigue after the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP409.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP409 skids at 5,100 r/min and fails by smearing long before L10 fatigue.
- Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NUP400 series code before substituting, because housing and shoulder geometry will not interchange.
- The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.
- The 29 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 45 mm inner ring.
- The 119/102 kN ratings, 12.4 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP409 (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 NUP409?
NUP409 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 45 mm bore, 120 mm OD and 29 mm width (1.772 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 102 kN, Pu 12.4 kN, grease limiting speed 5,100 r/min, oil 6,000 r/min, mass about 1580 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. NUP409 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. NUP409 is supplied in the standard open execution shown in the table.
Can NUP409 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 NUP409?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 100.5 mm. The nominal bore/OD remain 45/120 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 5,100 r/min grease / 6,000 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.