NJ2210 bearing: complete specifications & equivalents
The NJ2210 is a ISO 15 radial bearing sized 50 x 90 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50 mm |
| Outer diameter D | 90 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 71 kN |
| Basic static load rating C0 | 73.5 kN |
| Fatigue load limit Pu | 9 kN |
| Limiting speed (mechanical) | 6900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 560 g |
| Manufacturer designation | NTN NJ2210 |
| 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 & NJ2200-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.906 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in NJ2200-series | 17 mm |
| Largest outer diameter in NJ2200-series | 580 mm |
| Width range across NJ2200-series | 16–150 mm |
| Bore position in NJ2200-series (smallest first) | 8 of 34 |
| Bore above smallest NJ2200-series size | 33 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJ2210-ECP | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 NJ2210 model number is decoded
NTN lists NJ2210 on the 50×90 mm envelope, 23 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 6,900 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 50 mm (00–03 use the 10/12/15/17 exception table). At 8,100 r/min with oil versus 6,900 r/min with grease (a 1,200 r/min band), lubrication choice for NJ2210 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 9 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.04 (73.5/71 kN) shows the high-static-capacity proportioning of this 50 mm bore. Heat the inner ring to max 120 °C for the 50 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.
Typical equipment & failure modes
Common applications
- industrial gearbox input and output shafts
- medium electric-motor and generator shafts
- pump and compressor crankshafts and rotors
- machine-tool gearbox and spindle radial sets
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- electrical pitting on VFD-driven motor shafts without grounding protection
- rolling-contact fatigue after the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- On this 50 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 NJ2210.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2210 skids at 6,900 r/min and fails by smearing long before L10 fatigue.
- Grease limiting speed 6,900 r/min and oil 8,100 r/min are different limits for NJ2210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2210 skids at 6,900 r/min and fails by smearing long before L10 fatigue.
- Grease limiting speed 6,900 r/min and oil 8,100 r/min are different limits for NJ2210: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 71/73.5 kN ratings, 9 kN Pu and 560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2210 (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 NJ2210?
NJ2210 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 71 kN, C0 73.5 kN, Pu 9 kN, grease limiting speed 6,900 r/min, oil 8,100 r/min, mass about 560 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. NJ2210 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction.
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. NJ2210 is listed among the ＊ ULTAGE-marked executions in 2203E.
Can NJ2210 take axial load and locate a shaft?
the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings.
What do Fw and Ew mean for NJ2210?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 60.4 mm, Ew 80.4 mm. The nominal bore/OD remain 50/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 6,900 r/min grease / 8,100 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.