NJ2252 bearing: complete specifications & equivalents
The NJ2252 is a ISO 15 radial bearing sized 260 x 480 x 130 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 260 mm |
| Outer diameter D | 480 mm |
| Width B | 130 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1980 kN |
| Basic static load rating C0 | 2930 kN |
| Fatigue load limit Pu | 241 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 102000 g |
| Manufacturer designation | NTN NJ2252 |
| 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 | 10.236 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 5.118 in |
| ISO bore code | 52 |
| Radial section height (D−d)/2 | 110 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) | 31 of 34 |
| Bore above smallest NJ2200-series size | 243 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJ2252-MA | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 260×480×130 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 NJ2252 model number is decoded
NTN lists NJ2252 on the 260×480 mm envelope, 130 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. Selection arithmetic: Pu 241 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.48 (2930/1980 kN) shows the high-static-capacity proportioning of this 260 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2252 non-locating position preloads the bearing when the shaft grows.
Typical equipment & failure modes
Common applications
- large turbine and generator rotor bearings
- wind-turbine gearbox planet and rotor shafts
- ship propulsion line shafts and reduction gears
- mining SAG/ball-mill drive shafts
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
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
Selection pitfalls — read before you substitute
- At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NJ2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 480×130 mm envelope matches.
- The 110.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.
- The 130 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 260 mm inner ring.
- If the shaft must be located both ways, do not use NJ2252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2252 (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 NJ2252?
NJ2252 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 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. NJ2252 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. NJ2252 is supplied in the standard open execution shown in the table.
Can NJ2252 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 NJ2252?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 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.