NJ2352 bearing: complete specifications & equivalents
The NJ2352 is a ISO 15 radial bearing sized 260 x 540 x 165 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 | 540 mm |
| Width B | 165 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2600 kN |
| Basic static load rating C0 | 3600 kN |
| Fatigue load limit Pu | 289 kN |
| Limiting speed (mechanical) | 1000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 178000 g |
| Manufacturer designation | NTN NJ2352 |
| 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 & NJ2300-series range
| Bore d | 10.236 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 6.496 in |
| ISO bore code | 52 |
| Radial section height (D−d)/2 | 140 mm |
| Smallest bore in NJ2300-series | 20 mm |
| Largest outer diameter in NJ2300-series | 580 mm |
| Width range across NJ2300-series | 21–175 mm |
| Bore position in NJ2300-series (smallest first) | 30 of 31 |
| Bore above smallest NJ2300-series size | 240 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJ2352-ECMA | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 260×540×165 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 NJ2352 model number is decoded
For pure radial duty on a 260 mm shaft NTN supplies NJ2352: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Digit by digit, NJ2352 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. 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 NJ2352. Mass 178000 g for the 260×540×165 mm NJ2352 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.
Typical equipment & failure modes
Common applications
- offshore drawworks and winch drums
- heavy press and large gearbox main shafts
- rolling-mill work-roll and backup-roll positions
- large turbine and generator rotor bearings
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
- grease starvation and cage drag when relubrication intervals are extended past the grease life
- false brinelling on standby machines exposed to external vibration
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NJ2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Grease limiting speed 1,000 r/min and oil 1,200 r/min are different limits for NJ2352: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2352 skids at 1,000 r/min and fails by smearing long before L10 fatigue.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.
- The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2352 (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 NJ2352?
NJ2352 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 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. NJ2352 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. NJ2352 is supplied in the standard open execution shown in the table.
Can NJ2352 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 NJ2352?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 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.