NJ2234 bearing: complete specifications & equivalents
The NJ2234 is a ISO 15 radial bearing sized 170 x 310 x 86 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 310 mm |
| Width B | 86 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 795 kN |
| Basic static load rating C0 | 1080 kN |
| Fatigue load limit Pu | 101 kN |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 26700 g |
| Manufacturer designation | NTN NJ2234 |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 3.386 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 70 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) | 25 of 34 |
| Bore above smallest NJ2200-series size | 153 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJ2234-ECML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 170×310×86 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 NJ2234 model number is decoded
The NTN order number NJ2234 denotes a 170×310×86 mm (6.693 × 12.205 × 3.386 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2234 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. 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
- ship propulsion line shafts and reduction gears
- mining SAG/ball-mill drive shafts
- offshore drawworks and winch drums
- heavy press and large gearbox main 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
- electrical pitting on VFD-driven motor shafts without grounding protection
- false brinelling on standby machines exposed to external vibration
Selection pitfalls — read before you substitute
- At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NJ2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The 70.0 mm section at 170 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 86 mm-wide cavity.
- Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NJ2234: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 70.0 mm section at 170 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 86 mm-wide cavity.
- The 86 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 170 mm inner ring.
- The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2234 (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 NJ2234?
NJ2234 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 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. NJ2234 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. NJ2234 is supplied in the standard open execution shown in the table.
Can NJ2234 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 NJ2234?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 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.