NJ2244 bearing: complete specifications & equivalents
The NJ2244 is a ISO 15 radial bearing sized 220 x 400 x 108 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 220 mm |
| Outer diameter D | 400 mm |
| Width B | 108 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1260 kN |
| Basic static load rating C0 | 1810 kN |
| Fatigue load limit Pu | 157 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 57800 g |
| Manufacturer designation | NTN NJ2244 |
| 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 | 8.661 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 4.252 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 90 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) | 29 of 34 |
| Bore above smallest NJ2200-series size | 203 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJ2244-ECML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 220×400×108 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 NJ2244 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, NJ2244 appears as a 220 mm bore single-row cylindrical roller bearing (1260 kN C / 1810 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,500 r/min grease and 1,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Speed ratio check: limiting 1,500 r/min is .88 of the 1,700 r/min oil value for NJ2244; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.
Typical equipment & failure modes
Common applications
- mining SAG/ball-mill drive shafts
- offshore drawworks and winch drums
- heavy press and large gearbox main shafts
- rolling-mill work-roll and backup-roll positions
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- 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
- rolling-contact fatigue after the catalogue L10 life is exceeded
- electrical pitting on VFD-driven motor shafts without grounding protection
Selection pitfalls — read before you substitute
- At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NJ2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.
- If the shaft must be located both ways, do not use NJ2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- If the shaft must be located both ways, do not use NJ2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2244 (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 NJ2244?
NJ2244 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 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. NJ2244 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. NJ2244 is supplied in the standard open execution shown in the table.
Can NJ2244 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 NJ2244?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 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.