NUP228 bearing: complete specifications & equivalents
The NUP228 is a ISO 15 radial bearing sized 140 x 250 x 42 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 140 mm |
| Outer diameter D | 250 mm |
| Width B | 42 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 345 kN |
| Basic static load rating C0 | 400 kN |
| Fatigue load limit Pu | 39.5 kN |
| Limiting speed (mechanical) | 2700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7720 g |
| Manufacturer designation | NTN NUP228 |
| 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 & NUP200-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 1.654 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 55 mm |
| Smallest bore in NUP200-series | 17 mm |
| Largest outer diameter in NUP200-series | 580 mm |
| Width range across NUP200-series | 12–92 mm |
| Bore position in NUP200-series (smallest first) | 23 of 35 |
| Bore above smallest NUP200-series size | 123 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NUP228-ECJ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×250×42 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 NUP228 model number is decoded
The NTN order number NUP228 denotes a 140×250×42 mm (5.512 × 9.843 × 1.654 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. Digit by digit, NUP228 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP228 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,100 r/min for continuously high-duty 140 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP228.
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
- pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant
- grease starvation and cage drag when relubrication intervals are extended past the grease life
- fretting corrosion on a loose rotating shaft seat
- hard-particle indentation of raceways in unfiltered oil or open arrangements
Selection pitfalls — read before you substitute
- At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NUP228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.
- Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for NUP228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.
- Do not replace NUP228 with a deep-groove ball bearing on rating alone: line contact gives 345 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.
- The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP228 (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 NUP228?
NUP228 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 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. NUP228 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions.
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. NUP228 is supplied in the standard open execution shown in the table.
Can NUP228 take axial load and locate a shaft?
the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing.
What do Fw and Ew mean for NUP228?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 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.