NUP2356 bearing: complete specifications & equivalents
The NUP2356 is a ISO 15 radial bearing sized 280 x 580 x 175 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 280 mm |
| Outer diameter D | 580 mm |
| Width B | 175 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 3000 kN |
| Basic static load rating C0 | 4250 kN |
| Fatigue load limit Pu | 335 kN |
| Limiting speed (mechanical) | 920 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 218000 g |
| Manufacturer designation | NTN NUP2356 |
| 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 & NUP2300-series range
| Bore d | 11.024 in |
|---|---|
| Outer diameter D | 22.835 in |
| Width B | 6.89 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 150 mm |
| Smallest bore in NUP2300-series | 20 mm |
| Largest outer diameter in NUP2300-series | 580 mm |
| Width range across NUP2300-series | 21–175 mm |
| Bore position in NUP2300-series (smallest first) | 31 of 31 |
| Bore above smallest NUP2300-series size | 260 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NUP2356 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 NUP2356 model number is decoded
NUP2356 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 3000 kN dynamic rating in the 280 mm bore. Digit by digit, NUP2356 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2356 designation when purchasing. Selection arithmetic: Pu 335 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.42 (4250/3000 kN) shows the high-static-capacity proportioning of this 280 mm bore. 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 NUP2356.
Typical equipment & failure modes
Common applications
- rolling-mill work-roll and backup-roll positions
- large turbine and generator rotor bearings
- wind-turbine gearbox planet and rotor shafts
- ship propulsion line shafts and reduction gears
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
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- hard-particle indentation of raceways in unfiltered oil or open arrangements
- false brinelling on standby machines exposed to external vibration
Selection pitfalls — read before you substitute
- At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NUP2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Do not replace NUP2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.
- The NUP rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 580×175 mm envelope matches.
- If the shaft must be located both ways, do not use NUP2356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The 175 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 280 mm inner ring.
- The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2356 (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 NUP2356?
NUP2356 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 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. NUP2356 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. NUP2356 is supplied in the standard open execution shown in the table.
Can NUP2356 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 NUP2356?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 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.