NUP2256 bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 NUP2256 model number is decoded

For pure radial duty on a 280 mm shaft NTN supplies NUP2256: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,100 r/min on grease and 1,300 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2256 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2256 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 130 mm-wide ring. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NUP2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2050/3100 kN pair here belongs to NUP2256 as printed, not to the bare size.
• Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.
• Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.
• Do not replace NUP2256 with a deep-groove ball bearing on rating alone: line contact gives 2050 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.
• The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2256 (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.