NU2356 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 NU2356 model number is decoded

For pure radial duty on a 280 mm shaft NTN supplies NU2356: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 920 r/min on grease and 1,100 r/min on oil. Digit by digit, NU2356 reads as NU (outer ring ribbed, inner ring ribless), 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 175 mm width and 150.0 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 920 r/min is .84 of the 1,100 r/min oil value for NU2356; grease-churn heating closes that gap as fill quantity rises. 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 1,100 r/min need positive flow and drain design; the 218000 g NU2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Do not replace NU2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to NU2356 as printed, not to the bare size.
• Do not replace NU2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
• Open NU2356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.
• The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2356 (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.