NUP2310 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 NUP2310 model number is decoded

NTN lists NUP2310 on the 50×110 mm envelope, 40 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 5,700 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2310 floats or locates; the numeric remainder is the ISO 15 series and 50 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2310 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 16 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.98 (131/134 kN) shows the high-static-capacity proportioning of this 50 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2310 non-locating position preloads the bearing when the shaft grows.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 50 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NUP2310.
• Do not replace NUP2310 with a deep-groove ball bearing on rating alone: line contact gives 134 kN radial capacity but the bearing only accepts small sustained axial guidance loads 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 134/131 kN pair here belongs to NUP2310 as printed, not to the bare size.
• The 40 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 50 mm inner ring.
• Do not replace NUP2310 with a deep-groove ball bearing on rating alone: line contact gives 134 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.
• The 134/131 kN ratings, 16 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2310 (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.