NUP2238 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 NUP2238 model number is decoded

NUP2238 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 190×340×92 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 340 mm OD and 92 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,700 r/min grease and 2,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Selection arithmetic: Pu 117 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.40 (1290/920 kN) shows the high-static-capacity proportioning of this 190 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 NUP2238.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NUP2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
• Do not replace NUP2238 with a deep-groove ball bearing on rating alone: line contact gives 920 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 920/1290 kN pair here belongs to NUP2238 as printed, not to the bare size.
• The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.
• If the shaft must be located both ways, do not use NUP2238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
• The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2238 (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.