NUH2338-ECMH-PEX bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.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 NUH2338-ECMH-PEX model number is decoded

For a 190 mm shaft, SKF lists NUH2338-ECMH-PEX as high-capacity cylindrical roller: 400 mm OD, 132 mm wide, Pu 255 kN, the catalogue lists 1,700 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The NUH configuration means a high-capacity NJ-type execution whose displaced cage bars make room for additional rollers, with two integral flanges on the inner ring; functionally the bearing is the locating partner in paired cross-locating arrangements for heavily loaded shafts, locating axially in one direction. Reading the order-string suffix ECMH/PEX: the high-capacity execution with a machined brass cage (the /PEX variant is the pinion-shaft special build). Selection arithmetic: C0/C ≈ 1.23 (2750 against 2240 kN), and the Pu figure 255 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,700 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NUH2338-ECMH-PEX: typically paired with the matching NCF ECJB non-locating bearing on the same shaft; observe the catalogue shoulder and fillet data for the large inner ring. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2240 kN / C0 2750 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NUH2338-ECMH-PEX as a separate service part: do not substitute the standard NUH 2338 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.
• The /PEX pinion build and the standard NUH 2338 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.
• Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.
• Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.
• The 2240/2750 kN ratings are SKF catalogue 17000 (2018) values for the ECMH/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification.