NCF2336-ECJB-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 NCF2336-ECJB-PEX model number is decoded

For a 180 mm shaft, SKF lists NCF2336-ECJB-PEX as high-capacity cylindrical roller: 380 mm OD, 126 mm wide, Pu 232 kN, the catalogue lists 1,800 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 1960 kN and C0 2400 kN, size the bearing on the 180×380 mm ISO 15 envelope and check the 232 kN Pu against the equivalent-load floor; the catalogue lists 1,800 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. 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 1960 kN / C0 2400 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2336-ECJB-PEX as a separate service part: do not substitute the standard NCF 2336 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 NCF 2336 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.
• Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 126 mm-wide ring and concentrates load.
• Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
• The 1960/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification.