NCF2234-ECJB 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 NCF2234-ECJB model number is decoded

Ordering number SKF NCF 2234 ECJB resolves to a 170×310×86 mm high-capacity cylindrical roller bearing (dimension series 22 (light-section, wide)); 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. Structurally, the NCF design has 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. In arrangement terms it is 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: 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 1160 kN and C0 1530 kN, size the bearing on the 170×310 mm ISO 15 envelope and check the 156 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Assembly note: 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. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.

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 execution carries its own rating line and internal geometry — never substitute a standard NCF 2234 using the /PEX loads.
• Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
• Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.
• The 1160/1530 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification.