NCF2340-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 NCF2340-ECJB model number is decoded

For a 200 mm shaft, SKF lists NCF2340-ECJB as high-capacity cylindrical roller: 420 mm OD, 138 mm wide, Pu 300 kN, the catalogue lists 1,400 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. 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. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 11.00 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 3200 kN for static checks such as crane hook blocks standing under load. 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 2340 using the /PEX loads.
• Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
• Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.
• The 2200/3200 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.