7338-BCBM bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 7338-BCBM model number is decoded

7338 BCBM is SKF's 190 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 190×400×78 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 190×400×78 mm (7.48×15.748×3.071 in), 105.0 mm radial section height, C 442 kN, C0 600 kN, Pu 14.6 kN.reference speed 2,000 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 48500 g. The 14.6 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 442/600 kN ratings and 48500 g mass this execution carries about 2.33 kN of C per millimetre of bore. Load balance: C0 600 kN against C 442 kN gives a 1.36 ratio, typical of a steep-angle axial-oriented design; Pu 14.6 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 400 over bore 190 is a 2.11× step for this size, and the 78 mm width gives a bore/width ratio of 2.44; use these ratios when housing space around the 190 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.
• Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.
• Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.
• Assign interference to the rotating ring — roughly m6 on a 190 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.
• The steep 40° angle of 7338-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.
• Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure.