7328-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 7328-BCBM model number is decoded

7328 BCBM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 140×300×62 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 140×300×62 mm (5.512×11.811×2.441 in), 80.0 mm radial section height, C 302 kN, C0 345 kN, Pu 9.8 kN.reference speed 2,600 r/min (thermal) and limiting speed 3,000 r/min (mechanical), catalogue mass 21500 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,000 r/min while thermal balance under catalogue load sets the 2,600 r/min reference; at dm ≈ 220.0 mm the corresponding dn is approximately 660k mm·r/min. Selection figures for 7328 BCBM: the static-to-dynamic ratio C0/C is 1.14, Pu 9.8 kN is about 3 % of C, and catalogue mass works out to roughly 154 g per millimetre of bore. Bore-to-OD planning: OD 300 over bore 140 is a 2.14× step for this size, and the 62 mm width gives a bore/width ratio of 2.26; use these ratios when housing space around the 140 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

• Fillet radii must clear the chamfer so the 62 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.
• Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.
• At 140 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.
• The steep 40° angle of 7328-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.