7208-BECBM 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 7208-BECBM model number is decoded

7208 BECBM is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 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. E marks the optimized internal design with an enhanced ball complement and race geometry. 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 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 36.5 kN, C0 26 kN, Pu 1.1 kN.reference speed 10,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 370 g. At the printed limiting speed of 13,000 r/min the mean pitch diameter dm ≈ 60.0 mm implies a dn value around 780k mm·r/min; the 10,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 18 mm width over a 20.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 370 g for 36.5 kN of dynamic capacity — about 10 g per rated kN. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Fillet radii must clear the chamfer so the 18 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.
• 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.
• At 40 mm bore the k5 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 7208-BECBM 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 BECBM 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.