7211-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 7211-BECBM model number is decoded

7211 BECBM is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 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 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 49 kN, C0 40 kN, Pu 1.66 kN.reference speed 8,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 620 g. Envelope economics: the 21 mm width over a 22.5 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 620 g for 49 kN of dynamic capacity — about 13 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 77.5 mm the corresponding dn is approximately 775k mm·r/min. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 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

• One 7211-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.
• One 7211-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.
• At 55 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.
• Greased positions should fill roughly 25–35 % of the free volume on a 7211-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• The steep 40° angle of 7211-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.