7211-ACCBM 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-ACCBM model number is decoded

7211 ACCBM is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 55×100×21 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. 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. 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 57 kN, C0 45 kN, Pu 1.9 kN.reference speed 8,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 620 g. Selection figures for 7211 ACCBM: the static-to-dynamic ratio C0/C is 0.79, Pu 1.9 kN is about 3 % of C, and catalogue mass works out to roughly 11 g per millimetre of bore. At the printed limiting speed of 12,000 r/min the mean pitch diameter dm ≈ 77.5 mm implies a dn value around 930k mm·r/min; the 8,500 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 8,500 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.71. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.
• 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.
• Fillet radii must clear the chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• Assign interference to the rotating ring — roughly k5 on a 55 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 25° AC angle of 7211-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.
• Universally matchable ACCBM 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.