7318-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 7318-BECBM model number is decoded

7318 BECBM is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 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 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 166 kN, C0 146 kN, Pu 5.3 kN.reference speed 4,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 5200 g. Selection figures for 7318 BECBM: the static-to-dynamic ratio C0/C is 0.88, Pu 5.3 kN is about 3 % of C, and catalogue mass works out to roughly 58 g per millimetre of bore. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 784k mm·r/min; the 4,300 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 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

• Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.
• Greased positions should fill roughly 25–35 % of the free volume on a 7318-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• 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 k5 on a 90 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 7318-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.