7318-BEM 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-BEM model number is decoded

7318 BEM 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. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 156 kN, C0 134 kN, Pu 4.8 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,300 r/min (mechanical), which coincide for this size, catalogue mass 5200 g. Selection figures for 7318 BEM: the static-to-dynamic ratio C0/C is 0.86, Pu 4.8 kN is about 3 % of C, and catalogue mass works out to roughly 58 g per millimetre of bore. Load balance: C0 134 kN against C 156 kN gives a 0.86 ratio, typical of a steep-angle axial-oriented design; Pu 4.8 kN enters the SKF adjusted-life equation rather than the basic rating life. 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. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not mix execution classes inside one set: a universally matchable BEM unit is ground for arbitrary pairing, a basic execution is not.
• 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.
• At 90 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.
• 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.
• The steep 40° angle of 7318-BEM 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.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 7318 BEM as the single basic machined brass execution; the other order numbers of the 7318 size are different products and may carry different ratings — always quote the full designation when purchasing.