7318-BEGAPH 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-BEGAPH model number is decoded

7318 BEGAPH 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. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. 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 4,500 r/min (mechanical), catalogue mass 5200 g. Mass and section check: 5200 g inside the 90×190×43 mm outline leaves a 50.0 mm radial section, and the 146 kN static rating is 0.88× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 630k 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. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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.
• One 7318-BEGAPH 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.
• Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.
• 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-BEGAPH 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 BEGAPH 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.