7056-BGM 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 7056-BGM model number is decoded

7056 BGM is SKF's 280 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 280×420×65 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. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 280×420×65 mm (11.024×16.535×2.559 in), 70.0 mm radial section height, C 338 kN, C0 540 kN, Pu 12.2 kN.reference speed 1,600 r/min (thermal) and limiting speed 1,600 r/min (mechanical), which coincide for this size, catalogue mass 30000 g. Envelope economics: the 65 mm width over a 70.0 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 30000 g for 338 kN of dynamic capacity — about 89 g per rated kN. At the printed limiting speed of 1,600 r/min the mean pitch diameter dm ≈ 350.0 mm implies a dn value around 560k mm·r/min; the 1,600 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 420 over bore 280 is a 1.50× step for this size, and the 65 mm width gives a bore/width ratio of 4.31; use these ratios when housing space around the 280 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Greased positions should fill roughly 25–35 % of the free volume on a 7056-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• Greased positions should fill roughly 25–35 % of the free volume on a 7056-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• Fillet radii must clear the chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• Preload the set against a calculated stand-off dimension — the ground faces of BGM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.
• The steep 40° angle of 7056-BGM 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 7056 BGM as the single g brass execution; the other order numbers of the 7056 size are different products and may carry different ratings — always quote the full designation when purchasing.