7040-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 7040-BGM model number is decoded

7040 BGM is SKF's 200 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 200×310×51 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 200×310×51 mm (7.874×12.205×2.008 in), 55.0 mm radial section height, C 225 kN, C0 290 kN, Pu 7.8 kN.reference speed 2,200 r/min (thermal) and limiting speed 2,200 r/min (mechanical), which coincide for this size, catalogue mass 18000 g. The 7.8 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 225/290 kN ratings and 18000 g mass this execution carries about 1.13 kN of C per millimetre of bore. Mass and section check: 18000 g inside the 200×310×51 mm outline leaves a 55.0 mm radial section, and the 290 kN static rating is 1.29× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 2,200 r/min against a 2,200 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. 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

• 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.
• One 7040-BGM 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.
• At 200 mm bore the m6 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 51 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• The steep 40° angle of 7040-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 7040 BGM as the single g brass execution; the other order numbers of the 7040 size are different products and may carry different ratings — always quote the full designation when purchasing.