7038-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 7038-BGM model number is decoded

7038 BGM is SKF's 190 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 190×290×46 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 190×290×46 mm (7.48×11.417×1.811 in), 50.0 mm radial section height, C 199 kN, C0 255 kN, Pu 6.95 kN.reference speed 2,400 r/min (thermal) and limiting speed 2,400 r/min (mechanical), which coincide for this size, catalogue mass 10500 g. Envelope economics: the 46 mm width over a 50.0 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 10500 g for 199 kN of dynamic capacity — about 53 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 2,400 r/min while thermal balance under catalogue load sets the 2,400 r/min reference; at dm ≈ 240.0 mm the corresponding dn is approximately 576k mm·r/min. Bore-to-OD planning: OD 290 over bore 190 is a 1.53× step for this size, and the 46 mm width gives a bore/width ratio of 4.13; use these ratios when housing space around the 190 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

• Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.
• Fillet radii must clear the chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• 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.
• Greased positions should fill roughly 25–35 % of the free volume on a 7038-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• The steep 40° angle of 7038-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 7038 BGM as the single g brass execution; the other order numbers of the 7038 size are different products and may carry different ratings — always quote the full designation when purchasing.