7028-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 7028-BGM model number is decoded

7028 BGM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 140×210×33 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 140×210×33 mm (5.512×8.268×1.299 in), 35.0 mm radial section height, C 114 kN, C0 129 kN, Pu 4.15 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), which coincide for this size, catalogue mass 3850 g. Mass and section check: 3850 g inside the 140×210×33 mm outline leaves a 35.0 mm radial section, and the 129 kN static rating is 1.13× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 4.15 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 114/129 kN ratings and 3850 g mass this execution carries about 0.81 kN of C per millimetre of bore. Bore-to-OD planning: OD 210 over bore 140 is a 1.50× step for this size, and the 33 mm width gives a bore/width ratio of 4.24; use these ratios when housing space around the 140 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

• Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.
• Fillet radii must clear the chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• Greased positions should fill roughly 25–35 % of the free volume on a 7028-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.
• The steep 40° angle of 7028-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 7028 BGM as the single g brass execution; the other order numbers of the 7028 size are different products and may carry different ratings — always quote the full designation when purchasing.