7224-BM 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 7224-BM model number is decoded

7224 BM is SKF's 120 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 120×215×40 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. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.. Envelope 120×215×40 mm (4.724×8.465×1.575 in), 47.5 mm radial section height, C 165 kN, C0 163 kN, Pu 5.3 kN.reference speed 3,600 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 5900 g. At the printed limiting speed of 4,000 r/min the mean pitch diameter dm ≈ 167.5 mm implies a dn value around 670k mm·r/min; the 3,600 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min while thermal balance under catalogue load sets the 3,600 r/min reference; at dm ≈ 167.5 mm the corresponding dn is approximately 670k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.90. Non-optimized basic execution: BM is the earlier 40-degree design without the E internal upgrade, fitted with a machined brass ball-centred cage as a single (non-universal) bearing; quote it for housings and spacers designed around the legacy geometry.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not mix execution classes inside one set: a universally matchable BM unit is ground for arbitrary pairing, a basic execution is not.
• Fillet radii must clear the chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• Fillet radii must clear the chamfer so the 40 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 7224-BM 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 7224-BM 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 7224 BM as the single non e brass execution; the other order numbers of the 7224 size are different products and may carry different ratings — always quote the full designation when purchasing.