7321-DECBM 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 7321-DECBM model number is decoded

7321 DECBM is SKF's 105 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 105×225×49 mm to the ISO dimension plan. D marks a two-piece inner ring (split for mounting), E the optimized internal geometry, CB universal matching with Normal clearance and M the machined brass ball-centred cage. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. Envelope 105×225×49 mm (4.134×8.858×1.929 in), 60.0 mm radial section height, C 216 kN, C0 208 kN, Pu 6.95 kN.reference speed 3,600 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 8550 g. Sizing arithmetic on the 105 mm bore: 216 kN C divided by the 60.0 mm radial section height gives 3.6 kN per section millimetre; the 8550 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 49 mm width over a 60.0 mm section yields 0.82 mm of ring width per section millimetre, and the bearing weighs 8550 g for 216 kN of dynamic capacity — about 40 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 4,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.75. Split-inner-ring universal execution: the leading D means the inner ring is supplied in two halves to ease mounting and inspection of the rolling elements; E optimized internals, CB Normal-clearance set faces and the machined brass M cage complete the order number.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Greased positions should fill roughly 25–35 % of the free volume on a 7321-DECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• Preload the set against a calculated stand-off dimension — the ground faces of DECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.
• Assign interference to the rotating ring — roughly m6 on a 105 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.
• 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.
• The steep 40° angle of 7321-DECBM 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.
• Universally matchable DECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure.