7310 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB); 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 7310 model number is decoded

In SKF catalogue PUB BU/P1 17000, 7310 appears as 7310 BECBP: a 40° contact-angle, open, one-direction-thrust ball bearing in the medium (7300) series, supplied with a glass-fibre PA66 cage as standard.Numbering ties the bearing to its envelope: 7310 means angular-contact type 7, medium section section 3, 50 mm bore — which is why the 110×27 mm outline swaps dimensionally with a 6310, though the load behaviour does not. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. CB means the side faces are ground for universal matching with Normal internal axial clearance, which is the starting point for field-set preload rather than a factory-matched fixed-preload set. Catalogue mass 1100 g for the 50×110×27 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7310 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7310 pair heats, loses preload control and smears the raceways.
• The 73xx medium section at 50 mm bore (110×27 mm) is heavier-rated than the 7210 but runs hotter at the same speed; do not substitute a 7310 into a 72-series spindle position without re-checking dn, lubricant film and preload.
• At the 75 kN rating of 7310, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,000 r/min speed end and heavier preload only where moment stiffness dominates.
• Do not mix execution classes inside one 7310 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.
• Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 75/51 kN ratings are SKF catalogue 17000 values for the 7310 BECBP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
• SKF lists several executions of 7310 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7310 BECBP designation when purchasing and match the execution to the mounting arrangement.
• The CB execution (7310 BECBP) ships prepared for pair mounting but is not a matched set by itself: preload results from how the pair is clamped, so follow the SKF stand-off-ring and nut-torque procedure rather than assuming the bearings arrive preloaded.