7307 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 7307 model number is decoded

Ordering number 7307 BEP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 35 mm shaft, medium (7300) series, with an open PA66-caged execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 7307 means angular-contact type 7, medium section section 3, 35 mm bore — which is why the 80×21 mm outline swaps dimensionally with a 6307, though the load behaviour does not. Suffix letters after 7307 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. With C 39 kN and C0 24.5 kN, the 7307 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 10,000 r/min. A single 7307 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 35 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 7307 pair heats, loses preload control and smears the raceways.
• The 73xx medium section at 35 mm bore (80×21 mm) is heavier-rated than the 7207 but runs hotter at the same speed; do not substitute a 7307 into a 72-series spindle position without re-checking dn, lubricant film and preload.
• Preload is a design value, not an assembly feel: excessive preload in the 7307 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.
• When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7307 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.
• The 7307 shares its ISO 15 envelope with deep-groove 6307 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.
• The 39/24.5 kN ratings are SKF catalogue 17000 values for the 7307 BEP 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 7307 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7307 BEP designation when purchasing and match the execution to the mounting arrangement.
• A plain 7307 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting.