52307 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-28

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 52307 model number is decoded

Listed in SKF 17000 chapter 5, 52307 is an ISO 104 double-direction thrust ball bearing, 30 mm bore and 68 mm OD on a flat housing seat, standing 44 mm high before installation. Construction is a five-component stack: one central shaft washer with tracks on both faces, two outward-facing housing washers and two cage sets, which lets one housing recess accept thrust from either direction. note the bore of 52307 is 30 mm by the dimension table: the double-direction series was deliberately aligned to the 51/53 washer sets with shifted codes, so the familiar 04=20 arithmetic does not apply here. no cage suffix means the standard stamped steel retainer — a pressed sheet-metal ball-cage assembly that covers the bulk of the thrust-ball assortment. Envelope 30×68×44 mm (1.181×2.677×1.732 in), 19.0 mm radial section, C 49.4 kN, C0 96.5 kN, Pu 3.55 kN. reference speed 2,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 680 g. Selection figures for 52307: the C0/C ratio is 1.95, Pu 3.55 kN is about 7 % of C, and the catalogue mass works out to roughly 23 g per millimetre of bore; the printed minimum-load factor is A 0.048. Bore-to-OD planning: OD 68 over bore 30 is a 2.27× step for this size, and the 44 mm height gives a bore/height ratio of 0.68; use these ratios when the housing recess around the 30 mm shaft is the first constraint. At the printed limiting speed of 3,400 r/min the mean pitch diameter dm ≈ 49.0 mm implies a dn value around 167k mm·r/min; the 2,400 r/min reference speed is the thermal-planning value under catalogue load. Light-load floor: Pu = 3.55 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 52307; the number is 7 % of the 49.4 kN dynamic rating. Track-circle loading: per millimetre of mean track circumference the 49.4 kN dynamic rating corresponds to roughly 0.32 kN/mm of π·dm track, a useful comparison against the other dimension series of the 30 mm bore. Double-direction order-number note: the unit is built around one central shaft washer with a ground bore and tracks on both faces, flanked by two housing washers and two independent ball-cage assemblies; observe the assembly orientation (the two housing washers face outwards) and note that a 52-series unit replaces a mirrored pair of 51-series bearings only after the stack height and seat drawings are re-checked. At 30 mm bore and 44 mm overall height the unit drops into one recess where a mirrored single-direction pair would need two seats; both loose 68 mm housing washers must remain free to slide during thermal movement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not replace a 52307 with two single-direction 51-series bearings without re-checking the arrangement: envelope heights, seat details and catalogue ratings differ, even at the same 30×68 mm bore and OD.
• Torque the cover to leave the catalogue axial freedom, never solid: a clamped double-direction stack cannot float to its thermal position, and at 3,400 r/min even a small thermal thrust preload smears the hottest track.
• Where shaft and housing cannot be kept square, the sphered 54-series execution of the same bore with two U seat washers is the self-aligning counterpart; the flat 52300 unit has no alignment capacity.
• The central shaft washer takes the interference fit on the 30 mm shaft while both outer housing washers run loose in their registers; both loose washers need positive axial retention on vertical shafts.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 52307 as the double flat pressed steel execution; other order numbers of the 52307 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.