52312 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 52312 model number is decoded

52312 is SKF's 50 mm-bore double-direction thrust ball bearing in the 52300 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 50×110×64 mm. The unit stacks one central shaft washer (ground bore, tight on the shaft), two outward-facing housing washers and two ball-cage assemblies, reacting axial force in both directions. double-direction 52/54 numbering does NOT decode the bore by the usual single-direction ×5 code — read the 50 mm bore from the dimension table; codes recur across the 522/523/524 sections and systematically trail the 51/53 code values. with no cage suffix this is the standard execution with a stamped sheet-steel ball-cage assembly (pressed cage) — the light, quiet and economical cage for small and medium thrust-ball sizes. Envelope 50×110×64 mm (1.969×4.331×2.52 in), 30.0 mm radial section, C 101 kN, C0 224 kN, Pu 8.3 kN. reference speed 1,600 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 2550 g. Mass and section check: 2550 g inside the 50×110×64 mm outline leaves a 30.0 mm radial section, and the 224 kN static rating is 2.22× the dynamic rating — plan static safety and minimum preload against those figures. Envelope economics: the 64 mm axial height over a 30.0 mm radial section yields 1.6 kN of dynamic capacity per height millimetre, and the bearing weighs 2550 g for 101 kN C — about 25 g per rated kN. Load balance: C0 224 kN against C 101 kN gives a 2.22 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 8.3 kN enters the adjusted-life check. Light-load floor: Pu = 8.3 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 52312; the number is 8 % of the 101 kN dynamic rating. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 64 mm height gives a bore/height ratio of 0.78; use these ratios when the housing recess around the 50 mm shaft is the first constraint. 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. Life accounting for 52312 is done separately per direction: if duty applies 101 kN C predominantly one way, the idle side's skid risk — not the loaded side's L10 — usually sets the relubrication and preload interval.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Torque the cover to leave the catalogue axial freedom, never solid: a clamped double-direction stack cannot float to its thermal position, and at 2,200 r/min even a small thermal thrust preload smears the hottest track.
• Service both cage sets together: replacing only the noisy side while leaving the worn 224 kN opposite track in place reproduces the failure within weeks — inspect both shaft-washer faces and both loose washers at removal.
• Do not replace a 52312 with two single-direction 51-series bearings without re-checking the arrangement: envelope heights, seat details and catalogue ratings differ, even at the same 50×110 mm bore and OD.
• 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.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 52312 as the double flat pressed steel execution; other order numbers of the 52312 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.