52311 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 52311 model number is decoded

The 52300 series order number 52311 is a SKF double-direction thrust ball bearing for a 45 mm seat, built to ISO 104, with a flat housing seating surface, 45×105×64 mm boundary dimensions. Inside the unit sit a single central shaft washer with a ground interference bore, two outward-facing loose housing washers and two independent ball-cage assemblies, so axial force is reacted in both directions from one housing recess. bore-coding caveat: on 52/54 double-direction bearings the last two digits are an order-number code, not ×5 millimetres — this size carries a 45 mm bore per the ISO 104 table, and guessing from the code gives the wrong shaft. the suffix-free listing carries the catalogue default: a pressed (stamped sheet-steel) ball-cage assembly, light and quiet, used across the small and medium sizes. Envelope 45×105×64 mm (1.772×4.134×2.52 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 2400 g. Mass and section check: 2400 g inside the 45×105×64 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. Light-load floor: Pu = 8.3 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 52311; the number is 8 % of the 101 kN dynamic rating. Track-circle loading: per millimetre of mean track circumference the 101 kN dynamic rating corresponds to roughly 0.43 kN/mm of π·dm track, a useful comparison against the other dimension series of the 45 mm bore. 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. Speed-ratio note for this exact unit: the reference speed is 1,600 r/min against a 2,200 r/min limiting speed, a reference-to-limit ratio of 0.73. 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 45 mm bore and 64 mm overall height the unit drops into one recess where a mirrored single-direction pair would need two seats; both loose 105 mm housing washers must remain free to slide during thermal movement.

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 52311 with two single-direction 51-series bearings without re-checking the arrangement: envelope heights, seat details and catalogue ratings differ, even at the same 45×105 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 52311 as the double flat pressed steel execution; other order numbers of the 52311 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.