52212 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 52212 model number is decoded

The 52200 series order number 52212 is a SKF double-direction thrust ball bearing for a 50 mm seat, built to ISO 104, with a flat housing seating surface, 50×95×46 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 50 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 50×95×46 mm (1.969×3.74×1.811 in), 22.5 mm radial section, C 59.2 kN, C0 140 kN, Pu 5.1 kN. reference speed 2,000 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 1200 g. Minimum-load arithmetic: with dm ≈ 72.5 mm and factor A 0.12, Fam ≈ A·(n·dm/1000)² at the 2,000 r/min reference speed is about 2.5 kN for 52212; below that preload the balls skid and smear the tracks. Load balance: C0 140 kN against C 59.2 kN gives a 2.36 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 5.1 kN enters the adjusted-life check. Bore-to-OD planning: OD 95 over bore 50 is a 1.90× step for this size, and the 46 mm height gives a bore/height ratio of 1.09; use these ratios when the housing recess around the 50 mm shaft is the first constraint. Light-load floor: Pu = 5.1 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 52212; the number is 9 % of the 59.2 kN dynamic rating. Static-first selection data: 140 kN C0 spread across the 46 mm stack gives 3.0 kN of static rating per height millimetre, and the 1200 g mass/C0 ratio is about 9 g per static kN — crane-hook and screw positions are normally sized on these two figures. 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 50 mm bore and 46 mm overall height the unit drops into one recess where a mirrored single-direction pair would need two seats; both loose 95 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 2,800 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 140 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 52212 with two single-direction 51-series bearings without re-checking the arrangement: envelope heights, seat details and catalogue ratings differ, even at the same 50×95 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 52200 unit has no alignment capacity.
• Ordering discipline for 52212: the catalogue page quotes 52212 and its 59.2/140 kN ratings as one exact article; bare-number substitutions from another series or brand need a fresh dimension and rating check, not a like-for-like assumption.