52412-M 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 52412-M model number is decoded

The 52400 series order number 52412 M is a SKF double-direction thrust ball bearing for a 50 mm seat, built to ISO 104, with a flat housing seating surface, 50×130×93 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 trailing M names a solid machined brass window cage centred on the balls rather than on a washer, the catalogue choice when size, speed or interrupted lubrication rules out sheet steel. Envelope 50×130×93 mm (1.969×5.118×3.661 in), 40.0 mm radial section, C 199 kN, C0 430 kN, Pu 16 kN. reference speed 1,200 r/min (thermal) and limiting speed 1,700 r/min (mechanical), catalogue mass 6350 g. Section proportions: the 40.0 mm radial section compares with 50 mm of bore (section/bore ≈ 0.80) and the 93 mm height is 2.33× that section — the proportions that identify the 52400 envelope at a glance. Envelope economics: the 93 mm axial height over a 40.0 mm radial section yields 2.1 kN of dynamic capacity per height millimetre, and the bearing weighs 6350 g for 199 kN C — about 32 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 1,200 r/min against a 1,700 r/min limiting speed, a reference-to-limit ratio of 0.71. Rating split for documentation: dynamic 199 kN (L10 life), static 430 kN (safety factor s0), fatigue limit 16 kN (adjusted life) — three different uses of three different numbers for 52412 M, none interchangeable with another. Track-circle loading: per millimetre of mean track circumference the 199 kN dynamic rating corresponds to roughly 0.70 kN/mm of π·dm track, a useful comparison against the other dimension series of the 50 mm bore. Heavy double-direction note: the M suffix on a 52/54-series bearing means both ball-cage assemblies are machined brass and ball-centred for the largest bidirectional positions; both cage sets share the same lubrication requirement, so the oil or grease feed must reach the upper as well as the lower track on vertical shafts. The M suffix means BOTH cage sets of the 93 mm stack are machined brass; spare-part orders of one side should still be placed as the complete 52412 M unit, because mixed cage executions in one double-direction stack are not a catalogue configuration.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The central shaft washer takes the interference fit on the 50 mm shaft while both outer housing washers run loose in their registers; both loose washers need positive axial retention on vertical shafts.
• 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 52400 unit has no alignment capacity.
• Observe the stack order at fitting: shaft washer central, the two housing washers facing outwards with a cage set on each side; the 93 mm total height is not twice a single-direction bearing height, so reuse of old cover dimensions is a trap.
• Service both cage sets together: replacing only the noisy side while leaving the worn 430 kN opposite track in place reproduces the failure within weeks — inspect both shaft-washer faces and both loose washers at removal.
• The 199/430 kN figures belong to 52412 M specifically (the double flat brass execution of 52412); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.