51132-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 51132-M model number is decoded

The 51100 series order number 51132 M is a SKF single-direction thrust ball bearing for a 160 mm seat, built to ISO 104, with a flat housing seating surface, 160×200×31 mm boundary dimensions. Three separable parts make the set: the tight-bore shaft washer that locates on the shaft, the loose-bore housing washer in its register, and the ball-cage assembly; load is purely axial and acts in one direction. reading 51xxx as a code: the 1 after 5 identifies one load direction and a flat seat, and the next digit ranks the section 1 (light) to 4 (heavy) before the two-digit bore code. bore code 32 decodes to 160 mm (code 32 × 5) under the same 00/01/02/03-exception, ×5 rule SKF uses across its coded bearing ranges. 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 160×200×31 mm (6.299×7.874×1.22 in), 20.0 mm radial section, C 112 kN, C0 465 kN, Pu 12.9 kN. reference speed 1,700 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 2350 g. Envelope economics: the 31 mm axial height over a 20.0 mm radial section yields 3.6 kN of dynamic capacity per height millimetre, and the bearing weighs 2350 g for 112 kN C — about 21 g per rated kN. Rating split for documentation: dynamic 112 kN (L10 life), static 465 kN (safety factor s0), fatigue limit 12.9 kN (adjusted life) — three different uses of three different numbers for 51132 M, none interchangeable with another. Stack/annulus proportions: the 31 mm axial stack over the 11,310 mm² washer annulus gives 2.74 mm of height per annular square millimetre ×10⁻³, and at 2350 g the bearing holds about 197.9 kN of C0 per kilogram. Speed band width for this size is 700 r/min between reference and limiting (1.41× ratio); lubrication, preload and heat removal decide where inside that band 51132 M can actually run. Sizing arithmetic on the 160 mm bore: 112 kN C over the 20.0 mm radial section gives 5.6 kN per section millimetre, and the 31 mm stack height is 1.55× that section — proportions typical of a 51100 thrust section. Machined-cage order-number note: the M brass cage is a one-piece ball-centred window cage, chosen at the heavy end of the section for speed and shock duty; it is heavier and stiffer than the pressed-steel execution of the smaller sizes and tolerates interrupted lubrication far better, which is why the catalogue restricts the M suffix to the large bores. At 2350 g the machined brass cage represents a meaningful fraction of total mass; balancing checks on high-speed 160 mm vertical shafts should use the actual M-execution weight, not the lighter pressed-cage catalogue value.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The 51132 M is a pure axial bearing: it must never be subjected to radial load — any radial force on the 160 mm shaft has to be carried by a radial bearing mounted alongside it.
• On vertical shafts retain the loose housing washer positively with a cover or ring and verify the grease fill does not drain out of the 31 mm stack; thrust-ball bearings on horizontal shafts should have the shaft washer (the tight one) against the rotating element.
• When the housing seat cannot be machined square to the 160 mm shaft, the sphered 53-series execution of this size with its U seat washer is the self-aligning counterpart of this flat 51100 bearing.
• The third digit grades the section: 511 light, then 512, 513 and 514 progressively taller and heavier at the same bore — select from 112/465 kN and the available 200 mm OD, never substitute a lighter series for a heavier one without rechecking C and C0.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 51132 M as the single flat brass execution; other order numbers of the 51132 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.