51412-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 51412-M model number is decoded

The 51400 series order number 51412 M is a SKF single-direction thrust ball bearing for a 60 mm seat, built to ISO 104, with a flat housing seating surface, 60×130×51 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 12 decodes to 60 mm (code 12 × 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 60×130×51 mm (2.362×5.118×2.008 in), 35.0 mm radial section, C 199 kN, C0 430 kN, Pu 16 kN. reference speed 1,600 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 3100 g. Load balance: C0 430 kN against C 199 kN gives a 2.16 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 16 kN enters the adjusted-life check. Envelope economics: the 51 mm axial height over a 35.0 mm radial section yields 3.9 kN of dynamic capacity per height millimetre, and the bearing weighs 3100 g for 199 kN C — about 16 g per rated kN. Sizing arithmetic on the 60 mm bore: 199 kN C over the 35.0 mm radial section gives 5.7 kN per section millimetre, and the 51 mm stack height is 1.46× that section — proportions typical of a 51400 thrust section. Speed band width for this size is 600 r/min between reference and limiting (1.38× ratio); lubrication, preload and heat removal decide where inside that band 51412 M can actually run. Washer-annulus check: the π/4·(D²−d²) contact annulus of 51412 M covers about 10,446 mm², distributing C0 430 kN over a mean track circle of π·dm ≈ 298 mm. 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 3100 g the machined brass cage represents a meaningful fraction of total mass; balancing checks on high-speed 60 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

• When the housing seat cannot be machined square to the 60 mm shaft, the sphered 53-series execution of this size with its U seat washer is the self-aligning counterpart of this flat 51400 bearing.
• Identify the washers before fitting: the shaft washer has the ground, smaller bore and takes an interference fit on the 60 mm shaft, while the housing washer bore is larger and runs loose; swapping them locks the ball set and burns the tracks.
• 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 51 mm stack; thrust-ball bearings on horizontal shafts should have the shaft washer (the tight one) against the rotating element.
• The three components are separable and interchangeable within the ISO 104 size, but keep this bearing's parts together in service and never combine washers from different manufacturers or a worn washer with a new ball set.
• Ordering discipline for 51412: the catalogue page quotes 51412 M and its 199/430 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.