51312-SKF 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 51312-SKF model number is decoded

The 51300 series order number 51312 is a SKF single-direction thrust ball bearing for a 60 mm seat, built to ISO 104, with a flat housing seating surface, 60×110×35 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 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 60×110×35 mm (2.362×4.331×1.378 in), 25.0 mm radial section, C 101 kN, C0 224 kN, Pu 8.3 kN. reference speed 2,200 r/min (thermal) and limiting speed 3,000 r/min (mechanical), catalogue mass 1350 g. Track-circle loading: per millimetre of mean track circumference the 101 kN dynamic rating corresponds to roughly 0.38 kN/mm of π·dm track, a useful comparison against the other dimension series of the 60 mm bore. Pitch-diameter arithmetic: dm = (60+110)/2 = 85.0 mm; at the 3,000 r/min limiting speed that corresponds to roughly 255k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Mass and section check: 1350 g inside the 60×110×35 mm outline leaves a 25.0 mm radial section, and the 224 kN static rating is 2.22× the dynamic rating — plan static safety and minimum preload against those figures. 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. Washer-annulus check: the π/4·(D²−d²) contact annulus of 51312 covers about 6,676 mm², distributing C0 224 kN over a mean track circle of π·dm ≈ 267 mm. Execution note for this order number: the flat housing seating surface must be machined square to the shaft axis and supported across the full washer face — unlike the sphered 53-series execution this pressed-cage 51-series bearing has no self-aligning capability at all, so seat squareness is checked at mounting, not compensated in service. Inspection after removal of a 35 mm-high stack means checking both washer faces: the loose housing washer often shows the first false-brinell marks under machine vibration even though the tight shaft washer carries the rotating load of 101 kN C.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The 51312 is a pure axial bearing: it must never be subjected to radial load — any radial force on the 60 mm shaft has to be carried by a radial bearing mounted alongside it.
• Heat the shaft washer to at most 120 °C for mounting, or press it via a sleeve on its ground bore — force applied through the housing washer or the ball set brinells the 101 kN track before first rotation.
• 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 51300 bearing.
• 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 35 mm stack; thrust-ball bearings on horizontal shafts should have the shaft washer (the tight one) against the rotating element.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 51312 as the single flat pressed steel execution; other order numbers of the 51312 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.