51213-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 51213-SKF model number is decoded

The 51200 series order number 51213 is a SKF single-direction thrust ball bearing for a 65 mm seat, built to ISO 104, with a flat housing seating surface, 65×100×27 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 13 decodes to 65 mm (code 13 × 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 65×100×27 mm (2.559×3.937×1.063 in), 17.5 mm radial section, C 60.5 kN, C0 150 kN, Pu 5.5 kN. reference speed 2,600 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 720 g. Speed band width for this size is 1,000 r/min between reference and limiting (1.38× ratio); lubrication, preload and heat removal decide where inside that band 51213 can actually run. Capacity density: 60.5 kN C from 0.720 kg of bearing steel gives about 84.0 kN per kilogram; static density is correspondingly 208.3 kN/kg at C0 150 kN. Selection figures for 51213: the C0/C ratio is 2.48, Pu 5.5 kN is about 9 % of C, and the catalogue mass works out to roughly 11 g per millimetre of bore; the printed minimum-load factor is A 0.14. Sizing arithmetic on the 65 mm bore: 60.5 kN C over the 17.5 mm radial section gives 3.5 kN per section millimetre, and the 27 mm stack height is 1.54× that section — proportions typical of a 51200 thrust section. Light-load floor: Pu = 5.5 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 51213; the number is 9 % of the 60.5 kN dynamic rating. 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. On this 65 mm size the pressed cage and separable washers make the bearing interchangeable across brands on the ISO 104 plan, but the SKF ratings 60.5/150 kN are this catalogue's figures — confirm the replacement order's ratings rather than swapping on envelope alone.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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 27 mm stack; thrust-ball bearings on horizontal shafts should have the shaft washer (the tight one) against the rotating element.
• The 51213 is a pure axial bearing: it must never be subjected to radial load — any radial force on the 65 mm shaft has to be carried by a radial bearing mounted alongside it.
• When the housing seat cannot be machined square to the 65 mm shaft, the sphered 53-series execution of this size with its U seat washer is the self-aligning counterpart of this flat 51200 bearing.
• The third digit grades the section: 511 light, then 512, 513 and 514 progressively taller and heavier at the same bore — select from 60.5/150 kN and the available 100 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 51213 as the single flat pressed steel execution; other order numbers of the 51213 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.