51422-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 51422-M model number is decoded

The 51400 series order number 51422 M is a SKF single-direction thrust ball bearing for a 110 mm seat, built to ISO 104, with a flat housing seating surface, 110×230×95 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 22 decodes to 110 mm (code 22 × 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 110×230×95 mm (4.331×9.055×3.74 in), 60.0 mm radial section, C 410 kN, C0 1220 kN, Pu 34.5 kN. reference speed 900 r/min (thermal) and limiting speed 1,300 r/min (mechanical), catalogue mass 20000 g. Preload at the mechanical ceiling: repeating Fam ≈ A·(n·dm/1000)² with factor A 7.7 at the 1,300 r/min limiting speed raises the required axial preload to about 376.1 kN; the reference-speed value 180.2 kN is the thermal design point. Rating split for documentation: dynamic 410 kN (L10 life), static 1220 kN (safety factor s0), fatigue limit 34.5 kN (adjusted life) — three different uses of three different numbers for 51422 M, none interchangeable with another. Selection figures for 51422 M: the C0/C ratio is 2.98, Pu 34.5 kN is about 8 % of C, and the catalogue mass works out to roughly 182 g per millimetre of bore; the printed minimum-load factor is A 7.7. Light-load floor: Pu = 34.5 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 51422 M; the number is 8 % of the 410 kN dynamic rating. Static-first selection data: 1220 kN C0 spread across the 95 mm stack gives 12.8 kN of static rating per height millimetre, and the 20000 g mass/C0 ratio is about 16 g per static kN — crane-hook and screw positions are normally sized on these two figures. 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. The M cage of 51422 M adds a small amount of mass and cage strength without changing the 110×230×95 mm ISO 104 envelope, so the pressed-cage execution drops into the same recess but should not be assumed equal under the 1,300 r/min ceiling.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the applied thrust above Fam ≈ A·(n·dm/1000)² with the printed factor A 7.7; for 51422 M a spring preload or the rotor weight is part of the selection at light load and high speed, because unloaded balls skid rather than roll.
• A 51-series bearing reacts thrust in one direction only — reversing positions need a mirrored single-direction pair or a 52-series double-direction unit; fitting a single 51422 against two-way load lifts the loose washer off its raceway.
• When the housing seat cannot be machined square to the 110 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.
• 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 51422: the catalogue page quotes 51422 M and its 410/1220 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.