51112-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 51112-SKF model number is decoded

Listed in SKF 17000 chapter 5, 51112 is an ISO 104 single-direction thrust ball bearing, 60 mm bore and 85 mm OD on a flat housing seat, standing 17 mm high before installation. The bearing is delivered as separate, interchangeable parts: a ground-bore shaft washer, a loose-bore housing washer and the ball-cage assembly between them, designed for one axial load direction only. 51xxx breaks down as 5 for thrust ball, 1 for one load direction on a flat seat, a section digit 1–4 light-to-heavy, then the two-digit bore code. reading the ending 12: bore 60 mm (code 12 × 5) for this single-direction size, via the standard exceptions 00/01/02/03 and ×5 above them. no cage suffix means the standard stamped steel retainer — a pressed sheet-metal ball-cage assembly that covers the bulk of the thrust-ball assortment. Envelope 60×85×17 mm (2.362×3.346×0.669 in), 12.5 mm radial section, C 41.6 kN, C0 122 kN, Pu 4.55 kN. reference speed 3,600 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 270 g. Preload at the mechanical ceiling: repeating Fam ≈ A·(n·dm/1000)² with factor A 0.077 at the 5,000 r/min limiting speed raises the required axial preload to about 10.1 kN; the reference-speed value 5.2 kN is the thermal design point. Load balance: C0 122 kN against C 41.6 kN gives a 2.93 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 4.55 kN enters the adjusted-life check. Static-first selection data: 122 kN C0 spread across the 17 mm stack gives 7.2 kN of static rating per height millimetre, and the 270 g mass/C0 ratio is about 2 g per static kN — crane-hook and screw positions are normally sized on these two figures. Rating split for documentation: dynamic 41.6 kN (L10 life), static 122 kN (safety factor s0), fatigue limit 4.55 kN (adjusted life) — three different uses of three different numbers for 51112, none interchangeable with another. Light-load floor: Pu = 4.55 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 51112; the number is 11 % of the 41.6 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 60 mm size the pressed cage and separable washers make the bearing interchangeable across brands on the ISO 104 plan, but the SKF ratings 41.6/122 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

• 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.
• Keep the applied thrust above Fam ≈ A·(n·dm/1000)² with the printed factor A 0.077; for 51112 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.
• The 51112 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.
• 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 51100 bearing.
• The 41.6/122 kN figures belong to 51112 specifically (the single flat pressed steel execution of 51112); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.