51411-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 51411-SKF model number is decoded

51411 is SKF's 55 mm-bore single-direction thrust ball bearing in the 51400 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 55×120×48 mm. The separable set comprises a shaft washer (ground bore, tight fit on the shaft), a loose-bore housing washer and one ball-cage assembly, reacting axial force in one direction and carrying no radial load. in the 51xxx designation the first 1 marks a single-direction bearing with a flat housing seating surface; the third digit 1–4 grades the dimension series from the light 511 section through the heavy 514 section. the final two digits 11 encode the bore as 55 mm (code 11 × 5), the standard SKF bore-code rule shared with radial bearings. with no cage suffix this is the standard execution with a stamped sheet-steel ball-cage assembly (pressed cage) — the light, quiet and economical cage for small and medium thrust-ball sizes. Envelope 55×120×48 mm (2.165×4.724×1.89 in), 32.5 mm radial section, C 195 kN, C0 400 kN, Pu 14.6 kN. reference speed 1,800 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 2550 g. Envelope economics: the 48 mm axial height over a 32.5 mm radial section yields 4.1 kN of dynamic capacity per height millimetre, and the bearing weighs 2550 g for 195 kN C — about 13 g per rated kN. Minimum-load arithmetic: with dm ≈ 87.5 mm and factor A 0.79, Fam ≈ A·(n·dm/1000)² at the 1,800 r/min reference speed is about 19.6 kN for 51411; below that preload the balls skid and smear the tracks. Speed band width for this size is 600 r/min between reference and limiting (1.33× ratio); lubrication, preload and heat removal decide where inside that band 51411 can actually run. Rating split for documentation: dynamic 195 kN (L10 life), static 400 kN (safety factor s0), fatigue limit 14.6 kN (adjusted life) — three different uses of three different numbers for 51411, none interchangeable with another. Light-load floor: Pu = 14.6 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 51411; the number is 7 % of the 195 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. Inspection after removal of a 48 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 195 kN C.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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.
• 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 195 kN track before first rotation.
• Identify the washers before fitting: the shaft washer has the ground, smaller bore and takes an interference fit on the 55 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 0.79; for 51411 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 195/400 kN figures belong to 51411 specifically (the single flat pressed steel execution of 51411); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.