51264-F 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 51264-F model number is decoded

51264 F is SKF's 320 mm-bore single-direction thrust ball bearing in the 51200 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 320×440×95 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 64 encode the bore as 320 mm (code 64 × 5), the standard SKF bore-code rule shared with radial bearings. suffix F identifies a machined steel cage, ball-centred: fitted to the largest sizes of the assortment where the ball complement and centrifugal forces exceed what the stamped sheet-steel execution can guide. Envelope 320×440×95 mm (12.598×17.323×3.74 in), 60.0 mm radial section, C 572 kN, C0 3000 kN, Pu 56 kN. reference speed 600 r/min (thermal) and limiting speed 800 r/min (mechanical), catalogue mass 45500 g. Load balance: C0 3000 kN against C 572 kN gives a 5.24 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 56 kN enters the adjusted-life check. At the printed limiting speed of 800 r/min the mean pitch diameter dm ≈ 380.0 mm implies a dn value around 304k mm·r/min; the 600 r/min reference speed is the thermal-planning value under catalogue load. Light-load floor: Pu = 56 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 51264 F; the number is 10 % of the 572 kN dynamic rating. Pitch-diameter arithmetic: dm = (320+440)/2 = 380.0 mm; at the 800 r/min limiting speed that corresponds to roughly 304k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Speed planning separates the two ceilings mechanically: the pressed steel cage and balls tolerate 800 r/min while thermal balance under catalogue load sets the 600 r/min reference; at dm ≈ 380.0 mm the corresponding dn is approximately 304k mm·r/min. Large-size execution note: the F machined steel cage exists because the ball complement and pitch diameter of the biggest 512-series sizes are beyond pressed-cage guidance; the steel cage is machined from solid, ball-centred, and its heavier mass must be supported by genuine oil or grease flow at start-up — never mount an F bearing dry for a trial rotation. Mounting note for the 95 mm F stack: induction-heat the shaft washer only — the machined steel cage rides the balls and must never be tapped, and first rotation should be a slow unloaded bedding run before the working thrust goes on.

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 572 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 320 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 47; for 51264 F 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 572/3000 kN figures belong to 51264 F specifically (the single flat machined steel execution of 51264); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.