51426-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 51426-M model number is decoded

51426 M is SKF's 130 mm-bore single-direction thrust ball bearing in the 51400 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 130×270×110 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 26 encode the bore as 130 mm (code 26 × 5), the standard SKF bore-code rule shared with radial bearings. suffix M identifies a one-piece machined brass cage, ball-centred: the large-size and heavy-section option for higher speeds, shock loads and thin-film lubrication where a pressed cage would distort. Envelope 130×270×110 mm (5.118×10.63×4.331 in), 70.0 mm radial section, C 520 kN, C0 1730 kN, Pu 45 kN. reference speed 750 r/min (thermal) and limiting speed 1,000 r/min (mechanical), catalogue mass 32000 g. Load balance: C0 1730 kN against C 520 kN gives a 3.33 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 45 kN enters the adjusted-life check. Capacity density: 520 kN C from 32.000 kg of bearing steel gives about 16.3 kN per kilogram; static density is correspondingly 54.1 kN/kg at C0 1730 kN. Imperial cross-check for procurement drawings: 5.118 in bore, 10.63 in OD, 4.331 in height, and the 32000 g catalogue mass converts to 32.000 kg (1128.7 oz). Mass and section check: 32000 g inside the 130×270×110 mm outline leaves a 70.0 mm radial section, and the 1730 kN static rating is 3.33× the dynamic rating — plan static safety and minimum preload against those figures. Rating split for documentation: dynamic 520 kN (L10 life), static 1730 kN (safety factor s0), fatigue limit 45 kN (adjusted life) — three different uses of three different numbers for 51426 M, none interchangeable with another. 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 51426 M adds a small amount of mass and cage strength without changing the 130×270×110 mm ISO 104 envelope, so the pressed-cage execution drops into the same recess but should not be assumed equal under the 1,000 r/min ceiling.

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 110 mm stack; thrust-ball bearings on horizontal shafts should have the shaft washer (the tight one) against the rotating element.
• Identify the washers before fitting: the shaft washer has the ground, smaller bore and takes an interference fit on the 130 mm shaft, while the housing washer bore is larger and runs loose; swapping them locks the ball set and burns the tracks.
• 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 520 kN track before first rotation.
• 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.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 51426 M as the single flat brass execution; other order numbers of the 51426 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.