51334-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 51334-M model number is decoded

51334 M is SKF's 170 mm-bore single-direction thrust ball bearing in the 51300 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 170×280×87 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 34 encode the bore as 170 mm (code 34 × 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 170×280×87 mm (6.693×11.024×3.425 in), 55.0 mm radial section, C 468 kN, C0 1760 kN, Pu 43 kN. reference speed 800 r/min (thermal) and limiting speed 1,100 r/min (mechanical), catalogue mass 22000 g. Envelope economics: the 87 mm axial height over a 55.0 mm radial section yields 5.4 kN of dynamic capacity per height millimetre, and the bearing weighs 22000 g for 468 kN C — about 47 g per rated kN. Stack/annulus proportions: the 87 mm axial stack over the 38,877 mm² washer annulus gives 2.24 mm of height per annular square millimetre ×10⁻³, and at 22000 g the bearing holds about 80.0 kN of C0 per kilogram. Minimum-load arithmetic: with dm ≈ 225.0 mm and factor A 16, Fam ≈ A·(n·dm/1000)² at the 800 r/min reference speed is about 518.4 kN for 51334 M; below that preload the balls skid and smear the tracks. Mass and section check: 22000 g inside the 170×280×87 mm outline leaves a 55.0 mm radial section, and the 1760 kN static rating is 3.76× the dynamic rating — plan static safety and minimum preload against those figures. Light-load floor: Pu = 43 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 51334 M; the number is 9 % of the 468 kN dynamic rating. 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. At 22000 g the machined brass cage represents a meaningful fraction of total mass; balancing checks on high-speed 170 mm vertical shafts should use the actual M-execution weight, not the lighter pressed-cage catalogue value.

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.
• The third digit grades the section: 511 light, then 512, 513 and 514 progressively taller and heavier at the same bore — select from 468/1760 kN and the available 280 mm OD, never substitute a lighter series for a heavier one without rechecking C and C0.
• Identify the washers before fitting: the shaft washer has the ground, smaller bore and takes an interference fit on the 170 mm shaft, while the housing washer bore is larger and runs loose; swapping them locks the ball set and burns the tracks.
• When the housing seat cannot be machined square to the 170 mm shaft, the sphered 53-series execution of this size with its U seat washer is the self-aligning counterpart of this flat 51300 bearing.
• The 468/1760 kN figures belong to 51334 M specifically (the single flat brass execution of 51334); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.