51134-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 51134-M model number is decoded

The 51100 series order number 51134 M is a SKF single-direction thrust ball bearing for a 170 mm seat, built to ISO 104, with a flat housing seating surface, 170×215×34 mm boundary dimensions. Three separable parts make the set: the tight-bore shaft washer that locates on the shaft, the loose-bore housing washer in its register, and the ball-cage assembly; load is purely axial and acts in one direction. reading 51xxx as a code: the 1 after 5 identifies one load direction and a flat seat, and the next digit ranks the section 1 (light) to 4 (heavy) before the two-digit bore code. bore code 34 decodes to 170 mm (code 34 × 5) under the same 00/01/02/03-exception, ×5 rule SKF uses across its coded bearing ranges. the trailing M names a solid machined brass window cage centred on the balls rather than on a washer, the catalogue choice when size, speed or interrupted lubrication rules out sheet steel. Envelope 170×215×34 mm (6.693×8.465×1.339 in), 22.5 mm radial section, C 133 kN, C0 540 kN, Pu 14.3 kN. reference speed 1,600 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 3300 g. Envelope economics: the 34 mm axial height over a 22.5 mm radial section yields 3.9 kN of dynamic capacity per height millimetre, and the bearing weighs 3300 g for 133 kN C — about 25 g per rated kN. Capacity density: 133 kN C from 3.300 kg of bearing steel gives about 40.3 kN per kilogram; static density is correspondingly 163.6 kN/kg at C0 540 kN. Pitch-diameter arithmetic: dm = (170+215)/2 = 192.5 mm; at the 2,200 r/min limiting speed that corresponds to roughly 424k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Track-circle loading: per millimetre of mean track circumference the 133 kN dynamic rating corresponds to roughly 0.22 kN/mm of π·dm track, a useful comparison against the other dimension series of the 170 mm bore. Minimum-load arithmetic: with dm ≈ 192.5 mm and factor A 1.5, Fam ≈ A·(n·dm/1000)² at the 1,600 r/min reference speed is about 142.3 kN for 51134 M; below that preload the balls skid and smear the tracks. 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 3300 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.
• 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.
• The third digit grades the section: 511 light, then 512, 513 and 514 progressively taller and heavier at the same bore — select from 133/540 kN and the available 215 mm OD, never substitute a lighter series for a heavier one without rechecking C and C0.
• Keep the applied thrust above Fam ≈ A·(n·dm/1000)² with the printed factor A 1.5; for 51134 M 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 133/540 kN figures belong to 51134 M specifically (the single flat brass execution of 51134); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.