51130-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 51130-M model number is decoded

51130 M is SKF's 150 mm-bore single-direction thrust ball bearing in the 51100 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 150×190×31 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 30 encode the bore as 150 mm (code 30 × 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 150×190×31 mm (5.906×7.48×1.22 in), 20.0 mm radial section, C 111 kN, C0 440 kN, Pu 12.5 kN. reference speed 1,700 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 2200 g. Washer-annulus check: the π/4·(D²−d²) contact annulus of 51130 M covers about 10,681 mm², distributing C0 440 kN over a mean track circle of π·dm ≈ 534 mm. Rating split for documentation: dynamic 111 kN (L10 life), static 440 kN (safety factor s0), fatigue limit 12.5 kN (adjusted life) — three different uses of three different numbers for 51130 M, none interchangeable with another. Preload at the mechanical ceiling: repeating Fam ≈ A·(n·dm/1000)² with factor A 1 at the 2,400 r/min limiting speed raises the required axial preload to about 166.5 kN; the reference-speed value 83.5 kN is the thermal design point. Load balance: C0 440 kN against C 111 kN gives a 3.96 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 12.5 kN enters the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 1,700 r/min against a 2,400 r/min limiting speed, a reference-to-limit ratio of 0.71. 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 2200 g the machined brass cage represents a meaningful fraction of total mass; balancing checks on high-speed 150 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

• When the housing seat cannot be machined square to the 150 mm shaft, the sphered 53-series execution of this size with its U seat washer is the self-aligning counterpart of this flat 51100 bearing.
• Keep the applied thrust above Fam ≈ A·(n·dm/1000)² with the printed factor A 1; for 51130 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.
• Identify the washers before fitting: the shaft washer has the ground, smaller bore and takes an interference fit on the 150 mm shaft, while the housing washer bore is larger and runs loose; swapping them locks the ball set and burns the tracks.
• The 51130 M is a pure axial bearing: it must never be subjected to radial load — any radial force on the 150 mm shaft has to be carried by a radial bearing mounted alongside it.
• Ordering discipline for 51130: the catalogue page quotes 51130 M and its 111/440 kN ratings as one exact article; bare-number substitutions from another series or brand need a fresh dimension and rating check, not a like-for-like assumption.