53418-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 53418-M model number is decoded

53418 M is SKF's 90 mm-bore single-direction thrust ball bearing in the 53400 series to the ISO 104 dimension plan, with a sphered housing washer paired to a U seat washer, measuring 90×190×81.2 mm U 418 seat washer companion included in the mounted H1 dimension. 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 53xxx designation the 3 marks a single-direction bearing whose housing washer has a sphered (convex) seating surface, intended to run against the matching U seat washer; the third digit 2–4 grades the section. the final two digits 18 encode the bore as 90 mm (code 18 × 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 90×190×81.2 mm (3.543×7.48×3.197 in), 50.0 mm radial section, C 307 kN, C0 815 kN, Pu 25.5 kN. Mounted height H1 88 mm includes the U 418 seat washer; the bearing alone is 81.2 mm high. reference speed 1,100 r/min (thermal) and limiting speed 1,500 r/min (mechanical), catalogue mass 13000 g. Washer-stack proportions: the U 418 seat washer adds 6.8 mm to the 81.2 mm bearing height for a mounted H1 of 88 mm, while the 50.0 mm radial section against 90 mm bore (section/bore ≈ 0.56) identifies the envelope. Selection figures for 53418 M: the C0/C ratio is 2.65, Pu 25.5 kN is about 8 % of C, and the catalogue mass works out to roughly 144 g per millimetre of bore; the printed minimum-load factor is A 3.5. Speed band width for this size is 400 r/min between reference and limiting (1.36× ratio); lubrication, preload and heat removal decide where inside that band 53418 M can actually run. At the printed limiting speed of 1,500 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 210k mm·r/min; the 1,100 r/min reference speed is the thermal-planning value under catalogue load. Pitch-diameter arithmetic: dm = (90+190)/2 = 140.0 mm; at the 1,500 r/min limiting speed that corresponds to roughly 210k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Heavy sphered-execution note: this M order number combines the machined brass ball-centred cage with the sphered housing washer and its U seat washer; it is the large-bore answer for hook blocks and pivots whose fabricated structure deflects — verify the spherical pair swivels freely under a light preload before the working load goes on. The M brass-cage option at 90 mm bore pairs the heavy-section cage with the U 418 seat requirement — order all three articles (bearing + U washer + appropriate lubricant) together, and log the H1 88 mm installed dimension on the maintenance card.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The sphered housing washer of 53418 M MUST run against the U 418 seat washer, a separate order number; mounted bare on a flat register, the convex back makes point contact that gouges the housing under load.
• Keep the sphered interface clean and lightly greased: scale, paint or grit between the washer back and U 418 locks the aligning function and frets under load; re-grease the contact at every overhaul.
• Dimension the housing to the 88 mm mounted height H1 (bearing plus U 418), not the 81.2 mm bearing height H — confusing the two is a recurring drawing error for the 53-series.
• The spherical seat accommodates INITIAL static misalignment between shaft and housing; it is not a swivel for continuous oscillation, and the bearing still carries pure axial load with no radial capacity.
• The 307/815 kN figures belong to 53418 M specifically (the single sphered brass execution of 53418); suffixed, sphered and counterpart-series order numbers are separate articles, and U 418 is ordered separately, so write the complete designation on the order and the maintenance record.