53420-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 53420-M model number is decoded

53420 M is SKF's 100 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 100×210×90 mm U 420 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 20 encode the bore as 100 mm (code 20 × 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 100×210×90 mm (3.937×8.268×3.543 in), 55.0 mm radial section, C 371 kN, C0 1060 kN, Pu 31.5 kN. Mounted height H1 98 mm includes the U 420 seat washer; the bearing alone is 90 mm high. reference speed 950 r/min (thermal) and limiting speed 1,300 r/min (mechanical), catalogue mass 18000 g. Stack/annulus proportions: the 90 mm axial stack over the 26,782 mm² washer annulus gives 3.36 mm of height per annular square millimetre ×10⁻³, and at 18000 g the bearing holds about 58.9 kN of C0 per kilogram. Load balance: C0 1060 kN against C 371 kN gives a 2.86 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 31.5 kN enters the adjusted-life check. Selection figures for 53420 M: the C0/C ratio is 2.86, Pu 31.5 kN is about 8 % of C, and the catalogue mass works out to roughly 180 g per millimetre of bore; the printed minimum-load factor is A 5.8. Sizing arithmetic on the 100 mm bore: 371 kN C over the 55.0 mm radial section gives 6.7 kN per section millimetre, and the 90 mm stack height is 1.64× that section — proportions typical of a 53400 thrust section. Speed-ratio note for this exact unit: the reference speed is 950 r/min against a 1,300 r/min limiting speed, a reference-to-limit ratio of 0.73. 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 100 mm bore pairs the heavy-section cage with the U 420 seat requirement — order all three articles (bearing + U washer + appropriate lubricant) together, and log the H1 98 mm installed dimension on the maintenance card.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Dimension the housing to the 98 mm mounted height H1 (bearing plus U 420), not the 90 mm bearing height H — confusing the two is a recurring drawing error for the 53-series.
• The sphered housing washer of 53420 M MUST run against the U 420 seat washer, a separate order number; mounted bare on a flat register, the convex back makes point contact that gouges the housing under load.
• The self-aligning feature is checked at commissioning by hand: with the shaft under no load the assembly must swivel and settle; a stiff spherical seat means dirt, a mismatched U washer, or a register bored off-axis.
• Replacement orders must list both 53420 M and U 420: the seat washer is a separate article, and a U washer of the wrong size narrows the contact band of the 1060 kN static-rated set.
• The 371/1060 kN figures belong to 53420 M specifically (the single sphered brass execution of 53420); suffixed, sphered and counterpart-series order numbers are separate articles, and U 420 is ordered separately, so write the complete designation on the order and the maintenance record.