53310 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 53310 model number is decoded

Listed in SKF 17000 chapter 5, 53310 is an ISO 104 single-direction thrust ball bearing, 50 mm bore and 95 mm OD, with a sphered housing washer and U seat washer, standing 34.3 mm high before installation. The bearing is delivered as separate, interchangeable parts: a ground-bore shaft washer, a loose-bore housing washer and the ball-cage assembly between them, designed for one axial load direction only. 53xxx reads as 5 (thrust ball), 3 (single direction with a sphered housing washer), a 2–4 section digit and the bore code; the U seat washer companion carries the matching three-digit number. reading the ending 10: bore 50 mm (code 10 × 5) for this single-direction size, via the standard exceptions 00/01/02/03 and ×5 above them. no cage suffix means the standard stamped steel retainer — a pressed sheet-metal ball-cage assembly that covers the bulk of the thrust-ball assortment. Envelope 50×95×34.3 mm (1.969×3.74×1.35 in), 22.5 mm radial section, C 81.9 kN, C0 170 kN, Pu 6.3 kN. Mounted height H1 37 mm includes the U 310 seat washer; the bearing alone is 34.3 mm high. reference speed 2,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 1200 g. Imperial cross-check for procurement drawings: 1.969 in bore, 3.74 in OD, 1.35 in height, and the 1200 g catalogue mass converts to 1.200 kg (42.3 oz). Envelope economics: the 34.3 mm axial height over a 22.5 mm radial section yields 2.4 kN of dynamic capacity per height millimetre, and the bearing weighs 1200 g for 81.9 kN C — about 15 g per rated kN. Bore-to-OD planning: OD 95 over bore 50 is a 1.90× step for this size, and the 34.3 mm height gives a bore/height ratio of 1.46; use these ratios when the housing recess around the 50 mm shaft is the first constraint. Minimum-load arithmetic: with dm ≈ 72.5 mm and factor A 0.19, Fam ≈ A·(n·dm/1000)² at the 2,400 r/min reference speed is about 5.8 kN for 53310; below that preload the balls skid and smear the tracks. Light-load floor: Pu = 6.3 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 53310; the number is 8 % of the 81.9 kN dynamic rating. Sphered-seating order-number note: the convex back face of the housing washer is finish-ground spherical and is delivered to mate with the separately ordered U seat washer, which presents a flat face to the housing and a concave face to the washer; together they accommodate initial static misalignment, but the pair must be kept clean, greased at the spherical interface and never replaced by a washer-on-flat-steel makeshift. Procurement reminder for this specific page: 53310 and U 310 are two order numbers shipping as two articles; the installed 37 mm H1 rather than 34.3 mm H is the dimension the housing drawing must carry.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The sphered housing washer of 53310 MUST run against the U 310 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 310 locks the aligning function and frets under load; re-grease the contact at every overhaul.
• Dimension the housing to the 37 mm mounted height H1 (bearing plus U 310), not the 34.3 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.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 53310 as the single sphered pressed steel execution; other order numbers of the 53310 size are different products and may carry different ratings or seating geometry — always quote the full designation including the U 310 seat washer when purchasing.