53307 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 53307 model number is decoded

Listed in SKF 17000 chapter 5, 53307 is an ISO 104 single-direction thrust ball bearing, 35 mm bore and 68 mm OD, with a sphered housing washer and U seat washer, standing 25.6 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 07: bore 35 mm (code 07 × 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 35×68×25.6 mm (1.378×2.677×1.008 in), 16.5 mm radial section, C 49.4 kN, C0 96.5 kN, Pu 3.55 kN. Mounted height H1 28 mm includes the U 307 seat washer; the bearing alone is 25.6 mm high. reference speed 3,200 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 460 g. Minimum-load arithmetic: with dm ≈ 51.5 mm and factor A 0.048, Fam ≈ A·(n·dm/1000)² at the 3,200 r/min reference speed is about 1.3 kN for 53307; below that preload the balls skid and smear the tracks. Static-first selection data: 96.5 kN C0 spread across the 25.6 mm stack gives 3.8 kN of static rating per height millimetre, and the 460 g mass/C0 ratio is about 5 g per static kN — crane-hook and screw positions are normally sized on these two figures. Pitch-diameter arithmetic: dm = (35+68)/2 = 51.5 mm; at the 4,500 r/min limiting speed that corresponds to roughly 232k 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 49.4 kN dynamic rating corresponds to roughly 0.31 kN/mm of π·dm track, a useful comparison against the other dimension series of the 35 mm bore. Washer-stack proportions: the U 307 seat washer adds 2.4 mm to the 25.6 mm bearing height for a mounted H1 of 28 mm, while the 16.5 mm radial section against 35 mm bore (section/bore ≈ 0.47) identifies the envelope. 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. The aligning angle is set by how far the sphered back of the 68 mm washer can tilt inside the U 307 seat; check the actual tilt allowance in the mounting drawing, since the 2.4 mm washer thickness step does not by itself quantify it.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the sphered interface clean and lightly greased: scale, paint or grit between the washer back and U 307 locks the aligning function and frets under load; re-grease the contact at every overhaul.
• 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.
• Dimension the housing to the 28 mm mounted height H1 (bearing plus U 307), not the 25.6 mm bearing height H — confusing the two is a recurring drawing error for the 53-series.
• Minimum axial load still applies with factor A 0.048: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• The 49.4/96.5 kN figures belong to 53307 specifically (the single sphered pressed steel execution of 53307); suffixed, sphered and counterpart-series order numbers are separate articles, and U 307 is ordered separately, so write the complete designation on the order and the maintenance record.