53224 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 53224 model number is decoded

Listed in SKF 17000 chapter 5, 53224 is an ISO 104 single-direction thrust ball bearing, 120 mm bore and 170 mm OD, with a sphered housing washer and U seat washer, standing 40.8 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 24: bore 120 mm (code 24 × 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 120×170×40.8 mm (4.724×6.693×1.606 in), 25.0 mm radial section, C 127 kN, C0 390 kN, Pu 11.8 kN. Mounted height H1 46 mm includes the U 224 seat washer; the bearing alone is 40.8 mm high. reference speed 1,500 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 3200 g. Selection figures for 53224: the C0/C ratio is 3.07, Pu 11.8 kN is about 9 % of C, and the catalogue mass works out to roughly 27 g per millimetre of bore; the printed minimum-load factor is A 1. Static-first selection data: 390 kN C0 spread across the 40.8 mm stack gives 9.6 kN of static rating per height millimetre, and the 3200 g mass/C0 ratio is about 8 g per static kN — crane-hook and screw positions are normally sized on these two figures. Washer-stack proportions: the U 224 seat washer adds 5.2 mm to the 40.8 mm bearing height for a mounted H1 of 46 mm, while the 25.0 mm radial section against 120 mm bore (section/bore ≈ 0.21) identifies the envelope. Mass and section check: 3200 g inside the 120×170×40.8 mm outline leaves a 25.0 mm radial section, and the 390 kN static rating is 3.07× the dynamic rating — plan static safety and minimum preload against those figures. Washer-annulus check: the π/4·(D²−d²) contact annulus of 53224 covers about 11,388 mm², distributing C0 390 kN over a mean track circle of π·dm ≈ 456 mm. 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: 53224 and U 224 are two order numbers shipping as two articles; the installed 46 mm H1 rather than 40.8 mm H is the dimension the housing drawing must carry.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Minimum axial load still applies with factor A 1: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• 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.
• The shaft washer remains the tight, ground-bore component on the 120 mm shaft; the sphered part is the HOUSING washer, and the U seat washer is the loose flat-backed part — the fitting order is shaft washer and cage set first, then housing washer and U 224 into the register.
• 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 53224 as the single sphered pressed steel execution; other order numbers of the 53224 size are different products and may carry different ratings or seating geometry — always quote the full designation including the U 224 seat washer when purchasing.