53204 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 53204 model number is decoded

The 53200 series order number 53204 is a SKF single-direction thrust ball bearing for a 20 mm seat, built to ISO 104, with a sphered housing washer paired to a U seat washer, 20×40×14.7 mm boundary dimensions. Three separable parts make the set: the tight-bore shaft washer that locates on the shaft, the loose-bore housing washer in its register, and the ball-cage assembly; load is purely axial and acts in one direction. the 3 in 53xxx replaces the flat-seat 1: it still denotes one load direction, but the housing washer is sphered for pairing with a U seat washer, and the following digit 2–4 ranks the section. bore code 04 decodes to 20 mm (code 04 × 5) under the same 00/01/02/03-exception, ×5 rule SKF uses across its coded bearing ranges. the suffix-free listing carries the catalogue default: a pressed (stamped sheet-steel) ball-cage assembly, light and quiet, used across the small and medium sizes. Envelope 20×40×14.7 mm (0.787×1.575×0.579 in), 10.0 mm radial section, C 21.2 kN, C0 37.5 kN, Pu 1.4 kN. Mounted height H1 17 mm includes the U 204 seat washer; the bearing alone is 14.7 mm high. reference speed 5,600 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 100 g. Static-first selection data: 37.5 kN C0 spread across the 14.7 mm stack gives 2.6 kN of static rating per height millimetre, and the 100 g mass/C0 ratio is about 3 g per static kN — crane-hook and screw positions are normally sized on these two figures. Speed planning separates the two ceilings mechanically: the pressed cage and balls tolerate 8,000 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 30.0 mm the corresponding dn is approximately 240k mm·r/min. At the printed limiting speed of 8,000 r/min the mean pitch diameter dm ≈ 30.0 mm implies a dn value around 240k mm·r/min; the 5,600 r/min reference speed is the thermal-planning value under catalogue load. Minimum-load arithmetic: with dm ≈ 30.0 mm and factor A 0.0085, Fam ≈ A·(n·dm/1000)² at the 5,600 r/min reference speed is about 240 N for 53204; below that preload the balls skid and smear the tracks. Imperial cross-check for procurement drawings: 0.787 in bore, 1.575 in OD, 0.579 in height, and the 100 g catalogue mass converts to 0.100 kg (3.5 oz). 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: 53204 and U 204 are two order numbers shipping as two articles; the installed 17 mm H1 rather than 14.7 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 0.0085: 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.
• Keep the sphered interface clean and lightly greased: scale, paint or grit between the washer back and U 204 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.
• The 21.2/37.5 kN figures belong to 53204 specifically (the single sphered pressed steel execution of 53204); suffixed, sphered and counterpart-series order numbers are separate articles, and U 204 is ordered separately, so write the complete designation on the order and the maintenance record.