53209 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 53209 model number is decoded

The 53200 series order number 53209 is a SKF single-direction thrust ball bearing for a 45 mm seat, built to ISO 104, with a sphered housing washer paired to a U seat washer, 45×73×21.3 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 09 decodes to 45 mm (code 09 × 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 45×73×21.3 mm (1.772×2.874×0.839 in), 14.0 mm radial section, C 39 kN, C0 86.5 kN, Pu 3.2 kN. Mounted height H1 24 mm includes the U 209 seat washer; the bearing alone is 21.3 mm high. reference speed 3,400 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 390 g. Mass and section check: 390 g inside the 45×73×21.3 mm outline leaves a 14.0 mm radial section, and the 86.5 kN static rating is 2.22× the dynamic rating — plan static safety and minimum preload against those figures. Capacity density: 39 kN C from 0.390 kg of bearing steel gives about 100.0 kN per kilogram; static density is correspondingly 221.8 kN/kg at C0 86.5 kN. At the printed limiting speed of 4,800 r/min the mean pitch diameter dm ≈ 59.0 mm implies a dn value around 283k mm·r/min; the 3,400 r/min reference speed is the thermal-planning value under catalogue load. Sizing arithmetic on the 45 mm bore: 39 kN C over the 14.0 mm radial section gives 2.8 kN per section millimetre, and the 21.3 mm stack height is 1.52× that section — proportions typical of a 53200 thrust section. Rating split for documentation: dynamic 39 kN (L10 life), static 86.5 kN (safety factor s0), fatigue limit 3.2 kN (adjusted life) — three different uses of three different numbers for 53209, none interchangeable with another. 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: 53209 and U 209 are two order numbers shipping as two articles; the installed 24 mm H1 rather than 21.3 mm H is the dimension the housing drawing must carry.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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 53209 and U 209: the seat washer is a separate article, and a U washer of the wrong size narrows the contact band of the 86.5 kN static-rated set.
• 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.
• Minimum axial load still applies with factor A 0.038: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• The 39/86.5 kN figures belong to 53209 specifically (the single sphered pressed steel execution of 53209); suffixed, sphered and counterpart-series order numbers are separate articles, and U 209 is ordered separately, so write the complete designation on the order and the maintenance record.