53217 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 53217 model number is decoded

The 53200 series order number 53217 is a SKF single-direction thrust ball bearing for a 85 mm seat, built to ISO 104, with a sphered housing washer paired to a U seat washer, 85×125×33.1 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 17 decodes to 85 mm (code 17 × 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 85×125×33.1 mm (3.346×4.921×1.303 in), 20.0 mm radial section, C 97.5 kN, C0 275 kN, Pu 9 kN. Mounted height H1 37 mm includes the U 217 seat washer; the bearing alone is 33.1 mm high. reference speed 2,000 r/min (thermal) and limiting speed 3,000 r/min (mechanical), catalogue mass 1500 g. Rating split for documentation: dynamic 97.5 kN (L10 life), static 275 kN (safety factor s0), fatigue limit 9 kN (adjusted life) — three different uses of three different numbers for 53217, none interchangeable with another. Imperial cross-check for procurement drawings: 3.346 in bore, 4.921 in OD, 1.303 in height, and the 1500 g catalogue mass converts to 1.500 kg (52.9 oz). Speed band width for this size is 1,000 r/min between reference and limiting (1.50× ratio); lubrication, preload and heat removal decide where inside that band 53217 can actually run. Washer-stack proportions: the U 217 seat washer adds 3.9 mm to the 33.1 mm bearing height for a mounted H1 of 37 mm, while the 20.0 mm radial section against 85 mm bore (section/bore ≈ 0.24) identifies the envelope. Envelope economics: the 33.1 mm axial height over a 20.0 mm radial section yields 2.9 kN of dynamic capacity per height millimetre, and the bearing weighs 1500 g for 97.5 kN C — about 15 g per rated kN. 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 125 mm washer can tilt inside the U 217 seat; check the actual tilt allowance in the mounting drawing, since the 3.9 mm washer thickness step does not by itself quantify it.

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 53217 and U 217: the seat washer is a separate article, and a U washer of the wrong size narrows the contact band of the 275 kN static-rated set.
• Keep the sphered interface clean and lightly greased: scale, paint or grit between the washer back and U 217 locks the aligning function and frets under load; re-grease the contact at every overhaul.
• Minimum axial load still applies with factor A 0.39: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• The 97.5/275 kN figures belong to 53217 specifically (the single sphered pressed steel execution of 53217); suffixed, sphered and counterpart-series order numbers are separate articles, and U 217 is ordered separately, so write the complete designation on the order and the maintenance record.