53215 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 53215 model number is decoded

53215 is SKF's 75 mm-bore single-direction thrust ball bearing in the 53200 series to the ISO 104 dimension plan, with a sphered housing washer paired to a U seat washer, measuring 75×110×28.3 mm U 215 seat washer companion included in the mounted H1 dimension. The separable set comprises a shaft washer (ground bore, tight fit on the shaft), a loose-bore housing washer and one ball-cage assembly, reacting axial force in one direction and carrying no radial load. in the 53xxx designation the 3 marks a single-direction bearing whose housing washer has a sphered (convex) seating surface, intended to run against the matching U seat washer; the third digit 2–4 grades the section. the final two digits 15 encode the bore as 75 mm (code 15 × 5), the standard SKF bore-code rule shared with radial bearings. with no cage suffix this is the standard execution with a stamped sheet-steel ball-cage assembly (pressed cage) — the light, quiet and economical cage for small and medium thrust-ball sizes. Envelope 75×110×28.3 mm (2.953×4.331×1.114 in), 17.5 mm radial section, C 63.7 kN, C0 170 kN, Pu 6.2 kN. Mounted height H1 32 mm includes the U 215 seat washer; the bearing alone is 28.3 mm high. reference speed 2,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 1000 g. Rating split for documentation: dynamic 63.7 kN (L10 life), static 170 kN (safety factor s0), fatigue limit 6.2 kN (adjusted life) — three different uses of three different numbers for 53215, none interchangeable with another. Speed-ratio note for this exact unit: the reference speed is 2,400 r/min against a 3,400 r/min limiting speed, a reference-to-limit ratio of 0.71. Stack/annulus proportions: the 28.3 mm axial stack over the 5,085 mm² washer annulus gives 5.57 mm of height per annular square millimetre ×10⁻³, and at 1000 g the bearing holds about 170.0 kN of C0 per kilogram. Bore-to-OD planning: OD 110 over bore 75 is a 1.47× step for this size, and the 28.3 mm height gives a bore/height ratio of 2.65; use these ratios when the housing recess around the 75 mm shaft is the first constraint. Speed planning separates the two ceilings mechanically: the pressed cage and balls tolerate 3,400 r/min while thermal balance under catalogue load sets the 2,400 r/min reference; at dm ≈ 92.5 mm the corresponding dn is approximately 315k mm·r/min. 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 110 mm washer can tilt inside the U 215 seat; check the actual tilt allowance in the mounting drawing, since the 3.7 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 53215 and U 215: the seat washer is a separate article, and a U washer of the wrong size narrows the contact band of the 170 kN static-rated set.
• Dimension the housing to the 32 mm mounted height H1 (bearing plus U 215), not the 28.3 mm bearing height H — confusing the two is a recurring drawing error for the 53-series.
• Minimum axial load still applies with factor A 0.17: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 53215 as the single sphered pressed steel execution; other order numbers of the 53215 size are different products and may carry different ratings or seating geometry — always quote the full designation including the U 215 seat washer when purchasing.