53315 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 53315 model number is decoded

Listed in SKF 17000 chapter 5, 53315 is an ISO 104 single-direction thrust ball bearing, 75 mm bore and 135 mm OD, with a sphered housing washer and U seat washer, standing 48.1 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 15: bore 75 mm (code 15 × 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 75×135×48.1 mm (2.953×5.315×1.894 in), 30.0 mm radial section, C 163 kN, C0 390 kN, Pu 14 kN. Mounted height H1 52 mm includes the U 315 seat washer; the bearing alone is 48.1 mm high. reference speed 1,700 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 3200 g. Track-circle loading: per millimetre of mean track circumference the 163 kN dynamic rating corresponds to roughly 0.49 kN/mm of π·dm track, a useful comparison against the other dimension series of the 75 mm bore. Capacity density: 163 kN C from 3.200 kg of bearing steel gives about 50.9 kN per kilogram; static density is correspondingly 121.9 kN/kg at C0 390 kN. Stack/annulus proportions: the 48.1 mm axial stack over the 9,896 mm² washer annulus gives 4.86 mm of height per annular square millimetre ×10⁻³, and at 3200 g the bearing holds about 121.9 kN of C0 per kilogram. Pitch-diameter arithmetic: dm = (75+135)/2 = 105.0 mm; at the 2,400 r/min limiting speed that corresponds to roughly 252k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Rating split for documentation: dynamic 163 kN (L10 life), static 390 kN (safety factor s0), fatigue limit 14 kN (adjusted life) — three different uses of three different numbers for 53315, 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. The aligning angle is set by how far the sphered back of the 135 mm washer can tilt inside the U 315 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 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 shaft washer remains the tight, ground-bore component on the 75 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 315 into the register.
• The sphered housing washer of 53315 MUST run against the U 315 seat washer, a separate order number; mounted bare on a flat register, the convex back makes point contact that gouges the housing under load.
• Replacement orders must list both 53315 and U 315: the seat washer is a separate article, and a U washer of the wrong size narrows the contact band of the 390 kN static-rated set.
• The 163/390 kN figures belong to 53315 specifically (the single sphered pressed steel execution of 53315); suffixed, sphered and counterpart-series order numbers are separate articles, and U 315 is ordered separately, so write the complete designation on the order and the maintenance record.