53313 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 53313 model number is decoded

The 53300 series order number 53313 is a SKF single-direction thrust ball bearing for a 65 mm seat, built to ISO 104, with a sphered housing washer paired to a U seat washer, 65×115×39.4 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 13 decodes to 65 mm (code 13 × 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 65×115×39.4 mm (2.559×4.528×1.551 in), 25.0 mm radial section, C 106 kN, C0 240 kN, Pu 8.8 kN. Mounted height H1 43 mm includes the U 313 seat washer; the bearing alone is 39.4 mm high. reference speed 2,000 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 1900 g. Sizing arithmetic on the 65 mm bore: 106 kN C over the 25.0 mm radial section gives 4.2 kN per section millimetre, and the 39.4 mm stack height is 1.58× that section — proportions typical of a 53300 thrust section. Stack/annulus proportions: the 39.4 mm axial stack over the 7,069 mm² washer annulus gives 5.57 mm of height per annular square millimetre ×10⁻³, and at 1900 g the bearing holds about 126.3 kN of C0 per kilogram. Imperial cross-check for procurement drawings: 2.559 in bore, 4.528 in OD, 1.551 in height, and the 1900 g catalogue mass converts to 1.900 kg (67.0 oz). Minimum-load arithmetic: with dm ≈ 90.0 mm and factor A 0.3, Fam ≈ A·(n·dm/1000)² at the 2,000 r/min reference speed is about 9.7 kN for 53313; below that preload the balls skid and smear the tracks. Speed planning separates the two ceilings mechanically: the pressed cage and balls tolerate 2,800 r/min while thermal balance under catalogue load sets the 2,000 r/min reference; at dm ≈ 90.0 mm the corresponding dn is approximately 252k 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. Procurement reminder for this specific page: 53313 and U 313 are two order numbers shipping as two articles; the installed 43 mm H1 rather than 39.4 mm H is the dimension the housing drawing must carry.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The shaft washer remains the tight, ground-bore component on the 65 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 313 into the register.
• Minimum axial load still applies with factor A 0.3: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• Replacement orders must list both 53313 and U 313: the seat washer is a separate article, and a U washer of the wrong size narrows the contact band of the 240 kN static-rated set.
• The sphered housing washer of 53313 MUST run against the U 313 seat washer, a separate order number; mounted bare on a flat register, the convex back makes point contact that gouges the housing under load.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 53313 as the single sphered pressed steel execution; other order numbers of the 53313 size are different products and may carry different ratings or seating geometry — always quote the full designation including the U 313 seat washer when purchasing.