53311 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 53311 model number is decoded

The 53300 series order number 53311 is a SKF single-direction thrust ball bearing for a 55 mm seat, built to ISO 104, with a sphered housing washer paired to a U seat washer, 55×105×39.3 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 11 decodes to 55 mm (code 11 × 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 55×105×39.3 mm (2.165×4.134×1.547 in), 25.0 mm radial section, C 101 kN, C0 224 kN, Pu 8.3 kN. Mounted height H1 42 mm includes the U 311 seat washer; the bearing alone is 39.3 mm high. reference speed 2,200 r/min (thermal) and limiting speed 3,000 r/min (mechanical), catalogue mass 1700 g. Speed planning separates the two ceilings mechanically: the pressed cage and balls tolerate 3,000 r/min while thermal balance under catalogue load sets the 2,200 r/min reference; at dm ≈ 80.0 mm the corresponding dn is approximately 240k mm·r/min. Load balance: C0 224 kN against C 101 kN gives a 2.22 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 8.3 kN enters the adjusted-life check. Sizing arithmetic on the 55 mm bore: 101 kN C over the 25.0 mm radial section gives 4.0 kN per section millimetre, and the 39.3 mm stack height is 1.57× that section — proportions typical of a 53300 thrust section. Light-load floor: Pu = 8.3 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 53311; the number is 8 % of the 101 kN dynamic rating. Mass and section check: 1700 g inside the 55×105×39.3 mm outline leaves a 25.0 mm radial section, and the 224 kN static rating is 2.22× the dynamic rating — plan static safety and minimum preload against those figures. 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 105 mm washer can tilt inside the U 311 seat; check the actual tilt allowance in the mounting drawing, since the 2.7 mm washer thickness step does not by itself quantify it.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Minimum axial load still applies with factor A 0.26: a self-aligning seat does not prevent ball skidding, so provide spring preload or sufficient rotor weight at light load and speed.
• 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.
• 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.
• Keep the sphered interface clean and lightly greased: scale, paint or grit between the washer back and U 311 locks the aligning function and frets under load; re-grease the contact at every overhaul.
• The 101/224 kN figures belong to 53311 specifically (the single sphered pressed steel execution of 53311); suffixed, sphered and counterpart-series order numbers are separate articles, and U 311 is ordered separately, so write the complete designation on the order and the maintenance record.