54309 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 54309 model number is decoded

Listed in SKF 17000 chapter 5, 54309 is an ISO 104 double-direction thrust ball bearing, 35 mm bore and 85 mm OD, with a sphered housing washer and U seat washer, standing 56.2 mm high before installation. Construction is a five-component stack: one central shaft washer with tracks on both faces, two outward-facing housing washers and two cage sets, which lets one housing recess accept thrust from either direction. note the bore of 54309 is 35 mm by the dimension table: the double-direction series was deliberately aligned to the 51/53 washer sets with shifted codes, so the familiar 04=20 arithmetic does not apply here. 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 35×85×56.2 mm (1.378×3.346×2.213 in), 25.0 mm radial section, C 76.1 kN, C0 153 kN, Pu 5.6 kN. Mounted height H1 62 mm includes the U 309 seat washer; the bearing alone is 56.2 mm high. reference speed 1,900 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 1600 g. Load balance: C0 153 kN against C 76.1 kN gives a 2.01 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 5.6 kN enters the adjusted-life check. Bore-to-OD planning: OD 85 over bore 35 is a 2.43× step for this size, and the 56.2 mm height gives a bore/height ratio of 0.62; use these ratios when the housing recess around the 35 mm shaft is the first constraint. Mass and section check: 1600 g inside the 35×85×56.2 mm outline leaves a 25.0 mm radial section, and the 153 kN static rating is 2.01× the dynamic rating — plan static safety and minimum preload against those figures. Light-load floor: Pu = 5.6 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 54309; the number is 7 % of the 76.1 kN dynamic rating. Imperial cross-check for procurement drawings: 1.378 in bore, 3.346 in OD, 2.213 in height, and the 1600 g catalogue mass converts to 1.600 kg (56.4 oz). Bidirectional self-aligning note: TWO U seat washers are required for this order number, one behind each housing washer, and the catalogue H1 height includes them on both sides of the stack; the spherical interfaces accept initial misalignment in either load direction but are not pivots for continuous oscillation. At 35×85×56.2 mm the bearing carries C0 153 kN bidirectionally, but the two U interfaces share that load only if each is free to seat; torque the covers so the 5.8 mm-per-side washer steps are not pre-clamped.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The two spherical interfaces accommodate initial misalignment in either load direction but must stay clean, greased and static — continuous rocking frets the sphered contacts of even the 153 kN static-rated set.
• Replacement ordering is THREE numbers: 54309 plus two pieces of U 309; quoting only the bearing leaves the sphered backs running on bare registers.
• Minimum load factor A 0.12 applies to both load directions, and both brass pressed cage sets need lubricant reaching the upper track on a vertical shaft.
• Assembly is a five-component stack (central shaft washer, two cage sets, two sphered housing washers) plus the two U seat washers in the housing registers; dry-build the arrangement by hand first to confirm both sides swivel freely.
• The 76.1/153 kN figures belong to 54309 specifically (the double sphered pressed steel execution of 54309); suffixed, sphered and counterpart-series order numbers are separate articles, and U 309 is ordered separately, so write the complete designation on the order and the maintenance record.