54306 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 54306 model number is decoded

54306 is SKF's 25 mm-bore double-direction thrust ball bearing in the 54300 series to the ISO 104 dimension plan, with a sphered housing washer paired to a U seat washer, measuring 25×60×41.3 mm U 306 seat washer companion included in the mounted H1 dimension. The unit stacks one central shaft washer (ground bore, tight on the shaft), two outward-facing housing washers and two ball-cage assemblies, reacting axial force in both directions. double-direction 52/54 numbering does NOT decode the bore by the usual single-direction ×5 code — read the 25 mm bore from the dimension table; codes recur across the 522/523/524 sections and systematically trail the 51/53 code values. 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 25×60×41.3 mm (0.984×2.362×1.626 in), 17.5 mm radial section, C 35.8 kN, C0 65.5 kN, Pu 2.4 kN. Mounted height H1 46 mm includes the U 306 seat washer; the bearing alone is 41.3 mm high. reference speed 2,800 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 580 g. Speed band width for this size is 1,000 r/min between reference and limiting (1.36× ratio); lubrication, preload and heat removal decide where inside that band 54306 can actually run. Capacity density: 35.8 kN C from 0.580 kg of bearing steel gives about 61.7 kN per kilogram; static density is correspondingly 112.9 kN/kg at C0 65.5 kN. Imperial cross-check for procurement drawings: 0.984 in bore, 2.362 in OD, 1.626 in height, and the 580 g catalogue mass converts to 0.580 kg (20.5 oz). Stack/annulus proportions: the 41.3 mm axial stack over the 2,337 mm² washer annulus gives 17.67 mm of height per annular square millimetre ×10⁻³, and at 580 g the bearing holds about 112.9 kN of C0 per kilogram. Pitch-diameter arithmetic: dm = (25+60)/2 = 42.5 mm; at the 3,800 r/min limiting speed that corresponds to roughly 162k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. 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. Bill of materials for this page is 54306 plus TWO × U 306; the 46 mm H1 stack sits in a housing whose two register faces should be machined in one clamping to keep both spherical axes coincident.

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 65.5 kN static-rated set.
• Order TWO seat washers for 54306 — the designation U 306 pairs with one side and a second U washer (same number) with the other; the catalogue 46 mm H1 includes both.
• Replacement ordering is THREE numbers: 54306 plus two pieces of U 306; quoting only the bearing leaves the sphered backs running on bare registers.
• 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 35.8/65.5 kN figures belong to 54306 specifically (the double sphered pressed steel execution of 54306); suffixed, sphered and counterpart-series order numbers are separate articles, and U 306 is ordered separately, so write the complete designation on the order and the maintenance record.