54312 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 54312 model number is decoded

Listed in SKF 17000 chapter 5, 54312 is an ISO 104 double-direction thrust ball bearing, 50 mm bore and 110 mm OD, with a sphered housing washer and U seat washer, standing 70.7 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 54312 is 50 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 50×110×70.7 mm (1.969×4.331×2.783 in), 30.0 mm radial section, C 101 kN, C0 224 kN, Pu 8.3 kN. Mounted height H1 78 mm includes the U 312 seat washer; the bearing alone is 70.7 mm high. reference speed 1,500 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 2900 g. Speed band width for this size is 700 r/min between reference and limiting (1.47× ratio); lubrication, preload and heat removal decide where inside that band 54312 can actually run. Speed-ratio note for this exact unit: the reference speed is 1,500 r/min against a 2,200 r/min limiting speed, a reference-to-limit ratio of 0.68. 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. Light-load floor: Pu = 8.3 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 54312; the number is 8 % of the 101 kN dynamic rating. Preload at the mechanical ceiling: repeating Fam ≈ A·(n·dm/1000)² with factor A 0.26 at the 2,200 r/min limiting speed raises the required axial preload to about 8.1 kN; the reference-speed value 3.7 kN is the thermal design point. 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 50×110×70.7 mm the bearing carries C0 224 kN bidirectionally, but the two U interfaces share that load only if each is free to seat; torque the covers so the 7.3 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 224 kN static-rated set.
• Order TWO seat washers for 54312 — the designation U 312 pairs with one side and a second U washer (same number) with the other; the catalogue 78 mm H1 includes both.
• Minimum load factor A 0.26 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 101/224 kN figures belong to 54312 specifically (the double sphered pressed steel execution of 54312); suffixed, sphered and counterpart-series order numbers are separate articles, and U 312 is ordered separately, so write the complete designation on the order and the maintenance record.