52320 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 52320 model number is decoded

Listed in SKF 17000 chapter 5, 52320 is an ISO 104 double-direction thrust ball bearing, 85 mm bore and 170 mm OD on a flat housing seat, standing 97 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 52320 is 85 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 85×170×97 mm (3.346×6.693×3.819 in), 42.5 mm radial section, C 225 kN, C0 570 kN, Pu 18.3 kN. reference speed 1,000 r/min (thermal) and limiting speed 1,400 r/min (mechanical), catalogue mass 8950 g. Sizing arithmetic on the 85 mm bore: 225 kN C over the 42.5 mm radial section gives 5.3 kN per section millimetre, and the 97 mm stack height is 2.28× that section — proportions typical of a 52300 thrust section. Speed band width for this size is 400 r/min between reference and limiting (1.40× ratio); lubrication, preload and heat removal decide where inside that band 52320 can actually run. Imperial cross-check for procurement drawings: 3.346 in bore, 6.693 in OD, 3.819 in height, and the 8950 g catalogue mass converts to 8.950 kg (315.7 oz). Load balance: C0 570 kN against C 225 kN gives a 2.53 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 18.3 kN enters the adjusted-life check. Envelope economics: the 97 mm axial height over a 42.5 mm radial section yields 2.3 kN of dynamic capacity per height millimetre, and the bearing weighs 8950 g for 225 kN C — about 40 g per rated kN. Double-direction order-number note: the unit is built around one central shaft washer with a ground bore and tracks on both faces, flanked by two housing washers and two independent ball-cage assemblies; observe the assembly orientation (the two housing washers face outwards) and note that a 52-series unit replaces a mirrored pair of 51-series bearings only after the stack height and seat drawings are re-checked. At 85 mm bore and 97 mm overall height the unit drops into one recess where a mirrored single-direction pair would need two seats; both loose 170 mm housing washers must remain free to slide during thermal movement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Each direction independently needs the minimum axial load (factor A 1.9): the side that is momentarily unloaded during slow reversal skids first, so arrange preload or symmetry rather than assuming the loaded side drives the idle side.
• The central shaft washer takes the interference fit on the 85 mm shaft while both outer housing washers run loose in their registers; both loose washers need positive axial retention on vertical shafts.
• Service both cage sets together: replacing only the noisy side while leaving the worn 570 kN opposite track in place reproduces the failure within weeks — inspect both shaft-washer faces and both loose washers at removal.
• Do not replace a 52320 with two single-direction 51-series bearings without re-checking the arrangement: envelope heights, seat details and catalogue ratings differ, even at the same 85×170 mm bore and OD.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 52320 as the double flat pressed steel execution; other order numbers of the 52320 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.