52305 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 52305 model number is decoded

The 52300 series order number 52305 is a SKF double-direction thrust ball bearing for a 20 mm seat, built to ISO 104, with a flat housing seating surface, 20×52×34 mm boundary dimensions. Inside the unit sit a single central shaft washer with a ground interference bore, two outward-facing loose housing washers and two independent ball-cage assemblies, so axial force is reacted in both directions from one housing recess. bore-coding caveat: on 52/54 double-direction bearings the last two digits are an order-number code, not ×5 millimetres — this size carries a 20 mm bore per the ISO 104 table, and guessing from the code gives the wrong shaft. 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 20×52×34 mm (0.787×2.047×1.339 in), 16.0 mm radial section, C 34.5 kN, C0 60 kN, Pu 2.24 kN. reference speed 3,200 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 330 g. Section proportions: the 16.0 mm radial section compares with 20 mm of bore (section/bore ≈ 0.80) and the 34 mm height is 2.13× that section — the proportions that identify the 52300 envelope at a glance. Static-first selection data: 60 kN C0 spread across the 34 mm stack gives 1.8 kN of static rating per height millimetre, and the 330 g mass/C0 ratio is about 6 g per static kN — crane-hook and screw positions are normally sized on these two figures. Imperial cross-check for procurement drawings: 0.787 in bore, 2.047 in OD, 1.339 in height, and the 330 g catalogue mass converts to 0.330 kg (11.6 oz). Capacity density: 34.5 kN C from 0.330 kg of bearing steel gives about 104.5 kN per kilogram; static density is correspondingly 181.8 kN/kg at C0 60 kN. Load balance: C0 60 kN against C 34.5 kN gives a 1.74 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 2.24 kN enters the adjusted-life check. 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 20 mm bore and 34 mm overall height the unit drops into one recess where a mirrored single-direction pair would need two seats; both loose 52 mm housing washers must remain free to slide during thermal movement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Service both cage sets together: replacing only the noisy side while leaving the worn 60 kN opposite track in place reproduces the failure within weeks — inspect both shaft-washer faces and both loose washers at removal.
• Observe the stack order at fitting: shaft washer central, the two housing washers facing outwards with a cage set on each side; the 34 mm total height is not twice a single-direction bearing height, so reuse of old cover dimensions is a trap.
• Torque the cover to leave the catalogue axial freedom, never solid: a clamped double-direction stack cannot float to its thermal position, and at 4,500 r/min even a small thermal thrust preload smears the hottest track.
• Where shaft and housing cannot be kept square, the sphered 54-series execution of the same bore with two U seat washers is the self-aligning counterpart; the flat 52300 unit has no alignment capacity.
• Ordering discipline for 52305: the catalogue page quotes 52305 and its 34.5/60 kN ratings as one exact article; bare-number substitutions from another series or brand need a fresh dimension and rating check, not a like-for-like assumption.