52409 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 52409 model number is decoded

52409 is SKF's 35 mm-bore double-direction thrust ball bearing in the 52400 series to the ISO 104 dimension plan, with a flat housing seating surface, measuring 35×100×72 mm. 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 35 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 35×100×72 mm (1.378×3.937×2.835 in), 32.5 mm radial section, C 124 kN, C0 240 kN, Pu 9 kN. reference speed 1,600 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 2700 g. Track-circle loading: per millimetre of mean track circumference the 124 kN dynamic rating corresponds to roughly 0.58 kN/mm of π·dm track, a useful comparison against the other dimension series of the 35 mm bore. Speed band width for this size is 600 r/min between reference and limiting (1.38× ratio); lubrication, preload and heat removal decide where inside that band 52409 can actually run. Light-load floor: Pu = 9 kN is the equivalent-load threshold below which the SKF adjusted-life equation credits very long life for 52409; the number is 7 % of the 124 kN dynamic rating. Sizing arithmetic on the 35 mm bore: 124 kN C over the 32.5 mm radial section gives 3.8 kN per section millimetre, and the 72 mm stack height is 2.22× that section — proportions typical of a 52400 thrust section. Mass and section check: 2700 g inside the 35×100×72 mm outline leaves a 32.5 mm radial section, and the 240 kN static rating is 1.94× the dynamic rating — plan static safety and minimum preload against those figures. 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. Life accounting for 52409 is done separately per direction: if duty applies 124 kN C predominantly one way, the idle side's skid risk — not the loaded side's L10 — usually sets the relubrication and preload interval.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not replace a 52409 with two single-direction 51-series bearings without re-checking the arrangement: envelope heights, seat details and catalogue ratings differ, even at the same 35×100 mm bore and OD.
• Torque the cover to leave the catalogue axial freedom, never solid: a clamped double-direction stack cannot float to its thermal position, and at 2,200 r/min even a small thermal thrust preload smears the hottest track.
• Service both cage sets together: replacing only the noisy side while leaving the worn 240 kN opposite track in place reproduces the failure within weeks — inspect both shaft-washer faces and both loose washers at removal.
• The central shaft washer takes the interference fit on the 35 mm shaft while both outer housing washers run loose in their registers; both loose washers need positive axial retention on vertical shafts.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 52409 as the double flat pressed steel execution; other order numbers of the 52409 size are different products and may carry different ratings or seating geometry — always quote the full designation when purchasing.