The Timken SET52 is a pre-matched tapered roller bearing set consisting of a 25580 cone (inner race with rollers) and a 25520 cup (outer race). Supplied as a factory-matched pair, it delivers the correct running clearance straight out of the box — no mixing and matching of loose races. SET52 is the standard replacement for the A52 interchange and is widely used in trailer hubs, agricultural equipment, and light-duty industrial shafting.
Specifications
- Set number: SET52
- Cone (inner race): 25580
- Cup (outer race): 25520
- Bore: 1.750 in (44.45 mm)
- Outside diameter: 3.265 in (82.93 mm)
- Assembled width: 0.9375 in (23.81 mm)
- Type: TS single-row tapered roller bearing, imperial series
- Brand: Timken
Interchange & cross-reference
Commonly cross-referenced as A52, SET 52, 25580/25520, and 25580-25520. Always confirm bore, outside diameter, and width against your existing bearing before ordering.
Typical applications
- Boat, utility, and cargo trailer wheel hubs with a 1-3/4" spindle
- Agricultural implement wheels and idler assemblies
- Light industrial gearboxes, pulleys, and shaft supports
- Any assembly calling for a 25580 cone paired with a 25520 cup
Why buy Timken
Timken tapered roller bearings are precision-ground to tight tolerances and case-carburized for fatigue resistance under combined radial and thrust loading. Buying the matched SET52 rather than separate races helps ensure correct seating and predictable bearing life.
Sold as one complete set: one 25580 cone and one 25520 cup.