Trailer Axle Bearing Kit – Fits #42 Spindle (1.75" × 1.25")
Part Number: BK3-100
This BK3-100 trailer axle bearing kit services one (1) hub on trailers using a #42 spindle found on most 5,200 lb and 6,000 lb axles, and on some 7,000 lb axles. It includes both bearings, both races, the grease seal, cotter pin, and tang/lock washer.
This kit is commonly used on axles from Dexter, AL-KO, Quality Trailer, and other manufacturers. To ensure compatibility, always check the bearing numbers stamped on your existing parts. Outer bearing sizes vary by hub model.
Features
- Complete one-hub service kit – order two kits per axle
- Fits most 5,200 lb & 6,000 lb axles using a standard #42 spindle
- Works with EZ-Lube and standard spindles
- Includes matched bearings and races for reliable performance
- Grease seal supplied is the 2.25" version used on most post-1999 axles
Specifications
| Specification | Detail |
|---|---|
| Outer Bearing | 15123 – 1.25" ID |
| Outer Race | 15245 – Fits 15123 |
| Inner Bearing | 25580 – 1.75" ID |
| Inner Race | 25520 – Fits 25580 |
| Grease Seal | 10-36 – 2.25" ID (most common; confirm if you need 2.125") |
| Additional Hardware | Cotter pin & tang/lock washer |
| Spindle Type | Standard #42 spindle |
Seal sizes, outer bearings, and some hub configurations vary by axle manufacturer. Always verify your bearing numbers or measure your race diameters before ordering. If you need the 2.125" seal instead of the included 2.25" version, please confirm prior to purchase.
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