Trailer Axle Bearing Kit – 1.75" x 1.25" #42 Spindle with Oil Cap
Part Number: BK-8000-OC
Service kit for one hub on 8,000 lb axles from Dexter, AL-KO, Quality, and other manufacturers using a #42 spindle (1.75″ inner / 1.25″ outer bearing journals).
Product Overview
The BK-8000-OC Bearing and Seal Kit provides every wear component required to service a single oil-bath hub. It includes premium tapered roller bearings and races, a double-lip oil seal, and the three individual components of the oil-cap system — the metal cap, rubber inspection plug, and sealing O-ring — along with the proper tang washer and cotter pin for spindle nut retention.
Two kits are required per axle. For grease-lubricated hubs, use BK-8000-GC (grease-cap version).
Kit Contents
| Qty | Part No. | Description | Details |
|---|---|---|---|
| 1 | 02475 | Outer Bearing | 1.25″ ID — fits 02420 race |
| 1 | 02420 | Outer Race (Cup) | Matched to 02475 bearing cone |
| 1 | 25580 | Inner Bearing | 1.75″ ID — fits 25520 race |
| 1 | 25520 | Inner Race (Cup) | Matched to 25580 bearing cone |
| 1 | 10-63 (Aftermarket) | Oil Seal | 2.25″ ID × 3.38″ OD double-lip type — replaces Dexter 10-63 |
| 1 | 21-35 | Oil Cap (Metal) | Steel press-fit cap for Dexter 8K oil bath hubs |
| 1 | 46-32 | Rubber Inspection Plug | Removable fill plug for 21-35 cap (center opening ≈ 1″) |
| 1 | 10-45 | O-Ring Seal | Sits under 21-35 cap flange to seal against hub face (≈ 2.875″ OD) |
| 1 | 5-101 | Tang Washer | Locks spindle nut after final torque setting |
| 1 | 16549 | Cotter Pin | Secures castle nut through spindle groove |
Fitment & Use
- For #42 spindles with 1.75″ inner and 1.25″ outer bearing journals
- Rated for 8,000 lb axles using oil-bath hubs
- Compatible with Dexter, AL-KO, Quality, Axxis, and other major brands
- Works with EZ-Lube and Standard spindles
- Replaces OEM Dexter kit K08-200-90 and other aftermarket rebuild kits
- Each kit services one hub — order two for a complete axle
Technical Specifications
| Component | Measurement / Type |
|---|---|
| Spindle Type | #42 (1.75″ inner / 1.25″ outer) |
| Axle Capacity | 8,000 lbs per axle (4,000 lbs per hub) |
| Seal I.D. / O.D. | 2.25″ / 3.38″ (double-lip oil seal) |
| Bearing Type | Tapered roller — industry standard cones and cups |
| Lubrication System | Oil bath only (uses BK-8000-GC for greased hubs) |
Applications
- Flatbed and equipment trailers
- Gooseneck and pintle trailers
- Livestock and enclosed cargo trailers
- Heavy-duty RV and oil-bath axle systems
Note: Always verify bearing numbers stamped on your existing components before ordering. This is the oil-bath version (BK-8000-OC); for grease-lubricated axles, use BK-8000-GC.
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