Description
Stemco 449-4973 Pro-Torq axle spindle nut for drive-axle wheel ends — one-piece design with integrated keeper that delivers precise, controlled bearing adjustment. Fits 3-1/4–12 spindle threads on Meritor, Dana / Spicer, and Eaton drive axles. Eight-point external flange installed with a 4-3/8 in 8-point socket. Outer cup / cone 580 / 572.
Specifications
| Manufacturer | Stemco |
|---|---|
| Part Number | 449-4973 |
| Part Type | Pro-Torq Axle Spindle Nut (with keeper) |
| Axle Position | Drive axle |
| Thread | 3-1/4–12 |
| Drive | 8-point external flange — requires 4-3/8 in 8-point socket |
| Outer Bearing Cup / Cone | 580 / 572 |
| Replacement Keeper | Stemco 450-4973 |
Applications
Used as the wheel-end retaining nut on:
- Meritor drive axles using 3-1/4–12 spindle thread
- Dana / Spicer drive axles using 3-1/4–12 spindle thread
- Eaton drive axles using 3-1/4–12 spindle thread
Representative applications: Class 8 tractors and straight trucks using Meritor RT-, RP-, RS-series, Dana D-series, and Eaton DS / DST drive axles.
Verify spindle thread size and bearing cup/cone before ordering — Stemco offers Pro-Torq nuts in multiple thread / flange sizes for trailer, steer, and drive positions. Use Stemco’s Pro-Torq installation procedure (75 ft-lb seat, back off, retorque to 200 ft-lb final) to set bearing endplay.
