The Stemco 450‑4723 is the official keeper designed for use with the Pro‑Torq® axle spindle nut system—certified to secure wheel bearings with precision for trailer axles featuring 3.480″‑12” threads.
| Spec | Details |
|---|---|
| Thread Size | 3.480″ – 12 TPI (threads per inch) |
| Compatible Bearing Set | HM518445 / HM518410 |
| Socket Size | 4‑13/16″ – 8‑point OTC socket #1941 |
| Material | Spring steel with corrosion-resistant coating |
| Application | Pro‑Torq nut keeper for trailer axles (e.g., Fruehauf Pro‑par, Meritor TP) |
| Weight | Approx. 2 oz (~0.1 lb) |
Stemco: STE450‑4723, STM4504723
Ceromet: K3250
Aftermarket equivalent: NSI/M‑5218‑K
Precision locking: Ensures infinite locking points in 0.001″ increments—maintains accurate bearing preload
Superior support: Works with the bold 3.480″ thread, heavy-duty bearings, and large axles—widely used in trailer applications
Durable design: High-strength spring steel endure torque and vibration—ideal for long hauls and rugged conditions
Nut Assembly: Stemco 447‑4723 Pro-Torq nut
Axle Types: Fruehauf Pro‑Par, Meritor TP, Eaton EST trailers
Brother Keepers: Also fits 447‑4724 nut systems
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