The Dayton 06-370 is a high-strength castle-style spindle nut engineered for heavy-duty steer axles with tapered spindles. Designed to match the fit and function of original equipment on Rockwell FH and FL series axles, this nut provides the secure, adjustable clamping force necessary for critical steering components.
Direct Replacement: Matches the factory dimensions and thread pitch for a seamless installation on specified years, makes, and models.
Castle Nut Design: Features a 6-point notched (castle) top, allowing for precise bearing adjustment and secure locking with a cotter pin or safety wire.
Durable Construction: Manufactured from premium materials to withstand metal fatigue and ensure a long service life under heavy steering loads.
Ideal Repair Solution: A reliable replacement for an original nut that is missing, stripped, or damaged during routine wheel-end maintenance.
Proven Quality: Backed by Dayton’s century-long reputation for automotive excellence and a US-based team of product specialists.
| Specification | Details |
| Part Number | 06-370 |
| Nut Type | Castle Nut (6-Point) |
| Thread Size | 1.75-12 in |
| Across the Flats | 2.62 in |
| Height | 1.37 in |
| Axle Application | Steer Axle (Rockwell FH, FL) |
| Spindle Type | Tapered |
| Safety Rating | 1 |
| Weight | 1.30 lbs |
| Associated Kit | 06-3701 |
This spindle nut serves as a direct interchange for the following industry part numbers:
Rockwell (Meritor): 1227-Y-571 / 1227Y571
Spicer: 12448 / 12-448
PACCAR: L1338
VMRS Code: 011-001-016
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
