The Dayton 06-231 is a precision-stamped spindle nut lock washer designed for Rockwell and Meritor trailer axles. Engineered to match the exact fit and function of the original factory hardware, this washer is an essential safety component for manual-adjust wheel ends, providing the mechanical lock necessary to prevent spindle nuts from loosening during operation.
Direct Replacement: Specifically designed to replace the factory washer on Rockwell RN, TN, and TKN series axles.
Integrated Locking Tab: Features a specialized tab designed for tapered spindles to ensure a secure, "walk-proof" installation.
Durable Construction: Manufactured from high-grade materials to withstand the heavy-duty demands of trailer wheel ends and resist fatigue.
Trustworthy Quality: Part of the Dayton line, backed by over a century of automotive expertise and U.S.-based product engineering.
| Attribute | Value |
| Part Number | 06-231 |
| Part Type | Spindle Nut Washer |
| Washer Type | Flat with Locking Tab |
| Inner Diameter (ID) | 2.37 in |
| Outer Diameter (OD) | 4.00 in |
| Thickness (Height) | .06 in |
| Axle Application | Rockwell RN, TN, TKN (Manual Adjust) |
| Spindle Type | Tapered |
| Kit Compatibility | Component of Kit 06-2231 |
| Weight | .10 LBS |
This washer is a direct interchange for the following industry part numbers:
| Manufacturer | Part Number | Notes |
| Meritor | R003010 | Primary OE Reference |
| Euclid | E3010 | Aftermarket Lock Washer |
| VMRS | 011-001-017 | Industry Standard Code |
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