The Dayton 06-221 is a high-precision inner spindle nut designed for "Positive" adjustment systems on Meritor axles. Engineered for heavy-duty performance, this nut ensures the critical alignment and retention of wheel end components on RL, RN, RQ, TK, TKL, and TKN series axles.
| Attribute | Value |
| Part Number | 06-221 |
| Application | Meritor RL/RN/RQ/TK/TKL/TKN Axles |
| Adjustment Type | Manual Adjustment |
| Thread Size | 2.37-16 in |
| Thickness | 0.500" |
| Position | Inner Spindle Nut |
Precision Threading: Manufactured with $2\text{-}3/8" \text{-} 16$ threads to provide a secure, vibration-resistant fit on the spindle.
Heavy-Duty Construction: Built to withstand the high torque requirements and axial loads typical of commercial trucking and trailer operations.
System Compatibility: Specifically designed for use in Meritor's "Positive" adjustment wheel end systems, ensuring proper bearing preload and extended wheel end life.
This part is a direct replacement for the following industry part numbers:
| Manufacturer | Part Number | Notes |
| Meritor | 1227B678 | OEM Replacement |
| Euclid | E-1253 / E1253 | Aftermarket Interchange |
| Batco | 06-221 | Equivalent |
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