The Dayton Parts 13-3012L is a high-performance outer cap nut specifically designed for stud-piloted (Budd-style) dual wheel configurations where aluminum wheels are used. These nuts are engineered from durable carbon steel to match the fit and function of original equipment hardware. Featuring a Left-Hand (Counterclockwise) thread, this fastener is intended for the driver’s side of the vehicle to ensure maximum safety and prevent loosening under the stress of heavy-duty operation.
Direct Replacement: Designed to match the fit, function, and performance of OEM hardware on specified commercial vehicles.
Durable Construction: Manufactured to strict specifications using high-strength carbon steel for reliable, long-term service life.
Yellow Zinc Finish: Provides superior resistance to corrosion, road salt, and moisture.
Conical 90° Seat: Engineered for precise seating and uniform clamping force on the wheel surface.
Open-End Design: Allows for through-stud applications, ensuring full thread engagement.
| Attribute | Specification |
| Thread Size | 1-1/8" - 16 (Fine) |
| Thread Direction | Counterclockwise (Left Hand) |
| Hex Size (Drive) | 38 mm (approx. 1-1/2") |
| Seat Style | Conical Seat (90 Degree) |
| Overall Length | 0.88 in |
| Material | Carbon Steel |
| Color/Finish | Yellow Zinc |
| Grade Type | Standard Replacement |
The 13-3012L is a direct premium replacement for a wide range of industry part numbers:
| Manufacturer | Part Number |
| Euclid / Meritor | E-5552L, E-5977L, R005552L, R005977L |
| Paccar (Kenworth/Peterbilt) | W14, W14BK, W747, TBWA015L |
| White / Volvo | 300248, A300248X |
| IHC / International | 83156H |
| Mack | 21AX96 |
| Fruehauf | 534765 |
| Gunite | 34272 |
| Webb | 178921 |
| Ford | BB1135 |
| GMC | 3735549 |
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