0.63 Bolt Kit 4 - Bolt Install for Coupler
The 0.63 Bolt Kit 4 delivers everything you need to securely mount a trailer coupler or tow ring to an adjustable channel. Featuring heavy-duty Grade 8 bolts and hardware, this kit is ideal for OEM builds, service shops, or do-it-yourself maintenance where reliability counts.
Features
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Complete Hardware Set: Comes with 4 Grade 8 bolts, lock nuts, and lock washers—no need to source separate fasteners
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Heavy-Duty Strength: 5/8″–11 x 2½″ Grade 8 hex bolts designed to withstand high clamping force and resist loosening under load
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Corrosion-Resistant Finish: Zinc or chromate plating helps protect fasteners from rust and wear
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Vehicle-Grade Security: Lock washers and lock nuts ensure components stay tight even during heavy-duty towing
Specifications
| Component | Specification |
|---|---|
| Bolt Size | 5/8″–11 × 2½″ hex head, Grade 8 |
| Quantity | Bolts: 4 Nuts: 4 Lock Washers: 4 |
| Material | High-strength alloy steel |
| Finish | Zinc/chrome plated |
| Torque Rating | Equivalent to OEM-grade fasteners |
| Use Case | Mounting couplers or tow rings to adjustable trailer channel |
Why Choose This Kit
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Built to Last: Grade 8 bolts offer exceptional shear strength and clamp force, maintaining integrity in heavy-duty applications
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Secure Fit: Lock washers and nuts minimize the risk of hardware loosening due to vibration
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Time-Saving Convenience: A ready-to-use kit ensures compatibility and consistency with OEM specifications
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Quality-Driven: Meets high manufacturing standards for trailer coupling installations
Ideal For
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Manufacturers performing OEM coupler or tow ring installs
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Fleet- or shop-level maintenance teams replacing worn hardware
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DIY users seeking reliable, industry-grade parts
This kit fits on coupler part numbers 2003728, 2004642, & 2011811