Secure and streamline your trailer coupler installation with the 0.63 Bolt Kit 5—a 5/8″ Grade 8 bolt kit engineered for adjustable channel or coupler mounts. Ideal for OEM-style assembly, aftermarket upgrades, and on-the-road repairs requiring trusted, heavy-duty fasteners.
Kit Includes
- 4 – 1A10028 Bolts (0.63″, Grade 5, 150 lb-ft torque)
- 4 – 6F10 Nuts
Features
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Complete Grade 8 Hardware: Each kit includes 5 bolts, nuts, and washers—ready for immediate installation
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Heavy-Duty 5/8″ Bolts: Grade 8, fine-thread bolts resist loosening and shear failure under load
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Locking Nuts Included: Nylon-insert lock nuts prevent strip and seal in high-vibration environments
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Ideal for Adjustable Channels: Designed to fit standard 5/8″ coupler and tow-ring mounting holes
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Corrosion-Resistant Finish: Zinc or electro-galvanized coating protects against rust
Specifications
| Component | Specification |
|---|---|
| Bolt Size | 5/8″ (0.63″)–18 NF, Grade 8 |
| Quantity | Bolts: 4 Nuts: 4 |
| Bolt Length | 4½ in |
| Nuts | 5/8″ nylon-insert lock nuts |
| Washers | 5/8″ hardened flat washers |
| Finish | Zinc or electro-galvanized |
| Material | High-strength alloy steel (Grade 8) |
| Torque Rating | OEM-level clamp force |
| Use Case | Mounting trailer couplers and tow rings using adjustable channel |
Why Choose This Kit
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OEM-Quality Safety: Grade 8 hardware meets or exceeds manufacturer specs—engineered to maintain tight torque even under vibration
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One-and-Done Convenience: Includes everything needed for installation—eliminates downtime searching for parts
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Built for Rough Conditions: Zinc coatings and hardened steel prevent corrosion and provide long-term reliability
Compatible With
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Adjustable channel couplers from Dexter, Demco, Buyers, Curt, et al.
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5/8″ mounting hole trailer couplers, lunette rings, and tow-ring plates
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This kit fits on coupler part numbers
