0.63 Bolt Kit 3 - Bolt Install for Coupler
Ensure dependable mounting of your trailer coupler or tow ring using the 0.63 Bolt Kit 3. Featuring three 5/8" Grade 8 bolts with full locking hardware, this kit is engineered for high-stress applications like adjustable channels, OEM production lines, fleet repairs, and DIY installations.
Features
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High-Strength Bolts: Three 5/8"–11 × 2½″ Grade 8 hex-head bolts, offering superior clamp force and resistance to shear
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Locking Hardware Included: Each bolt comes with a matching lock nut and flat washer to prevent loosening under vibration
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Durable Finish: Zinc-plated for corrosion resistance and long service life
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OEM-Grade Reliability: Kit mirrors specifications of trusted models like the Croft K5825G8 (four-bolt set)
Specifications
| Component | Specification |
|---|---|
| Bolt Size | 5/8″–11 × 2½″ (Grade 8 hex head) |
| Quantity | Bolts: 3 Lock Nuts: 3 Washers: 3 |
| Washer Type | 5/8″ hardened flat washer |
| Finish | Zinc-plated (corrosion-resistant) |
| Material | High-strength alloy steel (Grade 8) |
| Torque Rating | Equivalent to OEM coupling hardware |
Benefits
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Exceptional Strength: Grade 8 bolts deliver trusted performance in towing applications
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Secure & Vibration-Resistant: Lock nuts and washers maintain torque under load
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Convenient Ready-to-Use Kit: Everything needed in one box—no extras to source
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Factory-Level Quality: Meets or exceeds standard hardware used by OEMs such as Croft
Ideal For
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Installing or servicing adjustable-channel couplers and lunette rings
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OEM production requiring consistent, high-grade fasteners
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Shops and DIYers seeking reliable, heavy-duty coupling hardware