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.

Kit Includes:

• 2 – 1B10080 Bolts (0.63″, Grade 8, 225 lb-ft torque)
• 2 – 1T10 Nuts
• 2 – 4B10 Washers

Features

• High-Strength Bolts: Three 5/8″–11 × 2½″ Grade 8 hex-head bolts, offering superior clamp force and resistance to shear

• Locking Hardware Included: Each bolt comes with a matching lock nut and flat washer to prevent loosening under vibration

• Durable Finish: Zinc-plated for corrosion resistance and long service life

• OEM-Grade Reliability: Kit mirrors specifications of trusted models like the Croft K5825G8 (four-bolt set)

Specifications

Benefits

• Exceptional Strength: Grade 8 bolts deliver trusted performance in towing applications

• Secure & Vibration-Resistant: Lock nuts and washers maintain torque under load

• Convenient Ready-to-Use Kit: Everything needed in one box—no extras to source

• Factory-Level Quality: Meets or exceeds standard hardware used by OEMs such as Croft

Ideal For

• Installing or servicing adjustable-channel couplers and lunette rings

• OEM production requiring consistent, high-grade fasteners

• Shops and DIYers seeking reliable, heavy-duty coupling hardware

This kit fits on coupler part numbers &