Project Kics WCB383R 38mm Compression Bolt Set Red M12x1.25 (20 Pieces)

The Project Kics WCB383R is a 20-piece compression bolt set engineered to enhance the security and appearance of your open-ended racing lug nuts. Designed specifically for use with Project Kics R40 and other compatible open-ended lug nuts, these 38mm compression bolts feature a vibrant red anodized finish that adds a distinctive accent to your wheel setup.

Advanced Locking Technology:

Each compression bolt incorporates a built-in steel ball and spring mechanism housed within a precision-machined aluminum body. When threaded into the top of your lug nut, this innovative design creates a compression force against the wheel stud, significantly reducing the risk of lug nut loosening under demanding driving conditions. The spring-loaded action provides a washer-like effect that maintains consistent pressure on the fastener assembly.

Key Specifications:

• Thread size: M12 x 1.25mm pitch
• Overall length: 38mm
• Finish: Red anodized aluminum
• Quantity: 20 pieces per set
• Maximum torque: 4 N·m (0.4 kgf·m)
• Requires minimum 8mm thread depth inside lug nut
• 6mm hex drive (L-type wrench included)

Extended Stud Appearance:

The 38mm length is designed to protrude beyond the face of compatible open-ended lug nuts, creating the aesthetic of extended wheel studs without the need for actual stud modification. This provides a clean, motorsport-inspired look while adding functional security.

Installation Notes:

Compression bolts must be installed after the lug nuts are already secured to the vehicle. Use the included 6mm hex L-wrench for installation, and ensure you have adequate thread engagement (minimum 8mm) within the lug nut. For wheel removal, remove the compression bolt first, then the lug nut. Regular inspection and retightening is recommended to maintain optimal security.

Manufactured in Japan by KYO-EI Corporation, Project Kics products are built to exceed OEM standards and are trusted by professional racing teams and automotive enthusiasts worldwide. These compression bolts are compatible with open-ended Project Kics lug nuts and other brands with similar internal thread specifications.