Bolt Kit - 12pt. (5) 8mm x 1.25 x 40mm

The Bolt Kit - 12pt. (5) 8mm x 1.25 x 40mm from ARP delivers premium fastening solutions for high-performance applications where reliability cannot be compromised. Designed for builders, engine builders, and motorsports enthusiasts who demand mission-critical strength, this five-piece bolt set addresses the need for OEM-quality fasteners in custom engine assembly, drivetrain work, and precision mechanical builds. ARP's reputation for superior fastening hardware makes this kit an essential component for anyone serious about durability and safety in performance applications.

Each bolt in this kit features a 12-point head design, which provides superior load distribution and reduced fastener stress compared to standard 6-point heads. The 8mm diameter with 1.25mm pitch threading ensures precise engagement and consistent clamping force, while the 40mm length accommodates mid-range applications across various engine and mechanical assemblies. ARP fasteners undergo rigorous quality control and material testing to guarantee tensile strength, fatigue resistance, and dimensional consistency that factory bolts often cannot match. The compact kit packaging (0.28 lbs, 3.05 x 0.65 x 5.9 inches) makes it convenient for storage and transport without sacrificing professional-grade construction.

This bolt kit is ideal for engine rebuilds, cylinder head work, intake manifold assembly, and other high-stress fastening scenarios where torque specifications demand repeatability and security. Professionals and serious hobbyists working on small-block and mid-sized engine platforms benefit most from ARP's precision fastening, especially in forced-induction or high-RPM builds where vibration and thermal cycling can loosen inferior hardware. Proper installation with ARP-recommended torque values and thread lubrication ensures maximum clamp load and fatigue life, making this kit a smart investment for any precision mechanical project that cannot tolerate fastener failure.