Bolt Kit - 12pt 5pk 5/16-18 x 4.000

The Bolt Kit - 12pt 5pk 5/16-18 x 4.000 from ARP represents the gold standard for critical fastening applications in high-performance automotive builds. Whether you're assembling an engine, securing suspension components, or anchoring drivetrain hardware, these premium-grade bolts are engineered to handle the extreme pressures and vibration loads that stock fasteners simply cannot withstand. ARP bolts are the choice of professional engine builders, drag racers, and serious enthusiasts who demand reliability when it matters most.

Each 5/16-18 x 4.000 bolt in this five-pack features a 12-point head geometry that distributes clamping force more evenly than traditional hex fasteners, reducing the risk of thread stripping and fastener failure under thermal cycling and shock loads. ARP's proprietary heat treatment and alloy composition deliver superior tensile strength while maintaining ductility—critical for preventing catastrophic fastener breakage during high-RPM operation or aggressive acceleration. The precise 4.000-inch length accommodates deep-seated applications where standard fasteners fall short, ensuring proper engagement and maximum clamping load throughout the fastener's service life.

This kit is ideal for intake manifolds, accessory mounting, suspension pick-up points, and any critical assembly where vibration isolation and load retention are non-negotiable. Professional mechanics and fabricators specify ARP fasteners for engine rebuilds, stroker installations, turbocharger mounting, and chassis reinforcement projects. Always follow ARP's torque specifications for your specific application—proper preload is essential to achieve the performance and safety advantages these premium bolts deliver. The five-pack quantity suits single-component installation or serves as a reserve stock for future builds.