S/S Bolt Kit - 12pt. (5) 5/16-18 x 3.500

The S/S Bolt Kit - 12pt. (5) 5/16-18 x 3.500 from ARP delivers the fastening reliability that serious engine builders and performance mechanics demand when assembling high-stress drivetrain components. This stainless steel bolt kit is engineered for applications where corrosion resistance and precise clamping force are non-negotiable—whether you're rebuilding a marine engine, assembling an aluminum cylinder head on a modified engine, or securing critical fastening points in a custom fuel system. The five-piece configuration is ideal for rebuilding kits, prototype work, or completing specialty automotive and powersports projects where OEM fasteners fall short.

ARP's reputation in the fastener industry rests on their proprietary manufacturing process that ensures consistent tensile strength and dimensional accuracy across every bolt. The 12-point head design distributes clamping loads more evenly than traditional 6-point fasteners, reducing the risk of stripping and allowing for more precise torque application with a standard or crowfoot wrench. The 5/16-18 thread pitch and 3.500-inch length specification positions this kit for mid-range structural fastening—common in engine block work, intake manifold mounting, and transmission bell housing applications. Stainless steel construction provides superior corrosion resistance in harsh environments, making it ideal for marine, salt-air, or high-humidity engine bays where mild steel would degrade rapidly.

Professional mechanics, engine machinists, and automotive enthusiasts building high-performance or modified engines benefit most from this kit's precision tolerances and material integrity. The five-bolt quantity is perfect for sample work, test assembly, or completing a full fastening job when used alongside a larger ARP kit purchase. Always verify thread pitch and length compatibility with your specific engine block or component before installation, and reference ARP's recommended torque specifications for your particular application to achieve optimal clamping force without over-tightening.