Bolt Kit - 12pt. (5) 5/16-24 x 1.500

The ARP Bolt Kit – 12pt. (5) 5/16-24 x 1.500 is a set of five premium chromoly fasteners engineered for high-performance engine assembly and critical fastening applications. ARP (Applied Racing Products) specializes in precision fastening solutions for motorsports, performance builds, and demanding mechanical environments where standard hardware falls short. These 5/16-24 inch bolts feature a 1.5-inch length and 3/8-inch 12-point head design, optimized for tight clearance areas and applications requiring precise torque sequencing without fastener slippage.

Constructed from chromoly alloy steel with black oxide finish, this bolt kit delivers superior tensile strength and fatigue resistance compared to standard Grade 5 or Grade 8 fasteners. The 12-point head geometry provides multiple engagement angles, reducing the risk of rounding when working with tight tolerances or limited access. The 5/16-24 thread specification suits engine block work, intake manifold fastening, cylinder head applications, and other critical assemblies where precision and repeatability matter. Black oxide coating offers baseline corrosion resistance and improved grip under high clamp load conditions.

This kit is designed for engine builders, performance shops, motorsports competitors, and mechanics who demand consistency across a complete fastening job. The five-piece format provides enough hardware for a single critical assembly or serves as a test kit for larger projects. Universal fitment across multiple engine platforms makes this a practical stock item for shops managing diverse builds. Each bolt is manufactured to ARP's specifications for straightness, hardness, and thread accuracy, ensuring reliable installation and predictable preload under torque.

ARP fasteners are industry-standard in high-performance and racing applications where fastener failure creates significant risk. This bolt kit addresses the gap between mass-produced hardware and custom fastening solutions, offering vetted chromoly quality at reasonable per-piece cost.