S/S Bolt Kit - 6pt. (5) 3/8-16 x 4.500

The S/S Bolt Kit - 6pt. (5) 3/8-16 x 4.500 from ARP is a critical fastening component engineered for high-performance engine assembly, machine shop work, and precision tactical/military equipment builds. This stainless steel bolt kit is purpose-built for applications where corrosion resistance, thread reliability, and load-bearing integrity are non-negotiable—whether you're assembling rifle uppers, engine blocks, or precision machinery that demands OEM-grade fasteners.

Each kit contains five (5) Grade 8 stainless steel bolts with full hex heads and 6-point geometry, sized at 3/8-16 UNC with a shank length of 4.500 inches. The 6-point head design distributes impact and rotational forces evenly across the bolt face, reducing the risk of stripping or rounding during installation and removal cycles. Stainless steel construction provides superior corrosion resistance compared to standard plated carbon steel, making these fasteners ideal for outdoor tactical applications, military field operations, and environments with high moisture or salt exposure. The precise 3/8-16 UNC thread pitch ensures compatibility with standard military and civilian specification tapping, while the 4.500-inch length accommodates deep-reach mounting scenarios common in AR-platform assembly and heavy machinery.

Professional armorers, gunsmiths, and military equipment technicians rely on ARP fastener kits for critical builds where bolt failure is not an option. This kit is ideal for upper receiver assembly, rail mounting systems, and any load-bearing connection requiring repeatable torque specs and long-term reliability. Always torque to manufacturer specifications—typically 25–35 foot-pounds for 3/8-16 connections in aluminum receivers—and use thread-locking compound on critical assemblies exposed to vibration or field handling. Stock this kit in your armory or shop for emergency replacements or builds where OEM-grade fasteners are mandatory.