Bolt Kit - 12pt. (5) 3/8-16 x 3.250

The Bolt Kit - 12pt. (5) 3/8-16 x 3.250 by ARP is a precision fastener assembly engineered for critical structural applications in tactical, automotive, and industrial environments. This five-piece bolt kit delivers the reliability demanded by law enforcement and military personnel who depend on equipment that performs under extreme conditions. ARP fasteners are the standard choice wherever failure is not an option—whether securing optic mounts, rail systems, or other load-bearing components on duty gear and platforms.

Each bolt in this kit features a 12-point head design that provides superior grip geometry and distributes load more evenly than traditional six-point fasteners, reducing the risk of stripping or slippage under recoil or impact. The 3/8-16 specification denotes a 3/8-inch diameter with 16 threads per inch, while the 3.250-inch length accommodates standard mounting depths found in tactical rail systems and accessory interfaces. ARP's manufacturing process ensures consistent tolerances and material hardness, critical for maintaining zero on optics and ensuring repeatable performance across training cycles and operational deployment.

This bolt kit is ideal for securing picatinny rail accessories, scope mounts, and foregrip systems on rifles, carbines, and modular tactical platforms. The 12-point head design is particularly valuable in confined spaces where standard wrench angles are limited, a common constraint when working with modern ergonomic designs. Weighing just 0.65 pounds, the five-bolt set provides redundancy for multi-point installations while remaining lightweight enough for field maintenance kits. Ensure compatibility with your specific rail interface standard and mounting hardware before installation, and apply appropriate thread-locking compound to prevent vibration-induced loosening during sustained fire or extended operations.