Bolt Kit - 12pt. (5) 3/8-16 x 2.250

The Bolt Kit - 12pt. (5) 3/8-16 x 2.250 from ARP is a precision fastener set engineered for critical applications in tactical, automotive, and industrial environments where reliability under extreme conditions is non-negotiable. This five-piece kit contains 3/8-inch diameter bolts with 12-point heads—a design favored by firearms manufacturers, engine builders, and equipment assemblers who require repeatable torque application and zero slippage during high-stress assembly and disassembly cycles. Whether securing upper receiver components, action screws, or mounting hardware, these bolts deliver the dependability professionals demand.

Manufactured from chromoly steel and finished in black oxide, the Bolt Kit - 12pt. (5) 3/8-16 x 2.250 resists corrosion while maintaining structural integrity in field conditions where rust and oxidation pose real threats to equipment longevity. The 12-point head geometry distributes clamping force across a wider contact surface, reducing wear on fastening tools and minimizing the risk of bolt head rounding—a critical advantage when working with precision equipment in austere environments. At 2.25 inches in length with a 3/8-16 thread pitch, this kit accommodates standard receiver dimensions and mounting patterns found across military-spec and civilian tactical platforms, with the chromoly composition providing superior fatigue resistance compared to standard steel alternatives.

Law enforcement armorers, military technicians, and tactical gunsmithing professionals rely on ARP fasteners for duty weapon maintenance, rifle builds, and equipment assembly where bolt failure is simply not an option. The universal design of this five-bolt kit makes it ideal for stocking maintenance kits, replacement sets, or batch assembly work on multiple platforms. Installation is straightforward—torque to specification using a 12-point socket, and secure with appropriate washers and lock mechanisms per your platform's manufacturer guidance. Keep this kit on hand for critical repairs, builds, and preventive maintenance where OEM fastener quality directly impacts operational reliability.