Bolt Kit - 12pt - 5pk 3/8-16 x 4.250

The Bolt Kit - 12pt - 5pk 3/8-16 x 4.250 from ARP represents a precision fastening solution designed for demanding applications where critical joint integrity cannot be compromised. Whether you're building or maintaining tactical weapon systems, engine assemblies, or structural components requiring ultra-reliable fastening, this five-pack delivers OEM-grade ARP bolts engineered to exacting standards. Law enforcement armorers, military technicians, and civilian gunsmiths rely on ARP fasteners specifically because they eliminate the variables that plague standard hardware.

These 3/8-inch diameter bolts feature a robust 12-point head design that distributes clamping load across a wider contact surface, reducing stress concentration and preventing the rounding damage common with standard hex fasteners. The 16 threads-per-inch (TPI) specification provides fine thread engagement ideal for precision assemblies where vibration tolerance and repeatable torque values are non-negotiable—critical in firearm builds where component movement directly affects reliability and accuracy. At 4.250 inches in length, this sizing accommodates receiver assemblies, action screws, and structural frame attachments across modern tactical platforms. ARP's proprietary manufacturing process and quality control ensure tensile strength and corrosion resistance far exceeding commercial-grade hardware, translating to zero galling, consistent preload retention, and performance you can verify through multiple firing cycles.

This five-pack is ideal for AR platform builds, precision rifle assembly, or restocking an armory maintenance kit where multiple identical fastener applications demand consistency across firearms. The 12-point configuration is particularly valuable when working in tight receiver geometry where a standard hex socket may not fit without modification. Installation requires proper torque specification appropriate to your application and component material—consult ARP's torque tables or your firearm manufacturer's recommendations to achieve rated preload. Technicians benefit from stocking these bolts to ensure no mission-critical assembly uses compromised fasteners, maintaining zero-variance performance across your operational platforms.