3/8-16 Stud 1.250 Long Broached

The ARP 3/8-16 Stud 1.250 Long Broached (MPN AJ1.250-5B) is a precision fastener engineered for high-performance engine assembly and critical mechanical applications where reliability under load is non-negotiable. Built from chromoly steel and finished in black oxide, this broached stud delivers the tensile strength and corrosion resistance required in demanding motorsports, racing, and industrial environments where standard fasteners fall short.

The 3/8-16 thread specification provides proven compatibility with common fastening applications, while the 1.250-inch length accommodates engine blocks, cylinder heads, and structural assemblies where thread engagement depth is critical. ARP's broaching process creates precise internal geometry that ensures consistent clamping force distribution and eliminates fastener relaxation—a defining performance advantage over conventional studs. The chromoly material resists fatigue cracking under cyclic loading, and black oxide coating provides protection against oxidation in both wet and high-temperature environments typical of racing and rebuild work.

This fastener is specified for engine builders, race mechanics, and powersports technicians assembling competition or high-output engines where joint integrity directly affects performance and safety. ARP studs are the industry standard in drag racing, road racing, and performance marine applications where traditional hardware cannot survive sustained power and vibration. Each stud ships individually, allowing builders to replace fasteners selectively or purchase complete sets for full engine assembly.

Whether rebuilding an engine for maximum reliability or assembling a competition platform, the ARP 3/8-16 broached stud represents a measurable upgrade over OEM fastening. The combination of chromoly strength, precision broaching, and black oxide durability makes this an essential component for any serious engine work.