1/2 Stud - 3.800 Long Broached

The ARP 1/2 Stud - 3.800 Long Broached (AR3.800-1LB) is a precision-engineered chromoly stud designed for high-stress fastening applications in automotive and powersports assemblies. Measuring 3.8 inches in length with a 1/2-inch diameter, this broached stud is available with both 1/2-13 and 1/2-20 thread pitches, accommodating diverse assembly requirements. The black oxide finish provides corrosion resistance and a professional appearance suitable for engine blocks, cylinder heads, and structural components where reliable clamping force is critical.

Chromoly construction delivers superior strength-to-weight characteristics compared to standard steel fasteners, enabling tighter torque specifications and reduced risk of fastener failure under thermal cycling and vibration. The broached design—where the stud hole is precisely sized during manufacturing—ensures exact fit and eliminates the need for additional finishing, reducing installation time and minimizing dimensional variation. At 0.19 pounds per unit, this stud remains lightweight while maintaining the load-carrying capacity demanded by high-performance applications. The universal configuration makes it compatible with standard 1/2-inch threaded receptacles across multiple platforms.

Builders and machinists working on engine rebuilds, cylinder head assemblies, and performance modifications rely on ARP studs to prevent thread stripping, galling, and catastrophic fastener failure. The 3.8-inch length provides sufficient engagement depth for secure mounting while fitting within space-constrained engine compartments. Whether assembling race engines, marine powerplants, or off-road platforms, this broached stud delivers the precision and durability required when standard fasteners prove inadequate.