1/2 Stud - 4.250 Long Broached w/1.250 Thread

The 1/2 Stud - 4.250 Long Broached w/1.250 Thread is a precision fastening component engineered for demanding automotive and industrial engine assembly applications. Built to ARP's exacting standards, this chromoly stud is purpose-designed for critical fastening tasks where consistent clamping force and durability are non-negotiable. Whether you're rebuilding a high-performance engine, securing cylinder heads, or assembling structural components, this broached stud delivers the reliability that professional technicians and engine builders depend on.

Manufactured from chromoly steel and finished in black oxide, the 1/2 Stud - 4.250 Long Broached w/1.250 Thread provides superior strength-to-weight characteristics and corrosion resistance compared to standard steel fasteners. The broached design ensures precise dimensional consistency, critical for achieving uniform bolt preload across multiple fastening points. With a 1/2-inch diameter and 4.25-inch length, this stud accommodates both 1/2-13 and 1/2-20 thread pitch applications, offering compatibility across diverse engine and assembly configurations. The 1.250-inch threaded section provides ample engagement length for secure installation, while the broached construction minimizes stress concentration and improves fatigue resistance under cyclic loading.

Professional engine builders, race teams, and restoration shops choose ARP studs for mission-critical applications where fastener failure is not an option. This stud excels in high-heat environments and high-vibration scenarios where standard bolts may experience joint separation or fatigue failure. The universal design makes it suitable for cylinder head bolts, intake manifold bolts, and other heavy-duty fastening requirements in both naturally aspirated and forced-induction engine builds. Installation is straightforward—simply replace standard bolts with this precision stud and matching ARP nut for dramatically improved reliability and consistent preload characteristics that enhance engine longevity and performance.