8mm x 1.25 x 5/16 Stud 2.725 OAL w/Guide

The ARP 8mm x 1.25 x 5/16 Stud 2.725 OAL w/Guide is a precision-engineered fastener designed for high-performance engine and drivetrain applications where reliability under extreme load is non-negotiable. This chromoly stud serves as a critical component in engine block assembly, cylinder head bolting, and specialty automotive construction where dual-thread specifications and integrated guide features are required. Built to ARP's exacting standards, this stud is ideal for race engines, high-horsepower builds, and any application demanding superior clamp load consistency and fatigue resistance.

Manufactured from chromoly steel and finished in black oxide, the 8mm x 1.25 x 5/16 stud combines dual-thread geometry—featuring both 8mm x 1.25 and 5/16-24 inch threading—to accommodate universal fastening scenarios without requiring multiple part numbers. The 2.725-inch overall length and integrated guide provide exact positioning during assembly, reducing installation time and preventing thread cross-threading. Chromoly's superior tensile strength ensures consistent preload retention even under thermal cycling, vibration, and sustained high loads, while the black oxide finish offers corrosion resistance and reduced galling during installation.

This stud is sold individually and suits builders and technicians working on universal engine platforms, custom engine blocks, and motorsport applications where metric and SAE specifications must coexist. The guide feature ensures proper alignment in blind or tight-tolerance holes, making installation faster and more reliable in high-vibration environments. Compatible with any assembly requiring 8mm x 1.25 or 5/16-24 fastening, this ARP stud delivers the precision and durability expected in competition and street performance builds.