1/2 Stud - 6.600 Long Broached w/1.250 Thread

The ARP 1/2 Stud - 6.600 Long Broached with 1.250 Thread (part number AR6.600-1LGB) is a precision-engineered fastener designed for demanding mechanical assemblies where standardized studs fall short. This broached stud combines a 1/2-inch diameter with dual thread specifications—compatible with both 1/2-13 and 1/2-20 threads—making it a versatile choice for engine builds, transmission housings, and critical structural joints that require exacting tolerances.

At 6.6 inches in length, this stud accommodates thick material stacks and deep mounting applications while maintaining adequate thread engagement. The broached design ensures consistent dimensional accuracy and reduces stress concentration points during installation—critical for applications where cyclic loading or vibration is present. Black oxide finish provides baseline corrosion resistance suitable for internal engine compartments and controlled environments. The chromoly material composition delivers the tensile strength and fatigue resistance required in high-performance mechanical systems.

Engineers and builders specify ARP fasteners when OEM hardware proves inadequate—typically in engine rebuilds, supercharger installations, transmission modifications, and race applications where component longevity depends on fastener reliability. The dual-thread capability eliminates the need to stock multiple part numbers, streamlining inventory for shops running mixed platform builds. Each stud ships individually, allowing you to purchase exact quantities needed without waste.

ARP has established itself as the industry standard for critical fastening in motorsports and engine performance, where failures are costly and reputation-defining. This 1/2 stud represents the same engineering discipline applied to a universal-fit configuration suited for custom fabrication, restoration, and specialized mechanical work where precision fastening directly impacts system integrity.