Hex Head Bolt 1/2-20 x 2-1/2 Grade 5 5pk

The Hex Head Bolt 1/2-20 x 2-1/2 Grade 5 5pk from ALLSTAR PERFORMANCE is a precision fastener engineered for high-stress automotive and engine building applications where reliability cannot be compromised. These bolts are purpose-built for engine assembly, suspension upgrades, and performance modifications where standard hardware simply won't handle the demands of increased horsepower or structural reinforcement. Whether you're assembling a rebuilt engine block, securing structural supports, or fastening critical drivetrain components, Grade 5 fasteners provide the strength margin required in serious motorsports and custom builds.

Grade 5 hex head bolts deliver approximately 85% of the tensile strength of Grade 8 hardware while maintaining superior cost efficiency for most applications. The 1/2-20 thread specification indicates a 1/2-inch diameter shaft with 20 threads per inch—a coarse pitch standard that resists vibration loosening under engine bay conditions and repeated thermal cycling. At 2-1/2 inches in length, this size accommodates standard engine block holes, carburetor mounting surfaces, and intake manifold fastener patterns common to small-block and mid-sized V8 builds. The five-pack quantity ensures you have spares for future projects while maintaining uniform fastener composition across critical connection points.

Mechanics and engine builders rely on ALLSTAR PERFORMANCE Grade 5 bolts for carburetor mounting, timing cover attachment, valley pan fastening, and transmission bellhousing work where vibration and thermal stress demand consistent material properties. These fasteners are compatible with any engine platform requiring 1/2-20 coarse-pitch hardware and work equally well in street engines, race builds, and restoration projects. Always torque to manufacturer specifications for your specific application and consider using threadlocker on fasteners subject to constant vibration for maximum security and peace of mind during break-in and extended operation.