Hex Head Bolt 5/8-11 x 3-1/2 Grade 5 5pk

The Hex Head Bolt 5/8-11 x 3-1/2 Grade 5 5pk from ALLSTAR PERFORMANCE delivers the critical fastening hardware that serious engine builders and suspension technicians depend on for high-vibration applications. These Grade 5 bolts are engineered for motorsports, performance upgrades, and heavy-duty mechanical work where standard hardware simply won't survive. Whether you're assembling a stroker motor, fabricating custom brackets, or reinforcing suspension geometry, this five-pack provides the reliable anchoring required when tolerances are tight and reliability is non-negotiable.

Grade 5 fasteners possess a tensile strength of 120,000 PSI, substantially higher than standard Grade 2 hardware, making them resistant to shear stress, vibration loosening, and thermal cycling common in engine bays and drivetrain systems. The 5/8-inch diameter with an 11-threads-per-inch pitch provides ample clamping force for applications demanding secure, repeatable assembly. Each hex head design allows straightforward installation with standard wrenches or sockets, eliminating the need for specialty tools while ensuring consistent torque application across all five bolts in the pack. The robust dimensions (3-1/2 inches in length) accommodate through-bolting in thick stock, manifold mounting, and structural fabrication work.

Performance enthusiasts, race engine builders, and transmission specialists frequently spec Grade 5 bolts for bellhousing fasteners, water pump mounting, intake manifold assembly, and custom frame reinforcement. The five-bolt quantity addresses most single-point projects or allows inventory for multiple repairs; however, larger fabrication jobs may require ordering multiple packs. Always verify thread pitch and length against OEM specifications or custom drawing requirements before installation, and apply appropriate threadlocker and torque values according to Grade 5 fastening standards for your specific application.