Hex Head Bolt 5/8-11 x 5 Grade 5

The Hex Head Bolt 5/8-11 x 5 Grade 5 from Allstar Performance is a precision fastener engineered for high-stress engine and chassis applications where reliability cannot be compromised. Whether you're assembling a competition engine, reinforcing suspension geometry, or securing critical drivetrain components, this bolt delivers the tensile strength and dimensional accuracy that separate professional builds from amateur work. Grade 5 fasteners are the standard choice across engine rebuilds, performance modifications, and structural repairs where failure is not an option.

Manufactured to exacting standards, the Hex Head Bolt 5/8-11 x 5 Grade 5 features a 5/8-inch diameter with an 11 threads-per-inch pitch and a 5-inch length, providing optimal grip and load distribution across mating surfaces. Grade 5 classification means this fastener meets SAE J429 specifications with a tensile strength of approximately 120,000 PSI, delivering superior corrosion resistance and holding power compared to Grade 2 alternatives. The hex head design allows for conventional wrench engagement and torque verification, critical when you need repeatable, calibrated fastening in engine blocks, transmission housings, or suspension brackets.

This bolt is ideal for mechanics and fabricators rebuilding small-block and big-block engines, upgrading suspension systems, or fabricating custom chassis components where medium-diameter fastening is required. The 5/8-11 sizing works across countless OEM and aftermarket applications—from block-to-intake manifold work to differential housing assembly. Always apply appropriate torque specifications per your engine manual or suspension design, use a quality torque wrench to ensure consistency, and consider thread-locking compound for vibration-prone applications to maximize longevity and safety.