Hex Head Bolt 5/16-18 x 3/4 Grade 5 10pk

The Hex Head Bolt 5/16-18 x 3/4 Grade 5 10pk from ALLSTAR PERFORMANCE is an essential fastener for engine builds, suspension work, and custom automotive projects where reliable clamping force and vibration resistance are non-negotiable. Whether you're assembling a stroker motor, fabricating a custom frame component, or securing critical drivetrain parts, these hex head bolts deliver the structural integrity required in high-stress applications. This 10-pack quantity makes them ideal for completing a full assembly without multiple ordering cycles.

Grade 5 classification guarantees a tensile strength of 120,000 PSI, making these bolts substantially stronger than standard Grade 2 fasteners and suitable for engine block work, intake manifold installation, and suspension geometry modifications. The 5/16-18 thread specification (5/16 inch diameter with 18 threads per inch) provides fine-pitch engagement that resists loosening under thermal cycling and vibration—critical when mounting components near exhaust heat or in high-RPM applications. The 3/4 inch length offers versatility across various mounting scenarios, from valve cover studs to accessory bracket installation.

Professional engine builders, restoration specialists, and weekend fabricators rely on Grade 5 hex bolts for repeatable, code-compliant assembly work where fastener failure could compromise engine sealing or structural safety. The fine 18-pitch thread is particularly valuable in aluminum head and block applications where coarse threads are prone to stripping. Always pair with appropriate washers and lock washers to maximize clamping load retention and extend the service life of your assembly.