Hex Head Bolt 1/2-13 x 2-1/2 Grade 5 10pk

The Hex Head Bolt 1/2-13 x 2-1/2 Grade 5 10pk from ALLSTAR PERFORMANCE is an essential fastener for engine builds, chassis assembly, and suspension work where reliable clamping force and vibration resistance are non-negotiable. Whether you're securing intake manifolds, mounting engine accessories, or fastening critical drivetrain components, this 10-pack provides the durability and consistency that serious engine builders and mechanics demand. Grade 5 fasteners deliver superior holding power compared to standard hardware, making them the preferred choice for high-vibration automotive applications where bolt failure could lead to catastrophic engine or drivetrain damage.

Grade 5 hex head bolts are manufactured to meet SAE J429 standards and feature a tensile strength rated at 120,000 PSI, offering significantly higher proof load than commodity fasteners. The 1/2-13 thread specification refers to a half-inch diameter with 13 threads per inch, providing optimal engagement in common engine block and intake port patterns used across domestic and imported platforms. The 2-1/2 inch length accommodates typical through-bolt applications in manifold mounting, accessory bracket installation, and suspension pickup points, while the hex head design allows secure torque application with standard wrenches—critical when establishing precise fastening sequences that prevent leaks and maintain structural integrity under thermal and mechanical stress.

Professional mechanics, performance engine builders, and restoration specialists rely on ALLSTAR PERFORMANCE fasteners for engine rebuilds, turbocharger installations, and custom motor mounts where bolt shear or loosening cannot be tolerated. The 10-pack quantity covers a typical intake manifold or cylinder head accessory installation with spares for future service work. Always follow OEM torque specifications for your specific application—Grade 5 bolts require proper tension sequencing to ensure even clamping load, prevent gasket compression failures, and maintain leak-free sealing on critical engine systems.