Hex Head Bolt 1/2-13 x 4 Grade 5 5pk

The Hex Head Bolt 1/2-13 x 4 Grade 5 5pk from ALLSTAR PERFORMANCE delivers the fastening reliability that serious engine builders and fabricators demand for high-performance vehicle assembly. These bolts serve as critical structural fasteners in engine blocks, intake manifolds, transmission housings, and chassis reinforcement applications where vibration resistance and tensile strength are non-negotiable. Whether you're assembling a stroker motor, securing headers, or anchoring suspension components, this five-pack provides essential hardware for the job without compromise.

Grade 5 fasteners offer superior tensile strength compared to standard Grade 2 hardware, making them the choice for applications experiencing sustained stress and thermal cycling. The 1/2-13 thread specification—half-inch diameter with 13 threads per inch—provides robust engagement in cast iron and aluminum bosses common to engine and chassis work. With a 4-inch length, these bolts accommodate typical through-hole and boss-depth requirements found in block assemblies and mounting plates. ALLSTAR PERFORMANCE's manufacturing standards ensure consistent hardness and concentricity, eliminating the risk of stripped holes or failed fasteners under load.

Mechanics, engine builders, and fabricators working on domestic and import platforms benefit from Grade 5 bolts for engine dress assembly, manifold mounting, and structural reinforcement where factory fastener specifications call for mid-range tensile strength. Installation requires standard hex wrenches or impact sockets; torque to manufacturer specifications based on application (typically 70–90 ft-lbs for 1/2-13 fasteners depending on material and design). The five-pack format ensures you have spares for multiple assembly points or replacement inventory, reducing downtime on the shop floor.