Socket Head Bolts 5/16-18 x 1-1/2in 5pk

ALLSTAR PERFORMANCE Socket Head Bolts 5/16-18 x 1-1/2in 5pk are Grade 5 fasteners designed for applications requiring reliable, precision-engineered hardware. The 5/16-18 thread specification and 1-1/2-inch length serve a wide range of assembly, repair, and fabrication tasks where strength and corrosion resistance are non-negotiable. Each pack contains five bolts finished in black oxide, a proven coating that protects against rust and oxidation in shop, garage, and field environments.

Grade 5 steel bolts deliver approximately 65% of the tensile strength of Grade 8, making them the standard choice for general structural fastening, equipment assembly, and machinery repair where moderate stress loads apply. The socket head (Allen head) design provides a clean, recessed interface that resists stripping when torqued with the correct hex key, and the black oxide finish offers superior adhesion compared to plating, reducing flaking in high-vibration applications. The 5/16-18 UNC thread is a common industrial standard, ensuring compatibility with standard nuts, washers, and pre-tapped holes across automotive, marine, construction, and equipment platforms.

Buyers choosing ALLSTAR PERFORMANCE hardware typically operate in demanding environments—vehicle restoration, engine assembly, equipment maintenance, and fabrication work where fastener failure creates costly downtime. The five-bolt pack format is practical for mixed fastening jobs, prototype builds, or replacement stock on job sites and in mobile toolkits. Stocking versatile sizes like the 5/16-18 x 1-1/2 eliminates the need for custom orders when standard-sized holes require reliable, zinc-plated alternatives fail due to corrosion or torque-out risk.

For buyers familiar with fastener specifications, Grade 5 bolts represent a proven middle ground between entry-level hardware and premium Grade 8 fasteners. The socket head style is favored in precision assembly work where flush mounting or clean aesthetics matter, and the black oxide coating resists rust better than bare steel in salt-air, moisture-heavy, or temperature-cycled conditions typical of coastal, marine, or outdoor equipment use.