5/16-18 x 1in SS Bolts Pair

The Billet Specialties 5/16-18 x 1in Stainless Steel Bolts Pair (Part 66115) delivers precision fastening for custom automotive builds and mechanical assemblies where corrosion resistance and clean aesthetics matter. These allen head bolts ship as a matched pair with integrated washers, designed for applications requiring secure, repeatable clamping without sacrificing appearance or durability.

The 5/16-18 metric specification denotes a 5/16-inch diameter shaft with 18 threads per inch, producing a fine pitch that distributes load gradually and reduces vibration loosening under engine compartment or suspension stress. The 1-inch length positions these bolts for shallow counterbore or direct-face mounting, while the 1-inch washer spreads clamping pressure across a wider bearing surface. Stainless steel construction resists oxidation and corrosion in high-moisture or salt-air environments, eliminating the rust bloom typical of plain steel fasteners. The allen head (hex socket) design permits socket wrench application without external tools, streamlining installation and removal cycles on multi-fastener assemblies.

Billet Specialties bolts are favored by builders and fabricators performing fender, bumper, and body panel installations where fastener visibility and surface finish are critical. The natural (unplated) stainless finish maintains the clean, seamless look of polished or brushed components without chrome or zinc coating thickness variations. This pair covers a single two-bolt application or serves as spares for inventory rotation on multi-vehicle shops and restoration programs.

For buyers sourcing OEM-quality replacement fasteners or building custom assemblies, stainless steel bolts eliminate future corrosion concerns and deliver a professional finish without ongoing maintenance. The fine pitch thread and integrated washer reduce assembly time and fastener count on tight layouts.