5/16-18 x 13 1/2 Alloy Steel Socket Head Cap Screw belongs to the long-length lane of our alloy socket cap program. The cylindrical head and internal drive suit recessed installations where clearance around the head is tight. Alloy steel construction gives the high tensile strength expected of socket head cap screws, appropriate for clamping structural and machine joints. This size has shipped from our floor before and is listed so the next buyer can find it without a search party. Pricing is quoted per 100 pieces; contact us for current pricing and availability on this size. Related lengths of the same thread are listed alongside this size, and special versions can be quoted. Distributors and OEM purchasing teams can reference this exact size for repeat orders. Orders are packaged and labeled for industrial stockroom use. The size is listed exactly as dimensioned so search and drawing callouts match one to one. Orders are packaged and labeled for industrial stockroom use. The size is listed exactly as dimensioned so search and drawing callouts match one to one. Technical Highlights Material: Alloy Steel Thread: 5/16-18 Length: 13 1/2 in. Nominal Body Diameter: .312 in. Head Diameter: 0.457 Head Height: 0.306 Drive Type: Internal hex socket Finish: Plain (black)