Item Specifications UPC 842176166575 Package Quantity 10 Size 5/16"-18 x 5/16" Head Style Socket Cap Head Diameter 15/32" Head Height 0.3125" Drive Style Allen Hex Key Drive Size 1/4" Inch / Metric Inch Thread Size 5/16"-18 Thread Dia. 0.3125" Thread Class Class 3A Coarse / Fine Coarse Threads Per Inch (TPI) 18 Thread Coverage Full Thread Length 5/16" Thread Length Dec. 0.313" Material Stainless Steel 18-8 Finish Plain Tensile Strength 70,000 PSI Core Hardness Rockwell B70 Item Type Socket Screws Product Code 5150-26245 SKU 4068135