Item Specifications UPC 842176136424 Package Quantity 25 Size 5/16"-24 x 5/8" Head Style Flat Counter Sink Angle 82 Degree Head Diameter 0.656" Head Height 0.198" Drive Style Allen Hex Key Drive Size 3/16" Inch / Metric Inch Thread Size 5/16"-24 Thread Dia. 0.3125" Thread Class Class 3A Coarse / Fine Fine Threads Per Inch (TPI) 24 Thread Coverage Full Thread Length 5/8" Thread Length Dec. 0.427" Material Alloy Steel Grade Grade 8 Finish Black Oxide Specification 1 ASME : B18.3 Tensile Strength 120,000 PSI Core Hardness Rockwell C32 Item Type Socket Screws Product Code 5150-10535 SKU 211179