Item Specifications UPC 842176136790 Package Quantity 100 Size 1/4"-28 x 1/2" Head Style Flat Counter Sink Angle 82 Degree Head Diameter 0.531" Head Height 0.161" Drive Style Allen Hex Key Drive Size 5/32" Inch / Metric Inch Thread Size 1/4"-28 Thread Dia. 0.250" Thread Class Class 3A Coarse / Fine Fine Threads Per Inch (TPI) 28 Thread Coverage Full Thread Length 1/2" Thread Length Dec. 0.339" 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 5150-10350 SKU 211123