Diversitech Cap Screw, Measurement System: Imperial, 5/16-18, 1-1/2 in Length Under Head, #2 Grade, Carbon Steel, Head Hex, 7/8 in Minimum Thread Length
Hex Screw Cap Screws are made of low carbon, grade 2 steel and are USS Classified. The total thread length on these screws equal 2x diameter + 1/4 in.