... hex head wood screws 5/16*2-1/2 (+3 Cr black) 1.standard:ANSI 2.material:35ACr 3.grade:5 4.finishing:+3 Cr ... ,black zinc ANSI hex head wood screws 5/16*2-1/2 (+3 Cr black)1.Metail:Carbon steel,stainless ... steel,35CrMo,35#.etc.2.Size:1/4-1''3.Standards:DIN ,ANSI/ASME ... :plain,zinc plated,black oxide,hot dip galv.etc.5.Packing:in bulk,15-25kgs per carton,then on ...