Home / Standards / GBT 9074.20-2004 GBT 9074.20-2004 Cross recessed hexagon head tapping screws with indentation and plain washers — Assemblies 十字槽凹穴六角头自攻螺钉和平垫圈组合件 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A