Home / Standards / GB 9074.12-88 GB 9074.12-88 Cross-recessed hexagon bolts with indentation and spring washer assemblies 十字槽凹穴六角头螺栓和弹簧垫圈组合件 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A