DIN 7990-2008《钢结构用带六角螺母的六角头螺栓》
This standard specifies dimensions and technical delivery conditions for M12 to M30 hexagon head bolts of
product grade C for use in structural steel bolting. It also specifies the nuts and washers to be used. Additional
requirements as defined in Annex A may be agreed.
Hexagon head bolts complying with this standard are also suitable for use in aluminium structures and in
composite construction.