HG/T20634A453Gr660六角螺母

ASME B18.2.4.6M美标六角头螺母

ASME B 18.2.3.5M美标六角头螺栓

DIN912P1-90内六角螺钉

UNI5909双头螺柱意标螺丝

GB953C级等长双头螺柱

GB900双头螺柱不等长螺柱

GB899双头螺柱国标螺柱

GB898双头螺柱国标螺柱

DIN835德标双头螺柱

DIN940双头螺柱

JISB 1173日标双头螺柱