bolt_screw_nut

• 子母钉/对锁螺丝螺母Sex bolt/sex nut/Binding Barrels (with screws)

• Round coupling nut/round connector nut

• 双头螺栓/Stud

• 一头公一头母的延长螺柱：standsoffs

• M5螺栓细螺纹为0.5mm，粗螺纹为0.8mm，常用为粗螺纹