round head bolt

直角三角形_馆档网 ... "圆头"," round head" "圆头螺栓"," round head bolt" "圆头铆钉"," round head rivet" ...

管子(按照配管标准规格制造的) - 豆丁网 ... 形螺栓 T-bolt 圆头螺钉 round head bolt 机螺栓，机螺钉 maehine bolt ...