square-head set-bolt

... 支撑螺栓stay botl 方头紧定螺栓square-head set-bolt 方头凸缘端紧定螺栓square collar-head set-bolt ...

 bolt

... 小方头螺栓 B级 Product grade 方头凸缘螺栓 square collarhead bolt ; head bolt 方头紧定螺栓 squarehead setbolt ; bolt ...