flat-head bolt 平头螺栓
flat head anchor bolt 平头固定螺栓
flat slotted head bolt 平槽头螺栓
flat envelope head grooved bolt 平头槽螺栓
flat-head anchor bolt 平头地脚螺栓
flat envelope head bolt 平帽螺栓
slotted flat mushroom-head fit bolt 有槽平顶菌头配合螺栓
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flush bolt
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