hexagon bolt with collar
... square collar-head bolt 方头凸缘螺栓 hexagon bolt with collar 六角头凸缘螺栓 square collar-head set-bolt 方头凸缘端紧定螺栓 ...
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六角凸缘头螺栓 SCREW,HEX FLANGE HEAD CAP ; SCREW,HEXAGON HEAD CAP
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