collar head screw 带缘螺钉 ; 有领螺钉
square collar-head set-bolt 方头凸缘端紧定螺栓
collar-head screw [机] 环头螺钉
Square head with collar 带凸缘的方头
Triangle head with collar 带凸缘的三角头
Hexagon head with collar 六角头 ; 六角头凸缘
collar-head bolt 环头螺栓
N the part of a bridle that fits round a horse's head 马头套 (Also called (esp US) headstall)
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