a bit for enlarging the upper part of a hole 同义词：counterbore, countersink bit,
a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface
insert (a nail or screw below the surface, as into a countersink) 同义词：set,
A countersink is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common usage is to allow the head of a countersunk bolt or screw, when placed in the hole, to sit flush with or below the surface of the surrounding material.
例句与用法
1.
" countersunk head nib bolts " ploughshare " type 商业性通用螺栓制造.埋头尖螺栓
2.
Countersunk head rivets ; nominal diameters 10 to 36 mm 沉头铆钉.公称直径10至36mm
3.
Detachable pilots for counterbores and countersinks 扩孔钻和沉头钻用可拆卸导杆
4.
Countersunk head screws - head configuration and gauging 埋头螺钉.头部外形和测量
5.
Slotted raised countersunk head screws with waisted shank 开槽半沉头不脱出螺钉
6.
Cross recessed countersunk head wood screws . symbol fz 十字槽沉头木螺钉.符号fz
7.
90 countersinks with pilots - technical requirements 带导柱90锥面锪钻技术条件
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