| 单词 | countersink bit |
| 释义 | > as lemmascountersink bit 2. The conical enlargement of the upper part of a hole for receiving the head of a screw or bolt. Cf. countersunk adj. Hence countersink bit, a bit for cutting a countersink. ΘΚΠ the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging > an enlargement countersunk1794 countersink1846 counterborea1884 1846 J. E. Worcester Universal Dict. Eng. Lang. (citing Tanner). 1869 E. J. Reed Shipbuilding xvii. 330 The shank is conically shaped under the head in order to fit the countersink. 1879 Cassell's Techn. Educator (new ed.) IV. 135/2 Punching..has..the advantage of giving a slight countersink, or conical form to the hole. < as lemmas |
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