coarse screw tap
... screw stock tap wrench 丝锥扳手 coarse screw tap 粗丝锥 ; 粗螺丝攻 screw-down tap 螺旋式水龙头 ...
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粗牙丝锥 coarse thread tap
粗螺纹丝锥 coarse thread tap
粗加工丝锥 first tap
粗切丝锥 rougher tap
·2,447,543篇论文数据，部分数据来源于NoteExpress
成套丝锥由一支或者更多在用精加工丝锥最终加工到尺寸之前移除大多数材料的较小尺寸的粗切丝锥组成。
Serial taps comprise of one or more undersized roughing taps which remove most ot the material before final sizing with a finishing tap.
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