external threading
... taper turning锥度车削 external threading外螺纹车削 chuck handle夹头扳手，夹头钥匙 ...
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该刀结构简单，可进行车削内外螺纹、内外沟槽、镗孔、外圆等多种加工。
The lathe tool with simple structure can carry out multiple processing of turning the inner and the outer thread, the inner and the outer groove, the boring and the outer circle.
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