sharp v thread

... round sharp needle [医]员利针,圆利针 sharp V thread 锐角螺纹,非截顶三角螺纹 sharp and quick hearing [医]耳听聪敏 ...

4.V 形螺纹(Sharp V Thread)： 顶部与根部均成尖状，强度较弱，亦坏不常使用。螺纹角为 60 度。

美英加陆军规格_馆档网 ... "细铅笔线"," sharp pencil line" "尖V形螺纹"," sharp V thread" "削铅笔机"," sharpening machine" ...