螺絲攻牙鉆牙孔徑對照表_word文檔在線閱讀與下載_ ... Thread,有管用斜行牙絲攻pt(rc)及直行牙ps(rp),NPSF,另外尚有美式管用螺紋絲攻npt, Unified Fine Thread,有 ...
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