以1/4-20UNC 之螺絲攻進行攻牙時，則攻螺紋鑽頭之直徑約為多少？(A) 5mm (B) 5mm (C) 7mm (D) 5mm-58題庫

7. 以1/4-20UNC 之螺絲攻進行攻牙時，則攻螺紋鑽頭之直徑約為多少？
(A) 5mm
(B) 6.5mm
(C) 7mm
(D) 7.5mm

參考答案

無參考答案

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