螺絲規格 定義與認識 ... 3﹒英制螺絲. 1/8"-40T (外徑 = 1/8" = 3.175mm ,每英寸40牙= 25.4 / 16 = 0.635mm) ,鑽孔尺寸 = 3.175mm - 0.635mm = 2.54 ...
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