英制的幾分就是將一英寸分成8份一分就是1/8" 二分就是2/8" = 1/4" 三分... 所以3分= 3/8" = 3/8 x 25.4 = 9.525mm ... 3/4”=0.75即俗稱的六分因6/8”約分後得3/4”.
確定! 回上一頁