3 /8″-16UNC (外徑= 3/8″ ,16UNC = 美國粗牙每英寸16牙) 3/8″ = 25.4 * 3 / 8 = 9.525mm. 16UNC牙距= 25.4 / 16 = 1.5875mm. 鑽孔尺寸= 9.525mm – 1.5875mm = 7.9375mm.
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