牙規. 1/8″ (1分), 1/4″ (2分), 3/8″ (3分), 1/2″ (4分), 3/4″ (6分), 1″ (8分), 1-1/4″, 1-1/2″, 2″. 外徑(mm), NPT, 9.489, 12.487, 15.926, 19.772 ...
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