1 parmak, 2,54 santimetreye (cm) ve 1 inç'e (in) eşittir. Bu ölçü, İngiliz ölçü birimi olan inç'in yurtiçinde parmak olarak adlandırılmasıyla ortaya çıkmıştır.
1 parmak boru ölçüsü, 1 inç (in) olarak ifade edilir ve bu da 25,4 mm'ye eşittir. Ayrıca, DN (Nominal Diameter) cinsinden ifade edildiğinde, 1 parmak boru DN 25 olarak adlandırılır.
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