Threads Threads are specified by giving the nominal diameter and threads per inch. ANSI:%-13UNC;%-13UNF ■Metric:M8x1.25 Shanghai Jiao Tong University 9Shanghai Jiao Tong University 9 Threads n Threads are specified by giving the nominal diameter and threads per inch. n ANSI: ½-13UNC; ½-13UNF n Metric: M8x1.25