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鋼管外徑 Sch.5S Sch.10S Sch.10 Sch.20 Sch.30 STD Sch.40S Sch.40 Sch.60 XS Sch.80S Sch.80 Sch.100 Sch.120 Sch.140 Sch.160 XXS 1/2 15 21.3 18 17 15.5 15.5 15.5 14 14 14 12 7 3/4 20 26.9 23.5 22.5 21 21 21 18.5 18.5 18.5 15.5 10.5 1 25 33.7 30.5 27.5 27 27 27 24.5 24.5 24.5 21 16 1 1/4 32 42.4 39 36.5 35 35 35 32 32 32 29.5 22 1 1/2 40 48.3 45 42.5 41 41 41 38 38 38 34 28 2 50 60.3 57 54.5 53.5 52 52 52