British Standard Pipe Dimensions: Metric to imperial size comparison

 

Nominal Bore (metric) Nominal Bore (Imperial) Pipe Outside Diamter (metric)
10 mm 3/8 " 17.2 mm
15 mm 1/2 " 21.3 mm
20 mm 3/4 " 26.9 mm
25 mm 1 " 33.7 mm
32 mm 1.25 " 42.4 mm
40 mm 1.5 " 48.3 mm
50 mm 2 " 60.3 mm
65 mm 2.5 " 76.1 mm
80 mm 3 " 88.9 mm
100 4 " 114.3 mm
125 5 " 139.7 mm
150 6" 168.3 mm
175 7" 193.7 mm
200 8" 219.1 mm
225 9" 244.5 mm
250 10" 273 mm
300 12" 323.9 mm
350 14" 355.6 mm
400 16" 406.4 mm
450 18" 457.0 mm
500 20"  508.0mm
550 22" 559.0 mm
600 24" 610.0 mm
650 26" 660.0 mm
700 28" 711.0 mm
750 30" 762.0 mm
800 32" 813.0 mm

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