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British Standard Pipe Dimensions: Metric to imperial size comparison

 

Nominal Bore (metric)Nominal Bore (Imperial)Pipe Outside Diamter (metric)
10 mm3/8 "17.2 mm
15 mm1/2 "21.3 mm
20 mm3/4 "26.9 mm
25 mm1 "33.7 mm
32 mm1.25 "42.4 mm
40 mm1.5 "48.3 mm
50 mm2 "60.3 mm
65 mm2.5 "76.1 mm
80 mm3 "88.9 mm
1004 "114.3 mm
1255 "139.7 mm
1506"168.3 mm
1757"193.7 mm
2008"219.1 mm
2259"244.5 mm
25010"273 mm
30012"323.9 mm
35014"355.6 mm
40016"406.4 mm
45018"457.0 mm
50020" 508.0mm
55022"559.0 mm
60024"610.0 mm
65026"660.0 mm
70028"711.0 mm
75030"762.0 mm
80032"813.0 mm