Nominal Pipe Size (NB) INCHES	Diameter Nominal(DN) MM	Outer Diameter (OD) MM
1/8	6	10.3
1/4	8	13.7
3/8	10	17.1
1/2	15	21.3
3/4	20	26.7
1	25	33.4
1 1/4	32	42.2
1 1/2	40	48.3
2	50	60.3
2 1/2	65	73
3	80	88.9
3 1/2	90	101.6
4	100	114.3
5	125	141.3
6	150	168.3
8	200	219.1
10	250	273.1
12	300	323.9
14	350	355.6
16	400	406.4
18	450	457.2
20	500	508
24	600	609.6
30	750	762
36	900	914.4