Nominal Imperial Pipe Size Metric (NB) C/L of Pipe Lug Centres Material A (mm)
1/2″ 15 41 95 30 x 3
3/4″ 20 44 95 30 x 3
1″ 25 47 95 30 x 3
11 / 4″ 32 55 105 30 x 3
11 / 2″ 40 58 105 30 x 3
2″ 50 72 116 30 x 3
21 / 2″ 65 80 140 30 x 3
3″ 80 87 180 40 x 3
4″ 100 99 180 40 x 3
5″ 125 130 230 50 x 3
6″ 150 144 230 50 x 3
8″ 200 200 380 50 x 3
10″ 250 250 430 50 x 3
12″ 300 289 490 50 x 3