Nominal Imperial Pipe Size Metric (NB) C/L of Pipe Width Hole Centres Material Fixing Holes
1 / 2″ 15 49 60 12 x 25 Slot 30 x 5 12
3 / 4″ 20 52 60 12 x 25 Slot 30 x 5 12
1″ 25 55 60 12 x 25 Slot 30 x 5 12
11 / 4″ 32 59 60 12 x 25 Slot 30 x 5 12
11 / 2″ 40 62 60 12 x 25 Slot 30 x 5 12
2″ 50 68 60 12 x 25 Slot 30 x 5 12
21 /2″ 65 76 80 12 x 25 Slot 30 x 5 12
3″ 80 111 112 50 40 x 5 12
4″ 100 123 112 50 40 x 5 12
5″ 125 150 170 70 50 x 6 14
6″ 150 164 170 70 50 x 6 14
8″ 200 200 256 115 50 x 8 19
10″ 250 245 312 127 50 x 10 19
12″ 300 300 362 152 50 x 10 19