Specification to BS 4504
DN | PN 10 Flange | PN 16 Flange | PN 25 Flange | PN 40 Flange | ||||||||||||
Bolt Holes | Size | x | Length | Bolt Holes | Size | x | Length | Bolt Holes | Size | x | Length | Bolt Holes | Size | x | Length | |
50 | 4 | M16 | x | 65 | 4 | M16 | x | 65 | 4 | M16 | x | 65 | 4 | M16 | x | 65 |
80 | 8 | M16 | x | 65 | 8 | M16 | x | 65 | 8 | M16 | x | 65 | 8 | M16 | x | 65 |
100 | 8 | M16 | x | 65 | 8 | M16 | x | 65 | 8 | M20 | x | 70 | 8 | M20 | x | 70 |
150 | 8 | M20 | x | 70 | 8 | M20 | x | 70 | 8 | M24 | x | 85 | 8 | M24 | x | 85 |
200 | 8 | M20 | x | 70 | 12 | M20 | x | 70 | 12 | M24 | x | 85 | 12 | M27 | x | 100 |
250 | 12 | M20 | x | 80 | 12 | M24 | x | 85 | 12 | M27 | x | 100 | 12 | M30 | x | 110 |
300 | 12 | M20 | x | 80 | 12 | M24 | x | 85 | 16 | M27 | x | 100 | 16 | M30 | x | 120 |
350 | 16 | M20 | x | 80 | 16 | M24 | x | 85 | 16 | M30 | x | 110 | 16 | M33 | x | 140 |
400 | 16 | M24 | x | 85 | 16 | M27 | x | 100 | 16 | M33 | x | 120 | 16 | M36 | x | 150 |
450 | 20 | M24 | x | 85 | 20 | M27 | x | 100 | 20 | M33 | x | 120 | 20 | M36 | x | 150 |
500 | 20 | M24 | x | 90 | 20 | M30 | x | 110 | 20 | M33 | x | 120 | 20 | M39 | x | 160 |
600 | 20 | M27 | x | 100 | 20 | M33 | x | 120 | 20 | M36 | x | 140 | 20 | M45 | x | 180 |
700 | 24 | M27 | x | 110 | 24 | M33 | x | 130 | 24 | M39 | x | 150 | – | – | – | – |
800 | 24 | M30 | x | 110 | 24 | M36 | x | 140 | 24 | M45 | x | 160 | – | – | – | – |
900 | 28 | M30 | x | 120 | 28 | M36 | x | 140 | 28 | M45 | x | 180 | – | – | – | – |
1000 | 28 | M33 | x | 130 | 28 | M39 | x | 160 | 28 | M52 | x | 200 | – | – | – | – |
1100 | 32 | M33 | x | 130 | 32 | M39 | x | 160 | 32 | M52 | x | 200 | – | – | – | – |
1200 | 32 | M36 | x | 140 | 32 | M45 | x | 180 | 32 | M52 | x | 200 | – | – | – | – |
1400 | 36 | M39 | x | 150 | 36 | M45 | x | 180 | 36 | M56 | x | 220 | – | – | – | – |
1600 | 40 | M45 | x | 160 | 40 | M52 | x | 200 | 40 | M56 | x | 240 | – | – | – | – |