BOLTING STANDARDS

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Specification to BS 4504

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In the factory

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 – – – –