1/2" NB (DN15) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||
| BS EN 1092 | ||||||||||||
| PN 6 | 80 | 55 | 4 | M10 | 11 | 38 | 40 | 2 | 12 (1) | – | 12 | – |
| PN 10 | 95 | 65 | 4 | M12 | 14 | 46 | 45 | 2 | 14 (1) | – | 16 | 14 |
| PN 16 | 95 | 65 | 4 | M12 | 14 | 46 | 45 | 2 | 14 (1) | 6 (2) | 16 | 14 |
| PN 25 | 95 | 65 | 4 | M12 | 14 | 46 | 45 | 2 | 16 (1) | 8 (2) | 16 | 14 |
| PN 40 | 95 | 65 | 4 | M12 | 14 | 46 | 45 | 2 | – | 9 (2) | 16 | 16 |
| PN 64 | 105 | 75 | 4 | M12 | 14 | – | 45 | 2 | – | – | 20 | – |
| ANSI | ||||||||||||
| Class 125/150 | 3 1/2" (89) | 2 3/8" (60) | 4 | 1/2" (13) | 5/8" (16) | – | 1 3/8" (35) | 1/16" (2) | – | 5/16" (8) | 7/16" (11) | – |
| Class 300 | 3 3/4" (95) | 2 5/8" (67) | 4 | 1/2" (13) | 5/8" (16) | – | 1 3/8" (35) | 1/16" (2) | – | 1/2" (13) | 1/2" (13) | – |
| Class 600 | 3 3/4" (95) | 2 5/8" (67) | 4 | 1/2" (13) | 5/8" (16) | – | 1 3/8" (35) | 1/4" (6) | – | – | 9/16" (14) | – |
| Class 900 | 4 3/4" (121) | 3 1/4" (83) | 4 | 3/4" (19) | 7/8" (22) | – | 1 3/8" (35) | 1/4" (6) | – | – | 7/8" (22) | – |
| Class 1500 | 4 3/4" (121) | 3 1/4" (83) | 4 | 3/4" (19) | 7/8" (22) | – | 1 3/8" (35) | 1/4" (6) | – | – | 7/8" (22) | – |
| BS 10 | ||||||||||||
| Table A | 3 3/4" (95) | 2 5/8" (67) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 1/4" (6) | – | – |
| Table D | 3 3/4" (95) | 2 5/8" (67) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 1/4" (6) | 3/8" (10) | – |
| Table E | 3 3/4" (95) | 2 5/8" (67) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 1/4" (6) | 3/8" (10) | – |
| Table F | 3 3/4" (95) | 2 5/8" (67) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 5/16" (8) | 3/8" (10) | – |
| Table H | 4 1/2" (114) | 3 1/4" (83) | 4 | 5/8" (16) | 11/16" (17) | – | 2 1/4" (57) | 1/16" (2) | 5/8" (16) | 3/8" (10) | 1/2" (13) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
3/4" NB (DN20) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||
| BS EN 1092 | ||||||||||||
| PN 6 | 90 | 65 | 4 | M10 | 11 | 48 | 50 | 2 | 14 (1) | – | 14 | – |
| PN 10 | 105 | 75 | 4 | M12 | 14 | 56 | 58 | 2 | 16 (1) | – | 18 | 16 |
| PN 16 | 105 | 75 | 4 | M12 | 14 | 56 | 58 | 2 | 16 (1) | 6 (2) | 18 | 16 |
| PN 25 | 105 | 75 | 4 | M12 | 14 | 56 | 58 | 2 | 18 (1) | 8 (2) | 18 | 16 |
| PN 40 | 105 | 75 | 4 | M12 | 14 | 56 | 58 | 2 | – | 9 (2) | 18 | 18 |
| PN 64 | 130 | 90 | 4 | M16 | 18 | – | 58 | 2 | – | – | 22 | – |
| PN 100 | 130 | 90 | 4 | M16 | 18 | – | 58 | 2 | – | – | 22 | – |
| ANSI | ||||||||||||
| Class 125/150 | 3 7/8" (98) | 2 3/4" (70) | 4 | 1/2" (13) | 5/8" (16) | – | 1 11/16" (43) | 1/16" (2) | – | 11/32" (9) | 9/16" (14) | – |
| Class 300 | 4 5/8" (117) | 3 1/4" (83) | 4 | 5/8" (16) | 3/4" (19) | – | 1 11/16" (43) | 1/16" (2) | – | 17/32" (13) | 5/8" (16) | – |
| Class 600 | 4 5/8" (117) | 3 1/4" (83) | 4 | 5/8" (16) | 3/4" (19) | – | 1 11/16" (43) | 1/4" (6) | – | – | 5/8" (16) | – |
| Class 900 | 5 1/8" (130) | 3 1/2" (89) | 4 | 3/4" (19) | 7/8" (22) | – | 1 11/16" (43) | 1/4" (6) | – | – | 1" (25) | – |
| Class 1500 | 5 1/8" (130) | 3 1/2" (89) | 4 | 3/4" (19) | 7/8" (22) | – | 1 11/16" (43) | 1/4" (6) | – | – | 1" (25) | – |
| BS 10 | ||||||||||||
| Table A | 4" (102) | 2 7/8" (73) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 1/4" (6) | – | – |
| Table D | 4" (102) | 2 7/8" (73) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 1/4" (6) | 3/8" (10) | – |
| Table E | 4" (102) | 2 7/8" (73) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 1/4" (6) | 3/8" (10) | – |
| Table F | 4" (102) | 2 7/8" (73) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | 1/2" (13) | 5/16" (8) | 3/8" (10) | – |
| Table H | 4 1/2" (114) | 3 1/4" (83) | 4 | 5/8" (16) | 11/16" (17) | – | 2 1/4" (57) | 1/16" (2) | 5/8" (16) | 3/8" (10) | 1/2" (13) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
1" NB (DN25) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
||||||||||
| BS EN 1092 | |||||||||||||
| PN 6 | 100 | 75 | 4 | M10 | 11 | 58 | 60 | 3 | 2 | 14 (1) | – | 14 | – |
| PN 10 | 115 | 85 | 4 | M12 | 14 | 65 | 68 | 3 | 2 | 16 (1) | – | 18 | 16 |
| PN 16 | 115 | 85 | 4 | M12 | 14 | 65 | 68 | 3 | 2 | 16 (1) | 8 (2) | 18 | 16 |
| PN 25 | 115 | 85 | 4 | M12 | 14 | 65 | 68 | 3 | 2 | 18 (1) | 9 (2) | 18 | 16 |
| PN 40 | 115 | 85 | 4 | M12 | 14 | 65 | 68 | 3 | 2 | – | 11 (2) | 18 | 18 |
| PN 64 | 140 | 100 | 4 | M16 | 18 | – | 68 | – | 2 | – | – | 24 | – |
| PN 100 | 140 | 100 | 4 | M16 | 18 | – | 68 | – | 2 | – | – | 24 | – |
| ANSI | |||||||||||||
| Class 125/150 | 4 1/4" (108) | 3 1/8" (79) | 4 | 1/2" (13) | 5/8" (16) | – | 2" (51) | – | 1/16" (2) | 7/16" (11) | 3/8" (10) | 7/16" (11) | 9/16" (14) |
| Class 300 | 4 7/8" (124) | 3 1/2" (89) | 4 | 5/8" (16) | 3/4" (19) | – | 2" (51) | – | 1/16" (2) | – | 19/32" (15) | 11/16" (17) | – |
| Class 600 | 4 7/8" (124) | 3 1/2" (89) | 4 | 5/8" (16) | 3/4" (19) | – | 2" (51) | – | 1/4" (6) | – | – | 11/16" (17) | – |
| Class 900 | 5 7/8" (149) | 4" (102) | 4 | 7/8" (22) | 1" (25) | – | 2" (51) | – | 1/4" (6) | – | – | 1 1/8" (29) | – |
| Class 1500 | 5 7/8" (149) | 4" (102) | 4 | 7/8" (22) | 1" (25) | – | 2" (51) | – | 1/4" (6) | – | – | 1 1/8" (29) | – |
| BS 10 | |||||||||||||
| Table A | 4 1/2" (114) | 3 1/4" (83) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | – | 1/2" (13) | 5/16" (8) | – | – |
| Table D | 4 1/2" (114) | 3 1/4" (83) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | – | 1/2" (13) | 5/16" (8) | 3/8" (10) | – |
| Table E | 4 1/2" (114) | 3 1/4" (83) | 4 | 1/2" (13) | 9/16" (14) | – | – | – | – | 1/2" (13) | 5/16" (8) | 3/8" (10) | – |
| Table F | 4 3/4" (121) | 3 7/16" (87) | 4 | 5/8" (16) | 11/16" (17) | – | – | – | – | 1/2" (13) | 3/8" (10) | 3/8" (10) | – |
| Table H | 4 3/4" (121) | 3 7/16" (87) | 4 | 5/8" (16) | 11/16" (17) | – | 2 1/2" (64) | – | 1/16" (2) | 3/4" (19) | 7/16" (11) | 9/16" (14) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
1 1/4" NB (DN32) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 120 | 90 | 4 | M12 | 14 | 14 | 69 | 70 | 3 | 2 | 16 (1) | – | 14 | – |
| PN 10 | 140 | 100 | 4 | M16 | 19 | 18 | 76 | 78 | 3 | 2 | 18 (1) | – | 18 | 18 |
| PN 16 | 140 | 100 | 4 | M16 | 19 | 18 | 76 | 78 | 3 | 2 | 18 (1) | 8 (2) | 18 | 18 |
| PN 25 | 140 | 100 | 4 | M16 | 19 | 18 | 76 | 78 | 3 | 2 | 20 (1) | 9 (2) | 18 | 18 |
| PN 40 | 140 | 100 | 4 | M16 | 19 | 18 | 76 | 78 | 3 | 2 | – | 11 (2) | 18 | 20 |
| PN 64 | 155 | 110 | 4 | M20 | – | 22 | – | 78 | – | 2 | – | – | 26 | – |
| PN 100 | 155 | 110 | 4 | M20 | – | 22 | – | 78 | – | 2 | – | – | 26 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 4 5/8" (117) | 3 1/2" (89) | 4 | 1/2" (13) | 5/8" (16) | 5/8" (16) | – | 2 1/2" (64) | – | 1/16" (2) | 1/2" (13) | 13/32" (10) | 1/2" (13) | 5/8" (16) |
| Class 300 | 5 1/4" (133) | 3 7/8" (98) | 4 | 5/8" (16) | – | 3/4" (19) | – | 2 1/2" (64) | – | 1/16" (2) | – | 5/8" (16) | 3/4" (19) | – |
| Class 600 | 5 1/4" (133) | 3 7/8" (98) | 4 | 5/8" (16) | – | 3/4" (19) | – | 2 1/2" (64) | – | 1/4" (6) | – | – | 13/16" (21) | – |
| Class 900 | 6 1/4" (159) | 4 3/8" (111) | 4 | 7/8" (22) | – | 1" (25) | – | 2 1/2" (64) | – | 1/4" (6) | – | – | 1 1/8" (29) | – |
| Class 1500 | 6 1/4" (159) | 4 3/8" (111) | 4 | 7/8" (22) | – | 1" (25) | – | 2 1/2" (64) | – | 1/4" (6) | – | – | 1 1/8" (29) | – |
| BS 10 | ||||||||||||||
| Table A | 4 3/4" (121) | 3 7/16" (87) | 4 | 1/2" (13) | 9/16" (14) | 9/16" (14) | – | – | – | – | 5/8" (16) | 5/16" (8) | – | – |
| Table D | 4 3/4" (121) | 3 7/16" (87) | 4 | 1/2" (13) | 9/16" (14) | 9/16" (14) | – | – | – | – | 5/8" (16) | 5/16" (8) | 1/2" (13) | – |
| Table E | 4 3/4" (121) | 3 7/16" (87) | 4 | 1/2" (13) | 9/16" (14) | 9/16" (14) | – | – | – | – | 5/8" (16) | 5/16" (8) | 1/2" (13) | – |
| Table F | 5 1/4" (133) | 3 7/8" (98) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 5/8" (16) | 3/8" (10) | 1/2" (13) | – |
| Table H | 5 1/4" (133) | 3 7/8" (98) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | 3" (76) | – | 1/16" (2) | 7/8" (22) | 7/16" (11) | 11/16" (17) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
1 1/2" NB (DN40) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 130 | 100 | 4 | M12 | 14 | 14 | 78 | 80 | 3 | 2 | 16 (1) | – | 14 | – |
| PN 10 | 150 | 110 | 4 | M16 | 19 | 18 | 84 | 88 | 3 | 2 | 18 (1) | – | 18 | 19 |
| PN 16 | 150 | 110 | 4 | M16 | 19 | 18 | 84 | 88 | 3 | 2 | 18 (1) | 9 (2) | 18 | 19 |
| PN 25 | 150 | 110 | 4 | M16 | 19 | 18 | 84 | 88 | 3 | 2 | 20 (1) | 11 (2) | 18 | 19 |
| PN 40 | 150 | 110 | 4 | M16 | 19 | 18 | 84 | 88 | 3 | 2 | – | 13 (2) | 18 | 19 |
| PN 64 | 170 | 125 | 4 | M20 | – | 22 | – | 88 | – | 2 | – | – | 28 | – |
| PN 100 | 170 | 125 | 4 | M20 | – | 22 | – | 88 | – | 2 | – | – | 28 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 5" (127) | 3 7/8" (98) | 4 | 1/2" (13) | 5/8" (16) | 5/8" (16) | – | 2 7/8" (73) | – | 1/16" (2) | 9/16" (14) | 7/16" (11) | 9/16" (14) | 11/16" (17) |
| Class 300 | 6 1/8" (156) | 4 1/2" (114) | 4 | 3/4" (19) | – | 7/8" (22) | – | 2 7/8" (73) | – | 1/16" (2) | – | 11/16" (17) | 13/16" (21) | – |
| Class 600 | 6 1/8" (156) | 4 1/2" (114) | 4 | 3/4" (19) | – | 7/8" (22) | – | 2 7/8" (73) | – | 1/4" (6) | – | – | 7/8" (22) | – |
| Class 900 | 7" (178) | 4 7/8" (124) | 4 | 1" (25) | – | 1 1/8" (29) | – | 2 7/8" (73) | – | 1/4" (6) | – | – | 1 1/4" (32) | – |
| Class 1500 | 7" (178) | 4 7/8" (124) | 4 | 1" (25) | – | 1 1/8" (29) | – | 2 7/8" (73) | – | 1/4" (6) | – | – | 1 1/4" (32) | – |
| BS 10 | ||||||||||||||
| Table A | 5 1/4" (133) | 3 7/8" (98) | 4 | 1/2" (13) | 9/16" (14) | 9/16" (14) | – | – | – | – | 5/8" (16) | 3/8" (10) | – | – |
| Table D | 5 1/4" (133) | 3 7/8" (98) | 4 | 1/2" (13) | 9/16" (14) | 9/16" (14) | – | – | – | – | 5/8" (16) | 3/8" (10) | 1/2" (13) | – |
| Table E | 5 1/4" (133) | 3 7/8" (98) | 4 | 1/2" (13) | 9/16" (14) | 9/16" (14) | – | – | – | – | 5/8" (16) | 3/8" (10) | 1/2" (13) | – |
| Table F | 5 1/2" (140) | 4 1/8" (105) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 5/8" (16) | 7/16" (11) | 1/2" (13) | – |
| Table H | 5 1/2" (140) | 4 1/8" (105) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | 3 1/4" (83) | – | 1/16" (2) | 7/8" (22) | 1/2" (13) | 11/16" (17) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
2" NB (DN50) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 140 | 110 | 4 | M12 | 14 | 14 | 88 | 90 | 3 | 2 | 16 (1) | – | 14 | – |
| PN 10 | 165 | 125 | 4 | M16 | 19 | 18 | 99 | 102 | 3 | 2 | 20 (1) | – | 18 | 19 |
| PN 16 | 165 | 125 | 4 | M16 | 19 | 18 | 99 | 102 | 3 | 2 | 20 (1) | 11 (2) | 18 | 19 |
| PN 25 | 165 | 125 | 4 | M16 | 19 | 18 | 99 | 102 | 3 | 2 | 22 (1) | 11 (2) | 20 | 19 |
| PN 40 | 165 | 125 | 4 | M16 | 19 | 18 | 99 | 102 | 3 | 2 | – | 13 (2) | 20 | 19 |
| PN 64 | 180 | 135 | 4 | M20 | – | 22 | – | 102 | – | 2 | – | – | 26 | – |
| PN 100 | 195 | 145 | 4 | M24 | – | 26 | – | 102 | – | 2 | – | – | 30 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 6" (152) | 4 3/4" (121) | 4 | 5/8" (16) | 3/4" (19) | 3/4" (19) | – | 3 5/8" (92) | – | 1/16" (2) | 5/8" (16) | 1/2" (13) | 5/8" (16) | – |
| Class 300 | 6 1/2" (165) | 5" (127) | 8 | 5/8" (16) | – | 3/4" (19) | – | 3 5/8" (92) | – | 1/16" (2) | – | 3/4" (19) | 7/8" (22) | – |
| Class 600 | 6 1/2" (165) | 5" (127) | 8 | 5/8" (16) | – | 3/4" (19) | – | 3 5/8" (92) | – | 1/4" (6) | – | – | 1" (25) | – |
| Class 900 | 8 1/2" (216) | 6 1/2" (165) | 8 | 7/8" (22) | – | 1" (25) | – | 3 5/8" (92) | – | 1/4" (6) | – | – | 1 1/2" (38) | – |
| Class 1500 | 8 1/2" (216) | 6 1/2" (165) | 8 | 7/8" (22) | – | 1" (25) | – | 3 5/8" (92) | – | 1/4" (6) | – | – | 1 1/2" (38) | – |
| BS 10 | ||||||||||||||
| Table A | 6" (152) | 4 1/2" (114) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 5/8" (16) | 3/8" (10) | – | – |
| Table D | 6" (152) | 4 1/2" (114) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 11/16" (17) | 3/8" (10) | 9/16" (14) | – |
| Table E | 6" (152) | 4 1/2" (114) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 3/8" (10) | 9/16" (14) | – |
| Table F | 6 1/2" (165) | 5" (127) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 7/16" (11) | 5/8" (16) | – |
| Table H | 6 1/2" (165) | 5" (127) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | 4" (102) | – | 1/16" (2) | 1" (25) | 1/2" (13) | 3/4" (19) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
2 1/2" NB (DN65) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 160 | 130 | 4 | M12 | 14 | 14 | 108 | 110 | 2 | 3 | 16 (1) | – | 14 | – |
| PN 10 | 185 | 145 | 4 (4) | M16 | 19 | 18 | 118 | 122 | 2 | 3 | 20 (1) | – | 18 | 19 |
| PN 16 | 185 | 145 | 4 (4) | M16 | 19 | 18 | 118 | 122 | 2 | 3 | 20 (1) | 13 (2) | 18 | 19 |
| PN 25 | 185 | 145 | 8 | M16 | 19 | 18 | 118 | 122 | 2 | 3 | 24 (1) | 13 (2) | 22 | 19 |
| PN 40 | 185 | 145 | 8 | M16 | 19 | 18 | 118 | 122 | 2 | 3 | – | 14 (2) | 22 | 19 |
| PN 64 | 205 | 160 | 8 | M20 | – | 22 | – | 122 | 2 | – | – | – | 26 | – |
| PN 100 | 220 | 170 | 8 | M24 | – | 26 | – | 122 | 2 | – | – | – | 34 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 7" (178) | 5 1/2" (140) | 4 | 5/8" (16) | 3/4" (19) | 3/4" (19) | – | 4 1/8" (105) | – | 1/16" (2) | 11/16" (17) | 9/16" (14) | 11/16" (17) | – |
| Class 300 | 7 1/2" (191) | 5 7/8" (149) | 8 | 3/4" (19) | – | 7/8" (22) | – | 4 1/8" (105) | – | 1/16" (2) | – | 13/16" (21) | 1" (25) | – |
| Class 600 | 7 1/2" (191) | 5 7/8" (149) | 8 | 3/4" (19) | – | 7/8" (22) | – | 4 1/8" (105) | – | 1/4" (6) | – | – | 1 1/8" (29) | – |
| Class 900 | 9 5/8" (244) | 7 1/2" (191) | 8 | 1" (25) | – | 1 1/8" (29) | – | 4 1/8" (105) | – | 1/4" (6) | – | – | 1 5/8" (41) | – |
| Class 1500 | 9 5/8" (244) | 7 1/2" (191) | 8 | 1" (25) | – | 1 1/8" (29) | – | 4 1/8" (105) | – | 1/4" (6) | – | – | 1 5/8" (41) | – |
| BS 10 | ||||||||||||||
| Table A | 6 1/2" (165) | 5" (127) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 11/16" (17) | 7/16" (11) | – | – |
| Table D | 6 1/2" (165) | 5" (127) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 11/16" (17) | 7/16" (11) | 9/16" (14) | – |
| Table E | 6 1/2" (165) | 5" (127) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 7/16" (11) | 9/16" (14) | – |
| Table F | 7 1/4" (184) | 5 3/4" (146) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 1/2" (13) | 5/8" (16) | – |
| Table H | 7 1/4" (184) | 5 3/4" (146) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | 4 1/2" (114) | – | 1/16" (2) | 1" (25) | 9/16" (14) | 3/4" (19) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced. (4) Steel flanges in this DN and PN may be supplied with 8 holes. For compliance with these, equivalent cast iron flanges may be supplied with 8 holes as special order and after agreement between manufacturer and customer.
3" NB (DN80) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 190 | 150 | 4 | M16 | 19 | 18 | 124 | 128 | 3 | 2 | 18 (1) | – | 16 | – |
| PN 10 | 200 | 160 | 8 | M16 | 19 | 18 | 132 | 138 | 3 | 2 | 22 (1) | – | 20 | 19 |
| PN 16 | 200 | 160 | 8 | M16 | 19 | 18 | 132 | 138 | 3 | 2 | 22 (1) | 13 (2) | 20 | 19 |
| PN 25 | 200 | 160 | 8 | M16 | 19 | 18 | 132 | 138 | 3 | 2 | 26 (1) | 14 (2) | 24 | 19 |
| PN 40 | 200 | 160 | 8 | M16 | 19 | 18 | 132 | 138 | 3 | 2 | – | 16 (2) | 24 | 19 |
| PN 64 | 215 | 170 | 8 | M20 | – | 22 | – | 138 | – | 2 | – | – | 28 | – |
| PN 100 | 230 | 180 | 8 | M24 | – | 26 | – | 138 | – | 2 | – | – | 36 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 7 1/2" (191) | 6" (152) | 4 | 5/8" (16) | 3/4" (19) | 3/4" (19) | – | 5" (127) | – | 1/16" (2) | 3/4" (19) | 5/8" (16) | 3/4" (19) | – |
| Class 300 | 8 1/4" (210) | 6 5/8" (168) | 8 | 3/4" (19) | – | 7/8" (22) | – | 5" (127) | – | 1/16" (2) | – | 29/32" (23) | 1 1/8" (29) | – |
| Class 600 | 8 1/4" (210) | 6 5/8" (168) | 8 | 3/4" (19) | – | 7/8" (22) | – | 5" (127) | – | 1/4" (6) | – | – | 1 1/4" (32) | – |
| Class 900 | 9 1/2" (241) | 7 1/2" (192) | 8 | 7/8" (22) | – | 1" (25) | – | 5" (127) | – | 1/4" (6) | – | – | 1 1/2" (38) | – |
| Class 1500 | 10 1/2" (267) | 8" (203) | 8 | 1 1/8" (29) | – | 1 1/4" (32) | – | 5" (127) | – | 1/4" (6) | – | – | 1 7/8" (48) | – |
| BS 10 | ||||||||||||||
| Table A | 7 1/4" (184) | 5 3/4" (146) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 11/16" (17) | 1/2" (13) | – | – |
| Table D | 7 1/4" (184) | 5 3/4" (146) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 1/2" (13) | 9/16" (14) | – |
| Table E | 7 1/4" (184) | 5 3/4" (146) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 1/2" (13) | 9/16" (14) | – |
| Table F | 8" (203) | 6 1/2" (165) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 9/16" (14) | 5/8" (16) | – |
| Table H | 8" (203) | 6 1/2" (165) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | 5" (127) | – | 1/16" (2) | 1 1/8" (29) | 5/8" (16) | 7/8" (22) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
4" NB (DN100) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 210 | 170 | 4 | M16 | 19 | 18 | 144 | 148 | 3 | 2 | 18 (1) | – | 16 | – |
| PN 10 | 220 | 180 | 8 | M16 | 19 | 18 | 156 | 158 | 3 | 2 | 24 (1) | – | 20 | 19 |
| PN 16 | 220 | 180 | 8 | M16 | 19 | 18 | 156 | 158 | 3 | 2 | 24 (1) | 16 (2) | 20 | 19 |
| PN 25 | 235 | 190 | 8 | M20 | 23 | 22 | 156 | 162 | 3 | 2 | 28 (1) | 17 (2) | 24 | 19 |
| PN 40 | 235 | 190 | 8 | M20 | 23 | 22 | 156 | 162 | 3 | 2 | – | 19 (2) | 24 | 19 |
| PN 64 | 250 | 200 | 8 | M24 | – | 26 | – | 162 | – | 2 | – | – | 30 | – |
| PN 100 | 265 | 210 | 8 | M27 | – | 30 | – | 162 | – | 2 | – | – | 40 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 9" (229) | 7 1/2" (191) | 8 | 5/8" (16) | 3/4" (19) | 3/4" (19) | – | 6 3/16" (157) | – | 1/16" (2) | 15/16" (24) | 11/16" (17) | 15/16" (24) | – |
| Class 300 | 10" (254) | 7 7/8" (200) | 8 | 3/4" (19) | – | 7/8" (22) | – | 6 3/16" (157) | – | 1/16" (2) | – | 1 1/16" (27) | 1 1/4" (32) | – |
| Class 600 | 10 3/4" (273) | 8 1/2" (216) | 8 | 7/8" (22) | – | 1" (25) | – | 6 3/16" (157) | – | 1/4" (6) | – | – | 1 1/2" (38) | – |
| Class 900 | 11 1/2" (292) | 9 1/4" (235) | 8 | 1 1/8" (29) | – | 1 1/4" (32) | – | 6 3/16" (157) | – | 1/4" (6) | – | – | 1 3/4" (44) | – |
| Class 1500 | 12 1/4" (311) | 9 1/2" (241) | 8 | 1 1/4" (32) | – | 1 3/8" (35) | – | 6 3/16" (157) | – | 1/4" (6) | – | – | 2 1/8" (54) | – |
| BS 10 | ||||||||||||||
| Table A | 8 1/2" (216) | 7" (178) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 5/8" (16) | – | – |
| Table D | 8 1/2" (216) | 7" (178) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 5/8" (16) | 11/16" (17) | – |
| Table E | 8 1/2" (216) | 7" (178) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 7/8" (22) | 5/8" (16) | 11/16" (17) | – |
| Table F | 9" (229) | 7 1/2" (191) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 7/8" (22) | 11/16" (17) | 3/4" (19) | – |
| Table H | 9" (229) | 7 1/2" (191) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | 6" (152) | – | 1/16" (2) | 1 1/4" (32) | 3/4" (19) | 1" (25) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Flange thicknesses for copper alloy are from BS4504. (3) Copper alloy flanges are always flat-faced.
5" NB (DN125) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 240 | 200 | 8 | M16 | 19 | 18 | 174 | 178 | 3 | 2 | 20 (1) | – | 18 | – |
| PN 10 | 250 | 210 | 8 | M16 | 19 | 18 | 184 | 188 | 3 | 2 | 26 (1) | – | 22 | 19 |
| PN 16 | 250 | 210 | 8 | M16 | 19 | 18 | 184 | 188 | 3 | 2 | 26 (1) | – | 22 | 19 |
| PN 25 | 270 | 220 | 8 | M24 | 28 | 26 | 184 | 188 | 3 | 2 | 30 (1) | – | 26 | 19 |
| PN 40 | 270 | 220 | 8 | M24 | 28 | 26 | 184 | 188 | 3 | 2 | – | – | 26 | 23.5 |
| PN 64 | 295 | 240 | 8 | M27 | – | 30 | – | 188 | – | 2 | – | – | 34 | – |
| PN 100 | 315 | 250 | 8 | M30 | – | 33 | – | 188 | – | 2 | – | – | 40 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 10" (254) | 8 1/2" (216) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | 7 5/16" (186) | – | 1/16" (2) | 15/16" (24) | 3/4" (19) | 15/16" (24) | – |
| Class 300 | 11" (279) | 9 1/4" (235) | 8 | 3/4" (19) | – | 7/8" (22) | – | 7 5/16" (186) | – | 1/16" (2) | – | 1 1/8" (29) | 1 3/8" (35) | – |
| Class 600 | 13" (330) | 10 1/2" (267) | 8 | 1" (25) | – | 1 1/8" (29) | – | 7 5/16" (186) | – | 1/4" (6) | – | – | 1 3/4" (44) | – |
| Class 900 | 13 3/4" (349) | 11" (279) | 8 | 1 1/4" (32) | – | 1 3/8" (35) | – | 7 5/16" (186) | – | 1/4" (6) | – | – | 2" (51) | – |
| Class 1500 | 14 3/4" (375) | 11 1/2" (292) | 8 | 1 1/2" (38) | – | 1 5/8" (41) | – | 7 5/16" (186) | – | 1/4" (6) | – | – | 2 7/8" (73) | – |
| BS 10 | ||||||||||||||
| Table A | 10" (254) | 8 1/4" (210) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 3/4" (19) | 11/16" (17) | – | – |
| Table D | 10" (254) | 8 1/4" (210) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 13/16" (21) | 11/16" (17) | 11/16" (17) | – |
| Table E | 10" (254) | 8 1/4" (210) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 7/8" (22) | 11/16" (17) | 11/16" (17) | – |
| Table F | 11" (279) | 9 1/4" (235) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1" (25) | 3/4" (19) | 7/8" (22) | – |
| Table H | 11" (279) | 9 1/4" (235) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | 7" (178) | – | 1/16" (2) | 1 3/8" (35) | 7/8" (22) | 1 1/8" (29) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.
6" NB (DN150) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 265 | 225 | 8 | M16 | 19 | 18 | 199 | 202 | 3 | 2 | 20 (1) | – | 18 | – |
| PN 10 | 285 | 240 | 8 | M20 | 23 | 22 | 211 | 212 | 3 | 2 | 26 (1) | – | 22 | 19 |
| PN 16 | 285 | 240 | 8 | M20 | 23 | 22 | 211 | 212 | 3 | 2 | 26 (1) | – | 22 | 19 |
| PN 25 | 300 | 250 | 8 | M24 | 28 | 26 | 211 | 218 | 3 | 2 | 34 (1) | – | 28 | 20 |
| PN 40 | 300 | 250 | 8 | M24 | 28 | 26 | 211 | 218 | 3 | 2 | – | – | 28 | 26 |
| PN 64 | 345 | 280 | 8 | M30 | – | 33 | – | 218 | – | 2 | – | – | 36 | – |
| PN 100 | 355 | 290 | 12 | M30 | – | 33 | – | 218 | – | 2 | – | – | 44 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 11" (279) | 9 1/2" (241) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | 8 1/2" (216) | – | 1/16" (2) | 1" (25) | 13/16" (21) | 1" (25) | – |
| Class 300 | 12 1/2" (318) | 10 5/8" (270) | 12 | 3/4" (19) | – | 7/8" (22) | – | 8 1/2" (216) | – | 1/16" (2) | – | 1 3/16" (30) | 1 7/16" (37) | – |
| Class 600 | 14" (356) | 11 1/2" (292) | 12 | 1" (25) | – | 1 1/8" (29) | – | 8 1/2" (216) | – | 1/4" (6) | – | – | 1 7/8" (48) | – |
| Class 900 | 15" (381) | 12 1/2" (318) | 12 | 1 1/8" (29) | – | 1 1/4" (32) | – | 8 1/2" (216) | – | 1/4" (6) | – | – | 2 3/16" (56) | – |
| Class 1500 | 15 1/2" (394) | 12 1/2" (318) | 12 | 1 3/8" (35) | – | 1 1/2" (38) | – | 8 1/2" (216) | – | 1/4" (6) | – | – | 3 1/4" (83) | – |
| BS 10 | ||||||||||||||
| Table A | 11" (279) | 9 1/4" (235) | 4 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 13/16" (21) | 11/16" (17) | – | – |
| Table D | 11" (279) | 9 1/4" (235) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 13/16" (21) | 11/16" (17) | 11/16" (17) | – |
| Table E | 11" (279) | 9 1/4" (235) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 7/8" (22) | 11/16" (17) | 11/16" (17) | – |
| Table F | 12" (305) | 10 1/4" (260) | 12 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1" (25) | 7/8" (22) | 7/8" (22) | – |
| Table H | 12" (305) | 10 1/4" (260) | 12 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | 8 1/4" (210) | – | 1/16" (2) | 1 3/8" (35) | 1" (25) | 1 1/8" (29) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.
8" NB (DN200) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 320 | 280 | 8 | M16 | 19 | 18 | 254 | 258 | 3 | 2 | 22 (1) | – | 20 | – |
| PN 10 | 340 | 295 | 8 | M20 | 23 | 22 | 266 | 268 | 3 | 2 | 26 (1) | – | 24 | 20 |
| PN 16 | 340 | 295 | 12 | M20 | 23 | 22 | 266 | 268 | 3 | 2 | 30 (1) | – | 24 | 20 |
| PN 25 | 360 | 310 | 12 | M24 | 28 | 26 | 274 | 278 | 3 | 2 | 34 (1) | – | 30 | 22 |
| PN 40 | 375 | 320 | 12 | M27 | 31 | 30 | 284 | 285 | 3 | 2 | – | – | 34 | 30 |
| PN 64 | 415 | 345 | 12 | M33 | – | 36 | – | 285 | – | 2 | – | – | 42 | – |
| PN 100 | 430 | 360 | 12 | M33 | – | 36 | – | 285 | – | 2 | – | – | 52 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 13 1/2" (343) | 11 3/4" (298) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | 10 5/8" (270) | – | 1/16" (2) | 1 1/8" (29) | 15/16" (24) | 1 1/8" (29) | – |
| Class 300 | 15" (381) | 13" (330) | 12 | 7/8" (22) | – | 1" (25) | – | 10 5/8" (270) | – | 1/16" (2) | – | 1 3/8" (35) | 1 5/8" (41) | – |
| Class 600 | 16 1/2" (419) | 13 3/4" (349) | 12 | 1 1/8" (29) | – | 1 1/4" (32) | – | 10 5/8" (270) | – | 1/4" (6) | – | – | 2 3/16" (56) | – |
| Class 900 | 18 1/2" (470) | 15 1/2" (394) | 12 | 1 3/8" (35) | – | 1 1/2" (38) | – | 10 5/8" (270) | – | 1/4" (6) | – | – | 2 1/2" (64) | – |
| Class 1500 | 19" (483) | 15 1/2" (394) | 12 | 1 5/8" (41) | – | 1 3/4" (44) | – | 10 5/8" (270) | – | 1/4" (6) | – | – | 3 5/8" (92) | – |
| BS 10 | ||||||||||||||
| Table A | 13 1/4" (337) | 11 1/2" (292) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 7/8" (22) | 3/4" (19) | 1/2" (13) | – |
| Table D | 13 1/4" (337) | 11 1/2" (292) | 8 | 5/8" (16) | 11/16" (17) | 11/16" (17) | – | – | – | – | 7/8" (22) | 3/4" (19) | 3/4" (19) | – |
| Table E | 13 1/4" (337) | 11 1/2" (292) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1" (25) | 3/4" (19) | 3/4" (19) | – |
| Table F | 14 1/2" (368) | 12 3/4" (324) | 12 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1 1/8" (29) | 1" (25) | 1" (25) | – |
| Table H | 14 1/2" (368) | 12 3/4" (324) | 12 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | 10 1/4" (260) | – | 1/16" (2) | 1 1/2" (38) | 1 1/4" (32) | 1 1/4" (32) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.
10" NB (DN250) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 375 | 335 | 12 | M16 | 19 | 18 | 309 | 312 | 3 | 2 | 24 (1) | – | 22 | – |
| PN 10 | 395 (2) | 350 | 12 | M20 | 23 | 22 | 319 | 320 | 3 | 2 | 28 (1) | – | 26 | 22 |
| PN 16 | 405 (2) | 355 | 12 | M24 | 28 | 26 | 319 | 320 | 3 | 2 | 32 (1) | – | 26 | 22 |
| PN 25 | 425 | 370 | 12 | M27 | 31 | 30 | 330 | 335 | 3 | 2 | – | – | 32 | 24.5 |
| PN 40 | 450 | 385 | 12 | M30 | 34 | 33 | 345 | 345 | 3 | 2 | – | – | 38 | 34.5 |
| PN 64 | 470 | 400 | 12 | M33 | – | 36 | – | 345 | – | 2 | – | – | 46 | – |
| PN 100 | 505 | 430 | 12 | M36 | – | 39 | – | 345 | – | 2 | – | – | 60 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 16" (406) | 14 1/4" (362) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | 12 3/4" (324) | – | 1/16" (2) | 1 3/16" (30) | 1" (25) | 1 3/16" (30) | – |
| Class 300 | 17 1/2" (445) | 15 1/4" (387) | 16 | 1" (25) | – | 1 1/8" (29) | – | 12 3/4" (324) | – | 1/16" (2) | – | – | 1 7/8" (41) | – |
| Class 600 | 20" (508) | 17" (432) | 16 | 1 1/4" (32) | – | 1 3/8" (35) | – | 12 3/4" (324) | – | 1/4" (6) | – | – | 2 1/2" (64) | – |
| Class 900 | 21 1/2" (546) | 18 1/2" (470) | 16 | 1 3/8" (35) | – | 1 1/2" (38) | – | 12 3/4" (324) | – | 1/4" (6) | – | – | 2 3/4" (70) | – |
| Class 1500 | 23" (584) | 19" (483) | 12 | 1 7/8" (41) | – | 2" (51) | – | 12 3/4" (324) | – | 1/4" (6) | – | – | 4 1/4" (108) | – |
| BS 10 | ||||||||||||||
| Table A | 16" (406) | 14" (356) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 15/16" (24) | 3/4" (19) | – | – |
| Table D | 16" (406) | 14" (356) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1" (25) | 3/4" (19) | 3/4" (19) | – |
| Table E | 16" (406) | 14" (356) | 12 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1" (25) | 7/8" (22) | 7/8" (22) | – |
| Table F | 17" (432) | 15" (381) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/8" (29) | 1" (25) | 1" (25) | – |
| Table H | 17" (432) | 15" (381) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | 12 1/4" (311) | – | 1/16" (2) | 1 5/8" (41) | 1 3/8" (35) | 1 3/8" (35) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) For ductile iron pipes and fittings the outside diameters shall be 400mm for PN10 & PN16. (3) Copper alloy flanges are always flat-faced.
12" NB (DN300) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 440 | 395 | 12 | M20 | 23 | 22 | 363 | 365 | 4 | 2 | 24 (1) | – | 22 | – |
| PN 10 | 445 (2) | 400 | 12 | M20 | 23 | 22 | 370 | 370 | 4 | 2 | 28 (1) | – | 26 | 24.5 |
| PN 16 | 460 (2) | 410 | 12 | M24 | 28 | 26 | 370 | 378 | 4 | 2 | 32 (1) | – | 28 | 24.5 |
| PN 25 | 485 | 430 | 16 | M27 | 31 | 30 | 389 | 395 | 4 | 2 | 40 (1) | – | 34 | 27.5 |
| PN 40 | 515 | 450 | 16 | M30 | 34 | 33 | 409 | 410 | 4 | 2 | – | – | 42 | 39.5 |
| PN 64 | 530 | 460 | 16 | M33 | – | 36 | – | 410 | – | 2 | – | – | 52 | – |
| PN 100 | 585 | 500 | 16 | M39 | – | 42 | – | 410 | – | 2 | – | – | 68 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 19" (483) | 17" (432) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | 15" (381) | – | 1/16" (2) | 1 1/4" (32) | 1 1/16" (27) | 1 1/4" (32) | – |
| Class 300 | 20 1/2" (521) | 17 3/4" (451) | 16 | 1 1/8" (29) | – | 1 1/4" (32) | – | 15" (381) | – | 1/16" (2) | – | – | 2" (51) | – |
| Class 600 | 22" (559) | 19 1/4" (489) | 20 | 1 1/4" (32) | – | 1 3/8" (35) | – | 15" (381) | – | 1/4" (6) | – | – | 2 5/8" (67) | – |
| Class 900 | 24" (610) | 21" (533) | 20 | 1 3/8" (35) | – | 1 1/2" (38) | – | 15" (381) | – | 1/4" (6) | – | – | 3 1/8" (80) | – |
| Class 1500 | 26 1/2" (673) | 22 1/2" (571) | 16 | 2" (51) | – | 2 1/8" (54) | – | 15" (381) | – | 1/4" (6) | – | – | 4 7/8" (124) | – |
| BS 10 | ||||||||||||||
| Table A | 18" (457) | 16" (406) | 8 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 15/16" (24) | 7/8" (22) | – | – |
| Table D | 18" (457) | 16" (406) | 12 | 3/4" (19) | 7/8" (22) | 7/8" (22) | – | – | – | – | 1" (25) | 7/8" (22) | 7/8" (22) | – |
| Table E | 18" (457) | 16" (406) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/8" (29) | 1" (25) | 1" (25) | – |
| Table F | 19 1/4" (489) | 17 1/4" (438) | 16 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/4" (32) | 1 1/8" (29) | 1 1/8" (29) | – |
| Table H | 19 1/4" (489) | 17 1/4" (438) | 16 | 7/8" (22) | 1" (25) | 1" (25) | – | 14 1/4" (362) | – | 1/16" (2) | 1 3/4" (44) | 1 1/2" (38) | 1 1/2" (38) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) For ductile iron pipes and fittings the outside diameters shall be 455mm for PN10 & PN16. (3) Copper alloy flanges are always flat-faced.
14" NB (DN350) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 490 | 445 | 12 | M20 | 23 | 22 | 413 | 415 | 4 | 2 | 26 (1) | – | 22 | – |
| PN 10 | 505 | 460 | 16 | M20 | 23 | 22 | 429 | 430 | 4 | 2 | 30 (1) | – | 26 | 24.5 |
| PN 16 | 520 | 470 | 16 | M24 | 28 | 26 | 429 | 438 | 4 | 2 | 36 (1) | – | 30 | 26.5 |
| PN 25 | 555 | 490 | 16 | M30 | 34 | 33 | 448 | 450 | 4 | 2 | 44 (1) | – | 38 | 30 |
| PN 40 | 580 | 510 | 16 | M33 | 37 | 36 | 465 | 465 | 4 | 2 | – | – | 46 | 44 |
| PN 64 | 600 | 525 | 16 | M36 | – | 39 | – | 465 | – | 2 | – | – | 56 | – |
| PN 100 | 655 | 560 | 16 | M45 | – | 48 | – | 465 | – | 2 | – | – | 74 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 21" (533) | 18 3/4" (476) | 12 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | 16 1/4" (413) | – | 1/16" (2) | 1 3/8" (35) | – | 1 3/8" (35) | – |
| Class 300 | 23" (584) | 20 1/4" (514) | 20 | 1 1/8" (29) | – | 1 1/4" (32) | – | 16 1/4" (413) | – | 1/16" (2) | – | – | 2 1/8" (54) | – |
| Class 600 | 23 3/4" (603) | 20 3/4" (527) | 20 | 1 3/8" (35) | – | 1 1/2" (38) | – | 16 1/4" (413) | – | 1/4" (6) | – | – | 2 3/4" (70) | – |
| Class 900 | 25 1/4" (641) | 22" (559) | 20 | 1 1/2" (38) | – | 1 5/8" (41) | – | 16 1/4" (413) | – | 1/4" (6) | – | – | 3 3/8" (86) | – |
| Class 1500 | 29 1/2" (749) | 25" (635) | 16 | 2 1/4" (57) | – | 2 3/8" (60) | – | 16 1/4" (413) | – | 1/4" (6) | – | – | 5 1/4" (133) | – |
| BS 10 | ||||||||||||||
| Table A | 20 3/4" (527) | 18 1/2" (470) | 8 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1" (25) | 1" (25) | – | – |
| Table D | 20 3/4" (527) | 18 1/2" (470) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/8" (29) | 1" (25) | 1" (25) | – |
| Table E | 20 3/4" (527) | 18 1/2" (470) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/4" (32) | 1" (25) | 1" (25) | – |
| Table F | 21 3/4" (552) | 19 1/2" (495) | 16 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | – | – | – | 1 3/8" (35) | 1 1/4" (32) | 1 1/4" (32) | – |
| Table H | 21 3/4" (552) | 19 1/2" (495) | 16 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | 16 1/2" (419) | – | 1/16" (2) | 1 7/8" (48) | 1 5/8" (41) | 1 5/8" (41) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.
16" NB (DN400) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 540 | 495 | 16 | M20 | 23 | 22 | 463 | 465 | 4 | 2 | 28 (1) | – | 22 | – |
| PN 10 | 565 | 515 | 16 | M24 | 28 | 26 | 480 | 482 | 4 | 2 | 32 (1) | – | 26 | 24.5 |
| PN 16 | 580 | 525 | 16 | M27 | 31 | 30 | 480 | 490 | 4 | 2 | 38 (1) | – | 32 | 28 |
| PN 25 | 620 | 550 | 16 | M33 | 37 | 36 | 503 | 505 | 4 | 2 | 48 (1) | – | 40 | 32 |
| PN 40 | 660 | 585 | 16 | M36 | 41 | 39 | 535 | 535 | 4 | 2 | – | – | 50 | 48 |
| PN 64 | 670 | 585 | 16 | M39 | – | 42 | – | 535 | – | 2 | – | – | 60 | – |
| PN 100 | 715 | 620 | 16 | M45 | – | 48 | – | 535 | – | 2 | – | – | 78 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 23 1/2" (597) | 21 1/4" (540) | 16 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | 18 1/2" (470) | – | 1/16" (2) | 1 7/16" (37) | – | 1 7/16" (37) | – |
| Class 300 | 25 1/2" (648) | 22 1/2" (572) | 20 | 1 1/4" (32) | – | 1 3/8" (35) | – | 18 1/2" (470) | – | 1/16" (2) | – | – | 2 1/4" (57) | – |
| Class 600 | 27" (686) | 23 3/4" (603) | 20 | 1 1/2" (38) | – | 1 5/8" (41) | – | 18 1/2" (470) | – | 1/4" (6) | – | – | 3" (76) | – |
| Class 900 | 27 3/4" (705) | 24 1/4" (616) | 20 | 1 5/8" (41) | – | 1 3/4" (44) | – | 18 1/2" (470) | – | 1/4" (6) | – | – | 3 1/2" (89) | – |
| Class 1500 | 32 1/2" (826) | 27 3/4" (705) | 16 | 2 1/2" (64) | – | 2 5/8" (67) | – | 18 1/2" (470) | – | 1/4" (6) | – | – | 5 3/4" (146) | – |
| BS 10 | ||||||||||||||
| Table A | 22 3/4" (578) | 20 1/2" (521) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/16" (27) | 1" (25) | – | – |
| Table D | 22 3/4" (578) | 20 1/2" (521) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/8" (29) | 1" (25) | 1" (25) | – |
| Table E | 22 3/4" (578) | 20 1/2" (521) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/4" (32) | 1" (25) | 1" (25) | – |
| Table F | 24" (610) | 21 3/4" (552) | 20 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | – | – | – | 1 3/8" (35) | 1 1/4" (32) | 1 1/4" (32) | – |
| Table H | 24" (610) | 21 3/4" (552) | 20 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | 19" (483) | – | 1/16" (2) | 2" (51) | 1 3/4" (44) | 1 3/4" (44) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.
18" NB (DN450) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 595 | 550 | 16 | M20 | 23 | 22 | 518 | 520 | 4 | 2 | 28 (1) | – | 22 | – |
| PN 10 | 615 | 565 | 20 | M24 | 28 | 26 | 530 | 532 | 4 | 2 | 32 (1) | – | 28 | 25.5 |
| PN 16 | 640 | 585 | 20 | M27 | 31 | 30 | 548 | 550 | 4 | 2 | 40 (1) | – | 40 | 30 |
| PN 25 | 670 | 600 | 20 | M33 | 37 | 36 | 548 | 555 | 4 | 2 | 50 (1) | – | 46 | 34.5 |
| PN 40 | 685 | 610 | 20 | M36 | 41 | 39 | 560 | 560 | 4 | 2 | – | – | 57 | 49 |
| PN 64 | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
| PN 100 | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
| ANSI | ||||||||||||||
| Class 125/150 | 25" (635) | 22 3/4" (578) | 16 | 1 1/8" (29) | 1 1/4" (32) | 1 1/4" (32) | – | 21" (533) | – | 1/16" (2) | 1 9/16" (40) | – | 1 9/16" (40) | – |
| Class 300 | 28" (711) | 24 3/4" (629) | 24 | 1 1/4" (32) | – | 1 3/8" (35) | – | 21" (533) | – | 1/16" (2) | – | – | 2 3/8" (60) | – |
| Class 600 | 29 1/4" (743) | 25 3/4" (654) | 20 | 1 5/8" (41) | – | 1 3/4" (44) | – | 21" (533) | – | 1/4" (6) | – | – | 3 1/4" (83) | – |
| Class 900 | 31" (787) | 27" (686) | 20 | 1 7/8" (48) | – | 2" (51) | – | 21" (533) | – | 1/4" (6) | – | – | 4" (102) | – |
| Class 1500 | 36" (914) | 30 1/2" (775) | 16 | 2 3/4" (70) | – | 2 7/8" (73) | – | 21" (533) | – | 1/4" (6) | – | – | 6 3/8" (162) | – |
| BS 10 | ||||||||||||||
| Table A | 25 1/4" (641) | 23" (584) | 12 | 7/8" (22) | – | 1" (25) | – | – | – | – | 1 1/16" (27) | 1 1/16" (27) | – | – |
| Table D | 25 1/4" (641) | 23" (584) | 12 | 7/8" (22) | – | 1" (25) | – | – | – | – | 1 1/4" (32) | 1 1/8" (29) | 1 1/8" (29) | – |
| Table E | 25 1/4" (641) | 23" (584) | 16 | 7/8" (22) | – | 1" (25) | – | – | – | – | 1 3/8" (35) | 1 1/8" (29) | 1 1/8" (29) | – |
| Table F | 26 1/2" (673) | 24" (610) | 20 | 1 1/8" (29) | – | 1 1/4" (32) | – | – | – | – | 1 1/2" (38) | 1 3/8" (35) | 1 3/8" (35) | – |
| Table H | 26 1/2" (673) | 24" (610) | 20 | 1 1/8" (29) | – | 1 1/4" (32) | – | 21" (533) | – | 1/16" (2) | 2 1/8" (54) | 1 7/8" (48) | 1 7/8" (48) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.
20" NB (DN500) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (3) |
Raised Face Diameter Steel (3) |
Raised Face Height Cast Iron (3) |
Raised Face Height Steel (3) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 645 | 600 | 20 | M20 | 23 | 22 | 568 | 570 | 4 | 2 | 30 (1) | – | 24 (2) | – |
| PN 10 | 670 | 620 | 20 | M24 | 28 | 26 | 582 | 585 | 4 | 2 | 34 (1) | – | 28 (2) | 26.5 |
| PN 16 | 715 | 650 | 20 | M30 | 34 | 33 | 609 | 610 | 4 | 2 | 42 (1) | – | 44 (2) | 31.5 |
| PN 25 | 730 | 660 | 20 | M33 | 37 | 36 | 609 | 615 | 4 | 2 | 52 (1) | – | 48 (2) | 36.5 |
| PN 40 | 755 | 670 | 20 | M39 | 44 | 42 | 615 | 615 | 4 | 2 | – | – | 57 (2) | 52 |
| PN 64 | 800 | 705 | 20 | M45 | – | 48 | – | 615 | – | 2 | – | – | 68 (2) | – |
| PN 100 | 870 | 760 | 20 | M52 | – | 56 | – | 615 | – | 2 | – | – | 94 (2) | – |
| ANSI | ||||||||||||||
| Class 125/150 | 27 1/2" (699) | 25" (635) | 20 | 1 1/8" (29) | 1 1/4" (32) | 1 1/4" (32) | – | 23" (584) | – | 1/16" (2) | 1 11/16" (43) | – | 1 11/16" (43) | – |
| Class 300 | 30 1/2" (775) | 27" (686) | 24 | 1 1/4" (32) | – | 1 3/8" (35) | – | 23" (584) | – | 1/16" (2) | – | – | 2 1/2" (64) | – |
| Class 600 | 32" (813) | 28 1/2" (724) | 24 | 1 5/8" (41) | – | 1 3/4" (44) | – | 23" (584) | – | 1/4" (6) | – | – | 3 1/2" (89) | – |
| Class 900 | 33 3/4" (857) | 29 1/2" (749) | 20 | 2" (51) | – | 2 1/8" (54) | – | 23" (584) | – | 1/4" (6) | – | – | 4 1/4" (108) | – |
| Class 1500 | 38 3/4" (984) | 32 3/4" (832) | 16 | 3" (76) | – | 3 1/8" (79) | – | 23" (584) | – | 1/4" (6) | – | – | 7" (178) | – |
| BS 10 | ||||||||||||||
| Table A | 27 3/4" (705) | 25 1/4" (641) | 12 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/8" (29) | 1 1/8" (29) | – | – |
| Table D | 27 3/4" (705) | 25 1/4" (641) | 16 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/4" (32) | 1 1/4" (32) | – | – |
| Table E | 27 3/4" (705) | 25 1/4" (641) | 16 | 7/8" (22) | 1" (25) | 1" (25) | – | – | – | – | 1 1/2" (38) | 1 1/4" (32) | 1 1/4" (32) | – |
| Table F | 29" (737) | 26 1/2" (673) | 24 | 1 1/8" (29) | 1 1/4" (32) | 1 1/4" (32) | – | – | – | – | 1 5/8" (41) | 1 1/2" (38) | 1 1/2" (38) | – |
| Table H | 29" (737) | 26 1/2" (673) | 24 | 1 1/8" (29) | 1 1/4" (32) | 1 1/4" (32) | – | 23 1/2" (597) | – | 1/16" (2) | 2 1/4" (57) | 2" (51) | 2" (51) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) These flange thicknesses are changed substantially as a result of the flange calculation method used in BS EN 1092-1. (3) Copper alloy flanges are always flat-faced.
24" NB (DN600) Flange Dimensions
| Standard / Rating | Flange Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Diameter |
Hole Diameter Iron |
Hole Diameter Steel |
Raised Face Diameter Cast Iron (2) |
Raised Face Diameter Steel (2) |
Raised Face Height Cast Iron (2) |
Raised Face Height Steel (2) |
Flange Thickness | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grey Cast Iron |
Copper Alloy |
Cast & Forged Steel |
Ductile Cast Iron |
|||||||||||
| BS EN 1092 | ||||||||||||||
| PN 6 | 755 | 705 | 20 | M24 | 28 | 26 | 667 | 670 | 5 | 2 | 30 (1) | – | 30 | – |
| PN 10 | 780 | 725 | 20 | M27 | 31 | 30 | 682 | 685 | 5 | 2 | 36 (1) | – | 34 | 30 |
| PN 16 | 840 | 770 | 20 | M33 | 37 | 36 | 720 | 725 | 5 | 2 | 48 (1) | – | 54 | 36 |
| PN 25 | 845 | 770 | 20 | M36 | 41 | 39 | 720 | 720 | 5 | 2 | – | – | 58 | 42 |
| PN 40 | 890 | 795 | 20 | M45 | 50 | 48 | 735 | 735 | 5 | 2 | – | – | 72 | 58 |
| PN 64 | 930 | 820 | 20 | M52 | – | 56 | – | 735 | – | 2 | – | – | 76 | – |
| ANSI | ||||||||||||||
| Class 125/150 | 32" (813) | 29 1/2" (749) | 20 | 1 1/4" (32) | 1 3/8" (35) | 1 3/8" (35) | – | 27 1/4" (692) | – | 1/16" (2) | 1 7/8" (48) | – | 1 7/8" (48) | – |
| Class 300 | 36" (914) | 32" (813) | 24 | 1 1/2" (38) | – | 1 5/8" (41) | – | 27 1/4" (692) | – | 1/16" (2) | – | – | 2 3/4" (70) | – |
| Class 600 | 37" (940) | 33" (838) | 24 | 1 7/8" (48) | – | 2" (51) | – | 27 1/4" (692) | – | 1/4" (6) | – | – | 4" (102) | – |
| Class 900 | 41" (1041) | 35 1/2" (902) | 20 | 2 1/2" (64) | – | 2 5/8" (67) | – | 27 1/4" (692) | – | 1/4" (6) | – | – | 5 1/2" (140) | – |
| Class 1500 | 46" (1168) | 39" (991) | 16 | 3 1/2" (89) | – | 3 5/8" (92) | – | 27 1/4" (692) | – | 1/4" (6) | – | – | 8" (203) | – |
| BS 10 | ||||||||||||||
| Table A | 32 1/2" (826) | 29 3/4" (756) | 12 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | – | – | – | 1 3/16" (30) | 1 3/16" (30) | – | – |
| Table D | 32 1/2" (826) | 29 3/4" (756) | 16 | 1" (25) | 1 1/8" (29) | 1 1/8" (29) | – | – | – | – | 1 3/8" (35) | 1 3/8" (35) | 1 3/8" (35) | – |
| Table E | 32 1/2" (826) | 29 3/4" (756) | 16 | 1 1/8" (29) | 1 1/4" (32) | 1 1/4" (32) | – | – | – | – | 1 5/8" (41) | 1 1/2" (38) | 1 1/2" (38) | – |
| Table F | 33 1/2" (851) | 30 3/4" (781) | 24 | 1 1/4" (32) | 1 1/4" (32) | 1 3/8" (35) | – | – | – | – | 1 3/4" (44) | 1 5/8" (41) | 1 5/8" (41) | – |
| Table H | 33 1/2" (851) | 30 3/4" (781) | 24 | 1 1/4" (32) | 1 3/8" (35) | 1 3/8" (35) | – | 27 1/2" (699) | – | 1/16" (2) | 2 1/2" (64) | 2 1/4" (57) | 2 1/4" (57) | – |
Metric dimensions are given in millimetres. Imperial dimensions are followed by their approximate metric equivalent in brackets. (1) These flange thicknesses are also valid for ductile iron flanges type 21-2. (2) Copper alloy flanges are always flat-faced.