BS4505 Weld Neck Flange
All Dimensions in Millimetres• Larger Sizes Available For BS4504 Flanges
| PN6 Bar Nominal Pressure (6/2) | ||||||||||||
| NB size | ||||||||||||
| Inch. | MM | A | B | C | D | E | F | G | H | J | R | No. holes |
| 1/2" | 15 | 80.00 | 55.00 | 40.00 | 30.00 | 21.30 | 30.00 | 12.00 | 2.00 | 11.00 | 3.00 | 4 |
| 3/4" | 20 | 90.00 | 65.00 | 50.00 | 38.00 | 26.90 | 32.00 | 14.00 | 2.00 | 11.00 | 4.00 | 4 |
| 1" | 25 | 100.00 | 75.00 | 60.00 | 42.00 | 33.70 | 35.00 | 14.00 | 2.00 | 11.00 | 4.00 | 4 |
| 1-1/4" | 32 | 120.00 | 90.00 | 70.00 | 55.00 | 42.40 | 35.00 | 14.00 | 2.00 | 14.00 | 5.00 | 4 |
| 1-1/2" | 40 | 130.00 | 100.00 | 80.00 | 62.00 | 48.30 | 38.00 | 14.00 | 3.00 | 14.00 | 5.00 | 4 |
| 2" | 50 | 140.00 | 110.00 | 90.00 | 74.00 | 60.30 | 38.00 | 14.00 | 3.00 | 14.00 | 5.00 | 4 |
| 2-1/2" | 65 | 160.00 | 130.00 | 110.00 | 88.00 | 76.10 | 38.00 | 14.00 | 3.00 | 14.00 | 6.00 | 4 |
| 3" | 80 | 190.00 | 150.00 | 128.00 | 102.00 | 88.90 | 42.00 | 16.00 | 3.00 | 18.00 | 6.00 | 4 |
| 4" | 100 | 210.00 | 170.00 | 148.00 | 130.00 | 114.30 | 45.00 | 16.00 | 3.00 | 18.00 | 6.00 | 4 |
| PN10 Bar Nominal Pressure (10/2) & PN16 Bar Nominal Pressure (16/2) | ||||||||||||
| NB size | ||||||||||||
| Inch. | MM | A | B | C | D | E | F | G | H | J | R | No. holes |
| 1/2" | 15 | 95.00 | 65.00 | 45.00 | 32.00 | 21.30 | 35.00 | 14.00 | 2.00 | 14.00 | 3.00 | 4 |
| 3/4" | 20 | 105.00 | 75.00 | 58.00 | 39.00 | 26.90 | 38.00 | 16.00 | 2.00 | 14.00 | 4.00 | 4 |
| 1" | 25 | 115.00 | 85.00 | 68.00 | 46.00 | 33.70 | 38.00 | 16.00 | 2.00 | 14.00 | 4.00 | 4 |
| 1-1/4" | 32 | 140.00 | 100.00 | 78.00 | 56.00 | 42.40 | 40.00 | 16.00 | 2.00 | 18.00 | 5.00 | 4 |
| 1-1/2" | 40 | 150.00 | 110.00 | 88.00 | 64.00 | 48.30 | 42.00 | 16.00 | 3.00 | 18.00 | 5.00 | 4 |
| 2" | 50 | 165.00 | 125.00 | 102.00 | 74.00 | 60.30 | 45.00 | 18.00 | 3.00 | 18.00 | 5.00 | 4 |
| 2-1/2" | 65 | 185.00 | 145.00 | 122.00 | 92.00 | 76.10 | 45.00 | 18.00 | 3.00 | 18.00 | 6.00 | 4 |
| 3" | 80 | 200.00 | 160.00 | 138.00 | 110.00 | 88.90 | 50.00 | 20.00 | 3.00 | 18.00 | 6.00 | 8 |
| 4" | 100 | 220.00 | 180.00 | 158.00 | 130.00 | 114.30 | 52.00 | 20.00 | 3.00 | 18.00 | 6.00 | 8 |
| PN25 Bar Nominal Pressure (25/2) & PN40 Bar Nominal Pressure (40/2) | ||||||||||||
| NB size | ||||||||||||
| Inch. | MM | A | B | C | D | E | F | G | H | J | R | No. holes |
| 1/2" | 15 | 95.00 | 65.00 | 45.00 | 32.00 | 21.30 | 38.00 | 16.00 | 2.00 | 14.00 | 3.00 | 4 |
| 3/4" | 20 | 105.00 | 75.00 | 58.00 | 40.00 | 26.90 | 40.00 | 18.00 | 2.00 | 14.00 | 4.00 | 4 |
| 1" | 25 | 115.00 | 85.00 | 68.00 | 46.00 | 33.70 | 40.00 | 18.00 | 2.00 | 14.00 | 4.00 | 4 |
| 1-1/4" | 32 | 140.00 | 100.00 | 78.00 | 56.00 | 42.40 | 42.00 | 18.00 | 2.00 | 18.00 | 5.00 | 4 |
| 1-1/2" | 40 | 150.00 | 110.00 | 88.00 | 64.00 | 48.30 | 45.00 | 18.00 | 3.00 | 18.00 | 5.00 | 4 |
| 2" | 50 | 165.00 | 125.00 | 102.00 | 74.00 | 60.30 | 48.00 | 20.00 | 3.00 | 18.00 | 5.00 | 4 |
| 2-1/2" | 65 | 185.00 | 145.00 | 122.00 | 92.00 | 76.10 | 52.00 | 22.00 | 3.00 | 18.00 | 6.00 | 8 |
| 3" | 80 | 200.00 | 160.00 | 138.00 | 110.00 | 88.90 | 58.00 | 24.00 | 3.00 | 18.00 | 6.00 | 8 |
| 4" | 100 | 235.00 | 190.00 | 162.00 | 134.00 | 114.30 | 65.00 | 24.00 | 3.00 | 22.00 | 6.00 | 8 |