ANSI B16.5 Threaded Flange
All Dimensions in Millimetres
• Larger Sizes Available For Screwed Flanges.
• Thread size/spec to be confirmed by customer.
| Class 150 Flanges | ||||||||||
| NB size | ||||||||||
| Inch. | MM | A | B | C | D | F | G | H | J | No. holes |
| 1/2" | 15 | 89.00 | 60.30 | 35.00 | 30.00 | 16.00 | 11.10 | 1.60 | 15.90 | 4 |
| 3/4" | 20 | 98.00 | 69.80 | 43.00 | 38.00 | 16.00 | 12.70 | 1.60 | 15.90 | 4 |
| 1" | 25 | 108.00 | 79.40 | 51.00 | 49.00 | 17.00 | 14.30 | 1.60 | 15.90 | 4 |
| 1-1/4" | 32 | 117.00 | 88.90 | 64.00 | 59.00 | 21.00 | 15.90 | 1.60 | 15.90 | 4 |
| 1-1/2" | 40 | 127.00 | 98.40 | 73.00 | 65.00 | 22.00 | 17.50 | 1.60 | 15.90 | 4 |
| 2" | 50 | 152.00 | 120.60 | 92.00 | 78.00 | 25.00 | 19.00 | 1.60 | 19.00 | 4 |
| 2-1/2" | 65 | 178.00 | 139.70 | 105.00 | 90.00 | 29.00 | 22.20 | 1.60 | 19.00 | 4 |
| 3" | 80 | 190.00 | 152.40 | 127.00 | 108.00 | 30.00 | 23.80 | 1.60 | 19.00 | 4 |
| 3-1/2" | 90 | 216.00 | 177.80 | 140.00 | 122.00 | 32.00 | 23.80 | 1.60 | 19.00 | 8 |
| 4" | 100 | 229.00 | 190.50 | 157.00 | 135.00 | 33.00 | 23.80 | 1.60 | 19.00 | 8 |
| Class 300 Flanges | ||||||||||
| NB size | ||||||||||
| Inch. | MM | A | B | C | D | F | G | H | J | No. holes |
| 1/2" | 15 | 95.00 | 66.70 | 35.00 | 38.00 | 22.00 | 14.30 | 1.60 | 15.90 | 4 |
| 3/4" | 20 | 117.00 | 82.60 | 43.00 | 48.00 | 25.00 | 15.90 | 1.60 | 19.00 | 4 |
| 1" | 25 | 124.00 | 88.90 | 51.00 | 54.00 | 27.00 | 17.50 | 1.60 | 19.00 | 4 |
| 1-1/4" | 32 | 133.00 | 98.40 | 64.00 | 64.00 | 27.00 | 19.00 | 1.60 | 19.00 | 4 |
| 1-1/2" | 40 | 156.00 | 114.30 | 73.00 | 70.00 | 30.00 | 20.60 | 1.60 | 22.20 | 4 |
| 2" | 50 | 165.00 | 127.00 | 92.00 | 84.00 | 33.00 | 22.20 | 1.60 | 19.00 | 8 |
| 2-1/2" | 65 | 190.00 | 149.20 | 105.00 | 100.00 | 38.00 | 25.40 | 1.60 | 22.20 | 8 |
| 3" | 80 | 210.00 | 168.30 | 127.00 | 117.00 | 43.00 | 28.60 | 1.60 | 22.20 | 8 |
| 3-1/2" | 90 | 229.00 | 184.20 | 140.00 | 133.00 | 44.00 | 30.20 | 1.60 | 22.20 | 8 |
| 4" | 100 | 254.00 | 200.00 | 157.00 | 146.00 | 48.00 | 31.80 | 1.60 | 22.20 | 8 |
| Class 600 Flanges | ||||||||||
| NB size | ||||||||||
| Inch. | MM | A | B | C | D | F | G | H | J | No. holes |
| 1/2" | 15 | 95.00 | 66.70 | 35.00 | 38.00 | 22.00 | 20.70 | 6.40 | 15.90 | 4 |
| 3/4" | 20 | 117.00 | 82.60 | 43.00 | 48.00 | 25.00 | 22.30 | 6.40 | 19.00 | 4 |
| 1" | 25 | 124.00 | 88.90 | 51.00 | 54.00 | 27.00 | 23.90 | 6.40 | 19.00 | 4 |
| 1-1/4" | 32 | 133.00 | 98.40 | 64.00 | 64.00 | 29.00 | 27.00 | 6.40 | 19.00 | 4 |
| 1-1/2" | 40 | 156.00 | 114.30 | 73.00 | 70.00 | 32.00 | 28.80 | 6.40 | 22.20 | 4 |
| 2" | 50 | 165.00 | 127.00 | 92.00 | 84.00 | 37.00 | 31.80 | 6.40 | 19.00 | 8 |
| 2-1/2" | 65 | 190.00 | 149.20 | 105.00 | 100.00 | 41.00 | 35.00 | 6.40 | 22.20 | 8 |
| 3" | 80 | 210.00 | 168.30 | 127.00 | 117.00 | 46.00 | 38.20 | 6.40 | 22.20 | 8 |
| 3-1/2" | 90 | 229.00 | 184.20 | 140.00 | 133.00 | 49.00 | 41.30 | 6.40 | 25.40 | 8 |
| 4" | 100 | 254.00 | 215.90 | 157.00 | 152.00 | 54.00 | 44.50 | 6.40 | 25.40 | 8 |
| Class 900 Flanges | ||||||||||
| NB size | ||||||||||
| Inch. | MM | A | B | C | D | F | G | H | J | No. holes |
| 1/2" | 15 | 121.00 | 82.60 | 35.00 | 38.00 | 32.00 | 22.20 | 6.40 | 22.20 | 4 |
| 3/4" | 20 | 130.00 | 88.90 | 43.00 | 44.00 | 35.00 | 25.40 | 6.40 | 22.20 | 4 |
| 1" | 25 | 149.00 | 101.60 | 51.00 | 52.00 | 41.00 | 28.60 | 6.40 | 25.40 | 4 |
| 1-1/4" | 32 | 159.00 | 111.10 | 64.00 | 64.00 | 41.00 | 28.60 | 6.40 | 25.40 | 4 |
| 1-1/2" | 40 | 178.00 | 123.80 | 73.00 | 70.00 | 44.00 | 31.80 | 6.40 | 28.60 | 4 |
| 2" | 50 | 216.00 | 165.10 | 92.00 | 105.00 | 57.00 | 38.10 | 6.40 | 25.40 | 8 |
| 2-1/2" | 65 | 244.00 | 190.50 | 105.00 | 124.00 | 64.00 | 41.30 | 6.40 | 28.60 | 8 |
| 3" | 80 | 241.00 | 190.50 | 127.00 | 127.00 | 54.00 | 38.10 | 6.40 | 25.40 | 8 |
| 4" | 100 | 292.00 | 235.00 | 157.00 | 159.00 | 70.00 | 44.40 | 6.40 | 31.80 | 8 |
| Class 1500 Flanges | ||||||||||
| NB size | ||||||||||
| Inch. | MM | A | B | C | D | F | G | H | J | No. holes |
| 1/2" | 15 | 121.00 | 82.60 | 35.00 | 38.00 | 32.00 | 22.20 | 6.40 | 22.20 | 4 |
| 3/4" | 20 | 130.00 | 88.90 | 43.00 | 44.00 | 35.00 | 25.40 | 6.40 | 22.20 | 4 |
| 1" | 25 | 149.00 | 101.60 | 51.00 | 52.00 | 41.00 | 28.60 | 6.40 | 25.40 | 4 |
| 1-1/4" | 32 | 159.00 | 111.10 | 64.00 | 64.00 | 41.00 | 28.60 | 6.40 | 25.40 | 4 |
| 1-1/2" | 40 | 178.00 | 123.80 | 73.00 | 70.00 | 44.00 | 31.80 | 6.40 | 28.60 | 4 |
| 2" | 50 | 216.00 | 165.10 | 92.00 | 105.00 | 57.00 | 38.10 | 6.40 | 25.40 | 8 |
| 2-1/2" | 65 | 244.00 | 190.50 | 105.00 | 124.00 | 64.00 | 41.30 | 6.40 | 28.60 | 8 |
| 3" | 80 | 241.00 | 190.50 | 127.00 | 127.00 | 54.00 | 38.10 | 6.40 | 25.40 | 8 |
| 4" | 100 | 292.00 | 235.00 | 157.00 | 159.00 | 70.00 | 44.40 | 6.40 | 31.80 | 8 |
| Class 2500 Flanges | ||||||||||
| NB size | ||||||||||
| Inch. | MM | A | B | C | D | F | G | H | J | No. holes |
| 1/2" | 15 | 133.00 | 88.90 | 35.00 | 43.00 | 40.00 | 30.20 | 6.40 | 22.20 | 4 |
| 3/4" | 20 | 140.00 | 95.20 | 43.00 | 51.00 | 43.00 | 31.70 | 6.40 | 22.20 | 4 |
| 1" | 25 | 159.00 | 107.90 | 51.00 | 57.00 | 48.00 | 34.90 | 6.40 | 25.40 | 4 |
| 1-1/4" | 32 | 184.00 | 130.20 | 64.00 | 73.00 | 52.00 | 38.10 | 6.40 | 28.60 | 4 |
| 1-1/2" | 40 | 203.00 | 146.00 | 73.00 | 79.00 | 60.00 | 44.40 | 6.40 | 31.80 | 4 |
| 2" | 50 | 235.00 | 171.40 | 92.00 | 95.00 | 70.00 | 50.80 | 6.40 | 28.60 | 8 |
| 2-1/2" | 65 | 267.00 | 196.80 | 105.00 | 114.00 | 79.00 | 57.10 | 6.40 | 31.80 | 8 |
| 3" | 80 | 305.00 | 228.60 | 127.00 | 133.00 | 92.00 | 66.70 | 6.40 | 34.90 | 8 |
| 4" | 100 | 365.00 | 273.00 | 157.00 | 165.00 | 108.00 | 76.20 | 6.40 | 41.30 | 8 |