Manufacturers & Exporters of Flanges, Pipe Fittings & Tube Fittings
ISO 9001 : 2015 CERTIFIED Manufacturer
PED 2014/68/EU CERTIFIED Manufacturer
Flanges play an essential role in industrial piping systems, helping to connect pipes, valves, and other equipment. In this post, we'll delve into the specifications and pressure ratings of Class 150, Class 300, and Class 600 flanges, all according to the ASME B16.5 standard. We will also cover flange dimensions, materials, and pressure ratings that will aid in choosing the right flange for your applications.
Flanges are commonly used to connect valves into pipework making it easier for removal and maintenance. There are many common flange standards and flanges within the same standard can etiher be flat (commonly cast iron, ductile iron) or raised face (commonly cast steel and stainless steel).
Class 150 flanges are designed for low-pressure applications and are widely used in piping systems that require a cost-effective solution. Below, we've listed the technical specifications of Class 150 flanges, including the outer diameter, flange thickness, bore, and other essential measurements.
| Nominal Pipe Size (NPS) | Outside Dia of Flange 'O' | Thickness of Flange 'C' | Dia of Hub 'X' | Length Through Hub 'Y' | Thread length T | Bore 'B' | |||||
| Threaded Slip on Socket Welding | Lapped | Weld Neck | Slip onSocket Welding | Lapped | Weld NeckSocket Welding | Depth ofSocket | |||||
| 1/2'' | 88.9 | 11.2 | 30.226 | 15.748 | 15.748 | 47.752 | 15.748 | 22.352 | 22.86 | 15.748 | 9.652 |
| 3/4'' | 98.6 | 12.7 | 38.1 | 15.748 | 15.748 | 52.324 | 15.748 | 27.686 | 28.194 | 20.828 | 11.176 |
| 1'' | 108.0 | 14.2 | 49.276 | 17.526 | 17.526 | 55.626 | 17.526 | 34.544 | 35.052 | 26.67 | 12.7 |
| 1 ¼'' | 117.3 | 15.7 | 58.674 | 20.574 | 20.574 | 57.15 | 20.574 | 43.18 | 43.688 | 35.052 | 14.224 |
| 1 ½'' | 127.0 | 17.5 | 65.024 | 22.352 | 22.352 | 61.976 | 22.352 | 49.53 | 50.038 | 40.894 | 15.748 |
| 2'' | 152.4 | 19.1 | 77.724 | 25.4 | 25.4 | 63.5 | 25.4 | 61.976 | 62.484 | 52.578 | 17.526 |
| 2 ½'' | 177.8 | 22.4 | 90.424 | 28.448 | 28.448 | 69.85 | 28.448 | 74.676 | 75.438 | 62.738 | 19.05 |
| 3'' | 190.5 | 23.9 | 107.95 | 30.226 | 30.226 | 69.85 | 30.226 | 90.678 | 91.44 | 77.978 | 20.574 |
| 3 ½'' | 215.9 | 23.9 | 122.174 | 31.75 | 31.75 | 71.374 | 31.75 | 103.378 | 104.14 | 90.17 | -- |
| 4'' | 228.6 | 23.9 | 134.874 | 33.274 | 33.274 | 76.2 | 33.724 | 116.84 | 116.84 | 102.362 | -- |
| 5'' | 254.0 | 23.9 | 163.576 | 36.576 | 36.576 | 88.9 | 36.576 | 143.764 | 144.526 | 128.27 | -- |
| 6'' | 279.4 | 25.4 | 192.24 | 39.624 | 39.624 | 88.9 | 39.624 | 170.688 | 171.45 | 154.178 | -- |
| 8'' | 342.9 | 28.4 | 246.126 | 44.45 | 44.45 | 101.6 | 44.45 | 221.488 | 222.25 | 202.692 | -- |
| 10'' | 406.4 | 30.2 | 304.8 | 49.276 | 49.276 | 101.6 | 49.276 | 276.352 | 277.368 | 254.508 | -- |
| 12'' | 482.6 | 31.8 | 365.252 | 55.626 | 55.626 | 114.3 | 55.626 | 327.152 | 328.168 | 304.8 | -- |
| 14'' | 533.4 | 35.1 | 400.05 | 57.15 | 79.248 | 127 | 57.15 | 359.156 | 360.172 | -- | |
| 16'' | 596.9 | 36.6 | 457.2 | 63.5 | 87.376 | 127 | 63.5 | 410.464 | 411.226 | To be specified bypurchaser | -- |
| 18'' | 635.0 | 40.1 | 504.952 | 68.326 | 96.774 | 139.7 | 68.326 | 461.772 | 462.28 | -- | |
| 20'' | 698.5 | 42.9 | 558.8 | 73.152 | 103.124 | 144.526 | 73.152 | 513.08 | 514.35 | -- | |
| 24'' | 812.8 | 47.8 | 663.448 | 82.55 | 111.252 | 152.4 | 82.55 | 615.95 | 615.95 | -- | |
Class 300 flanges are designed for moderate-pressure applications. These flanges have a higher pressure rating compared to Class 150, making them suitable for systems that experience higher stress. Below, you’ll find detailed specifications for Class 300 flanges.
| Nominal Pipe Size (NPS) | Outside Dia of Flange 'O' | Thickness of Flange 'C' | Dia of Hub 'X' | Length Through Hub 'Y' | Thread length 'T' | Bore 'B' | Counterbore Threaded Flange 'C' | Depthof Socket | ||||
| Threaded Slip on Socket Welding | Lapped | Weld Neck | Slip on socket Welding | Lapped | Weld Neck Socket Welding | |||||||
| 1/2'' | 95.3 | 14.2 | 38.1 | 22.352 | 22.352 | 52.324 | 15.748 | 22.352 | 22.86 | 15.748 | 23.622 | 9.652 |
| 3/4'' | 117.3 | 15.7 | 47.752 | 25.4 | 25.4 | 57.15 | 15.748 | 27.686 | 28.194 | 20.828 | 28.956 | 11.176 |
| 1'' | 124.0 | 17.5 | 53.848 | 26.924 | 26.924 | 61.976 | 17.526 | 34.544 | 35.052 | 26.67 | 35.814 | 12.7 |
| 1 ¼'' | 133.4 | 19.1 | 63.5 | 26.924 | 26.924 | 65.024 | 20.574 | 43.18 | 43.688 | 35.052 | 44.45 | 14.224 |
| 1 ½'' | 155.4 | 20.6 | 69.85 | 30.226 | 30.226 | 68.326 | 22.352 | 49.53 | 50.038 | 40.894 | 50.292 | 15.748 |
| 2'' | 165.1 | 22.4 | 84.074 | 33.274 | 33.274 | 69.85 | 28.448 | 61.976 | 62.484 | 52.578 | 63.5 | 17.526 |
| 2 ½'' | 190.5 | 25.4 | 100.076 | 38.1 | 38.1 | 76.2 | 31.75 | 74.676 | 75.438 | 62.738 | 76.2 | 19.05 |
| 3'' | 209.6 | 28.4 | 117.348 | 42.926 | 42.926 | 79.248 | 31.75 | 90.678 | 91.44 | 77.978 | 92.202 | 20.574 |
| 3 ½'' | 228.6 | 30.2 | 133.35 | 44.45 | 44.45 | 81.026 | 36.576 | 103.378 | 104.14 | 90.17 | 104.902 | -- |
| 4'' | 254.0 | 31.8 | 146.05 | 47.752 | 47.752 | 85.852 | 36.576 | 116.078 | 116.84 | 102.362 | 117.602 | -- |
| 5'' | 279.4 | 35.1 | 177.8 | 50.8 | 50.8 | 98.552 | 42.926 | 143.764 | 144.526 | 128.27 | 144.526 | -- |
| 6'' | 317.5 | 36.6 | 206.248 | 52.324 | 52.324 | 98.552 | 45.974 | 170.688 | 171.45 | 154.178 | 171.45 | -- |
| 8'' | 381.0 | 41.1 | 260.35 | 61.976 | 61.976 | 111.252 | 50.8 | 221.488 | 222.25 | 202.692 | 222.25 | -- |
| 10'' | 444.5 | 47.8 | 320.548 | 66.548 | 95.25 | 117.348 | 55.626 | 276.352 | 277.368 | 254.508 | 276.352 | -- |
| 12'' | 520.7 | 50.8 | 374.65 | 73.152 | 101.6 | 130.048 | 60.452 | 327.152 | 328.168 | 304.8 | 328.676 | -- |
| 14'' | 584.2 | 53.8 | 425.45 | 76.2 | 111.252 | 142.748 | 63.5 | 359.156 | 360.172 | To be specified bypurchaser | 360.426 | -- |
| 16'' | 647.7 | 57.2 | 482.6 | 82.55 | 120.65 | 146.05 | 68.326 | 410.464 | 411.226 | 411.226 | -- | |
| 18'' | 711.2 | 60.5 | 533.4 | 88.9 | 130.048 | 158.75 | 69.85 | 461.772 | 462.28 | 462.026 | -- | |
| 20'' | 774.7 | 63.5 | 587.248 | 95.25 | 139.7 | 162.052 | 73.152 | 513.08 | 514.35 | 512.826 | -- | |
| 24'' | 914.4 | 69.9 | 701.548 | 106.426 | 152.4 | 168.148 | 82.55 | 615.95 | 615.95 | 614.426 | -- | |
Class 600 flanges are designed for high-pressure systems and are suitable for use in industries such as chemical, oil, and gas. These flanges have a high pressure rating, making them ideal for heavy-duty applications.
| N.B. | A | B | C | D | E | F | G | H | J | K | L | M | N | O | P | R | T | No. of Holes |
| 15 | 95 | 14.3 | 6.4 | 35 | 22 | 38 | 22.4 | 9.5 | 21.3 | 23.5 | 52 | 16 | 22 | 23.0 | 66.7 | 3.0 | 15.9 | 4 |
| 20 | 117 | 15.9 | 6.4 | 43 | 25 | 48 | 27.7 | 11.0 | 26.7 | 29.0 | 57 | 16 | 25 | 28.0 | 82.6 | 3.0 | 19.0 | 4 |
| 25 | 124 | 17.5 | 6.4 | 51 | 27 | 54 | 34.5 | 12.5 | 33.4 | 36.0 | 62 | 17 | 27 | 35.0 | 88.9 | 3.0 | 19.0 | 4 |
| 32 | 133 | 20.6 | 6.4 | 64 | 29 | 64 | 43.2 | 14.5 | 42.2 | 44.5 | 67 | 21 | 29 | 43.5 | 98.4 | 5.0 | 19.0 | 4 |
| 40 | 156 | 22.2 | 6.4 | 73 | 32 | 70 | 49.5 | 16.0 | 48.3 | 50.5 | 70 | 22 | 32 | 50.0 | 114.3 | 6.5 | 22.2 | 4 |
| 50 | 165 | 25.4 | 6.4 | 92 | 37 | 84 | 62.0 | 17.5 | 60.3 | 63.5 | 73 | 29 | 37 | 62.5 | 127.0 | 8.0 | 19.0 | 8 |
| 65 | 190 | 28.6 | 6.4 | 105 | 41 | 100 | 74.7 | 19.0 | 73.0 | 76.0 | 79 | 32 | 41 | 75.5 | 149.2 | 8.0 | 22.2 | 8 |
| 80 | 210 | 31.8 | 6.4 | 127 | 46 | 117 | 90.7 | 20.5 | 88.9 | 92.0 | 83 | 35 | 46 | 91.5 | 168.3 | 9.5 | 22.2 | 8 |
| 90 | 229 | 34.9 | 6.4 | 140 | 49 | 133 | 103.4 | - | 101.6 | 105.0 | 86 | 40 | 49 | 104.0 | 184.2 | 9.5 | 25.4 | 8 |
| 100 | 273 | 38.1 | 6.4 | 157 | 54 | 152 | 116.1 | - | 114.3 | 118.0 | 102 | 41 | 54 | 117.0 | 215.9 | 11.0 | 25.4 | 8 |
| 125 | 330 | 44.4 | 6.4 | 186 | 60 | 189 | 143.8 | - | 141.3 | 145.0 | 114 | 48 | 60 | 145.0 | 266.7 | 11.0 | 28.6 | 8 |
| 150 | 356 | 47.6 | 6.4 | 216 | 67 | 222 | 170.7 | - | 168.3 | 171.0 | 117 | 51 | 67 | 171.0 | 292.1 | 12.5 | 28.6 | 12 |
| 200 | 419 | 55.6 | 6.4 | 270 | 76 | 273 | 221.5 | - | 219.1 | 222.0 | 133 | 57 | 76 | 222.0 | 349.2 | 12.5 | 31.8 | 12 |
| 250 | 508 | 63.5 | 6.4 | 324 | 86 | 343 | 276.4 | - | 273.0 | 276.0 | 152 | 65 | 111 | 277.0 | 431.8 | 12.5 | 34.9 | 16 |
| 300 | 559 | 66.7 | 6.4 | 381 | 92 | 400 | 327.2 | - | 323.9 | 329.0 | 156 | 70 | 117 | 328.0 | 489.0 | 12.5 | 34.9 | 20 |
| 350 | 603 | 69.8 | 6.4 | 413 | 94 | 432 | 359.2 | - | 355.6 | 360.0 | 165 | 73 | 127 | 360.0 | 527.0 | 12.5 | 38.1 | 20 |
| 400 | 686 | 76.2 | 6.4 | 470 | 106 | 495 | 410.5 | - | 406.4 | 411.0 | 178 | 78 | 140 | 411.0 | 603.2 | 12.5 | 41.3 | 20 |
| 450 | 7432 | 82.6 | 6.4 | 533 | 117 | 546 | 461.8 | - | 457.2 | 462.0 | 184 | 79 | 152 | 462.0 | 654.0 | 12.5 | 44.4 | 20 |
| 500 | 813 | 88.9 | 6.4 | 584 | 122 | 610 | 513.1 | - | 508.0 | 513.0 | 190 | 83 | 165 | 514.0 | 723.9 | 12.5 | 44.4 | 24 |
| 600 | 940 | 101.6 | 6.4 | 692 | 140 | 718 | 616.0 | - | 609.6 | 614.0 | 203 | 92 | 184 | 616.0 | 838.2 | 12.5 | 50.8 | 24 |
Need assistance choosing the right Flange for your system? Shribhairav Metal Corporation provides expert support and customized quotes.
📞 Call us: +91 22-6636-2333
📧 Email us: sales@shribhairavforge.com