YOUR TRUSTED PARTNER
IN THE PIPING INDUSTRY
Forged Flanges
Dimensional arrangements for ASME B16.5 Flanges
Dimensional tables for ASME B16.5 Flanges
CLASS 150 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 90 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
OD | A | 90 | 100 | 110 | 120 | 130 | 150 | 180 | 190 | 215 | 230 | 255 | 280 | 345 | 405 | 485 | 535 | 595 | 635 | 700 | 815 |
MIN THICK * | B | 11.2 | 12.7 | 14.3 | 15.9 | 17.5 | 19.1 | 22.3 | 23.9 | 23.9 | 23.9 | 23.9 | 25.4 | 28.6 | 30.2 | 31.8 | 35.0 | 36.6 | 39.7 | 42.9 | 47.7 |
HUB LENGTH ** | C | 16 | 16 | 17 | 21 | 22 | 25 | 29 | 30 | 32 | 33 | 36 | 40 | 44 | 49 | 56 | 57 | 64 | 68 | 73 | 83 |
HUB LENGTH W/N | H | 48 | 52 | 56 | 57 | 62 | 64 | 70 | 70 | 71 | 76 | 89 | 89 | 102 | 102 | 114 | 127 | 127 | 140 | 145 | 152 |
PCD | K | 60.3 | 69.9 | 79.4 | 88.9 | 98.4 | 120.7 | 139.7 | 152.4 | 177.8 | 190.5 | 215.9 | 241.3 | 298.5 | 362.0 | 431.8 | 476.3 | 539.8 | 577.9 | 635.0 | 749.3 |
BOLT HOLE DIA | L | 16 | 16 | 16 | 16 | 16 | 19 | 19 | 19 | 19 | 19 | 22 | 22 | 22 | 25 | 25 | 29 | 29 | 32 | 32 | 35 |
No. BOLTS | n | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 8 | 8 | 8 | 8 | 12 | 12 | 12 | 16 | 16 | 20 | 20 |
WEIGHT *** | kg | 0.5 | 0.7 | 0.9 | 1.1 | 1.4 | 2.2 | 3.2 | 3.6 | 5.0 | 5.9 | 6.8 | 8.0 | 12.8 | 18.0 | 27.7 | 37.7 | 48.2 | 59.0 | 67.0 | 96.0 |
WEIGHT W/N | kg | 0.9 | 0.9 | 1.4 | 1.4 | 1.8 | 2.8 | 4.6 | 5.2 | 5.5 | 7.8 | 9.6 | 12.5 | 19.9 | 24.6 | 40.0 | 52.0 | 65.0 | 76.0 | 89.4 | 123.0 |
WEIGHT BLIND | kg | 0.9 | 0.9 | 0.9 | 1.4 | 1.8 | 2.3 | 3.2 | 5.5 | 5.9 | 7.7 | 9.1 | 12.0 | 21.4 | 30.5 | 50.0 | 63.0 | 85.0 | 99.0 | 129.0 | 190.0 |
CLASS 300 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 90 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
OD | A | 95 | 115 | 125 | 135 | 155 | 165 | 190 | 210 | 230 | 255 | 280 | 320 | 380 | 445 | 520 | 585 | 650 | 710 | 775 | 915 |
MIN THICK * | B | 12.7 | 14.3 | 15.9 | 19.1 | 20.7 | 22.3 | 25.4 | 28.6 | 30.2 | 31.8 | 35.0 | 36.6 | 41.3 | 47.7 | 50.8 | 54.0 | 57.2 | 60.4 | 63.5 | 69.9 |
HUB LENGTH ** | C | 22 | 25 | 25 | 27 | 30 | 33 | 38 | 43 | 44 | 48 | 51 | 52 | 62 | 67 | 73 | 76 | 83 | 89 | 95 | 106 |
HUB LENGTH W/N | H | 52 | 57 | 60 | 65 | 68 | 70 | 76 | 79 | 81 | 86 | 98 | 98 | 111 | 117 | 130 | 143 | 146 | 159 | 162 | 168 |
PCD | K | 66.7 | 82.6 | 88.9 | 98.4 | 114.3 | 127.0 | 149.2 | 168.3 | 184.2 | 200.0 | 235.0 | 269.9 | 330.2 | 387.4 | 450.8 | 514.4 | 571.5 | 628.6 | 685.8 | 812.8 |
BOLT HOLE DIA | L | 16 | 19 | 19 | 19 | 22 | 19 | 22 | 22 | 22 | 22 | 22 | 22 | 25 | 29 | 32 | 32 | 35 | 35 | 35 | 41 |
No. BOLTS | n | 4 | 4 | 4 | 4 | 4 | 8 | 8 | 8 | 4 | 8 | 8 | 12 | 12 | 16 | 16 | 20 | 20 | 24 | 24 | 24 |
WEIGHT *** | kg | 0.7 | 1.1 | 1.4 | 2.1 | 3.0 | 3.2 | 4.6 | 5.9 | 7.3 | 10.5 | 13.2 | 16.3 | 25.0 | 35.0 | 51.0 | 72.0 | 95.0 | 115.0 | 140.0 | 223.0 |
WEIGHT W/N | kg | 0.9 | 1.4 | 1.8 | 2.3 | 3.2 | 3.6 | 5.5 | 6.9 | 9.1 | 12.1 | 16.4 | 21.1 | 31.4 | 44.0 | 65.0 | 94.0 | 113.0 | 139.0 | 168.0 | 236.0 |
WEIGHT BLIND | kg | 0.9 | 1.4 | 1.8 | 2.7 | 3.2 | 3.6 | 5.5 | 7.3 | 9.6 | 12.7 | 16.8 | 21.8 | 35.9 | 55.0 | 83.0 | 110.0 | 143.0 | 188.0 | 234.0 | 364.0 |
CLASS 600 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 90 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
OD | A | 95 | 115 | 125 | 135 | 155 | 165 | 190 | 210 | 230 | 275 | 330 | 355 | 420 | 510 | 560 | 605 | 685 | 745 | 815 | 940 |
MIN THICK * | B | 14.3 | 15.9 | 17.5 | 20.7 | 22.3 | 25.4 | 28.6 | 31.8 | 35.0 | 38.1 | 44.5 | 47.7 | 55.6 | 63.5 | 66.7 | 69.9 | 76.2 | 82.6 | 88.9 | 101.6 |
HUB LENGTH ** | C | 22 | 25 | 27 | 29 | 32 | 37 | 41 | 46 | 49 | 54 | 60 | 67 | 76 | 86 | 92 | 94 | 106 | 117 | 127 | 140 |
HUB LENGTH W/N | H | 52 | 57 | 62 | 67 | 70 | 73 | 79 | 83 | 86 | 102 | 114 | 117 | 133 | 152 | 156 | 165 | 178 | 184 | 190 | 203 |
PCD | K | 66.7 | 82.6 | 88.9 | 98.4 | 114.3 | 127.0 | 149.2 | 168.3 | 184.2 | 215.9 | 266.7 | 292.1 | 349.2 | 431.8 | 489.0 | 527.0 | 603.2 | 654.0 | 723.9 | 838.2 |
BOLT HOLE DIA | L | 16 | 19 | 19 | 19 | 22 | 20 | 22 | 22 | 25 | 25 | 29 | 29 | 32 | 35 | 35 | 38 | 41 | 45 | 45 | 51 |
No. BOLTS | n | 4 | 4 | 4 | 4 | 4 | 8 | 8 | 8 | 8 | 8 | 8 | 12 | 12 | 16 | 20 | 20 | 20 | 20 | 24 | 24 |
WEIGHT *** | kg | 0.9 | 1.4 | 1.6 | 2.1 | 3.2 | 3.6 | 5.5 | 6.8 | 9.6 | 15.0 | 28.6 | 36.4 | 44.1 | 80.0 | 98.0 | 118.0 | 166.0 | 216.0 | 278.0 | 398.0 |
WEIGHT W/N | kg | 1.4 | 1.6 | 1.8 | 2.5 | 3.6 | 4.6 | 6.4 | 8.2 | 11.8 | 16.8 | 30.9 | 33.2 | 51.0 | 86.0 | 103.0 | 125.0 | 200.0 | 252.0 | 314.0 | 444.0 |
WEIGHT BLIND | kg | 0.9 | 1.4 | 1.8 | 2.7 | 3.6 | 4.6 | 6.8 | 9.1 | 13.2 | 18.6 | 30.9 | 39.1 | 63.0 | 105.0 | 134.0 | 172.0 | 240.0 | 302.0 | 389.0 | 534.0 |
CLASS 900 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 90 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
OD | A | Use CLASS 1500 Dimensions | 240 | Size is not defined by ASME B16.5 | 290 | 350 | 380 | 470 | 545 | 610 | 640 | 705 | 785 | 855 | 1040 | ||||||
MIN THICK * | B | 38.5 | 44.5 | 51.0 | 56.0 | 63.5 | 70.0 | 79.5 | 86.0 | 89.0 | 102.0 | 108.0 | 140.0 | ||||||||
HUB LENGTH ** | C | 54 | 70 | 79 | 86 | 102 | 108 | 117 | 130 | 133 | 152 | 159 | 203 | ||||||||
HUB LENGTH W/N | H | 102 | 114 | 127 | 140 | 162 | 184 | 200 | 213 | 216 | 229 | 248 | 292 | ||||||||
PCD | K | 190.5 | 235.0 | 279.4 | 317.5 | 393.7 | 469.9 | 533.4 | 558.8 | 616.0 | 685.8 | 749.3 | 901.7 | ||||||||
BOLT HOLE DIA | L | 25 | 32 | 35 | 32 | 38 | 38 | 38 | 41 | 45 | 51 | 54 | 66 | ||||||||
No. BOLTS | n | 8 | 8 | 8 | 12 | 12 | 16 | 20 | 20 | 20 | 20 | 20 | 20 | ||||||||
WEIGHT *** | kg | 14.1 | 24.1 | 37.7 | 49.0 | 78.1 | 111.2 | 148.0 | 172.5 | 208.4 | 293.7 | 359.6 | 671.9 | ||||||||
WEIGHT W/N | kg | 13.2 | 23.2 | 39.0 | 49.9 | 84.9 | 121.7 | 168.9 | 255.2 | 311.0 | 419.5 | 528.5 | 956.6 | ||||||||
WEIGHT BLIND | kg | 14.0 | 24.6 | 39.6 | 51.0 | 90.0 | 132.0 | 188.0 | 225.0 | 281.0 | 400.0 | 503.0 | 954.0 | ||||||||
CLASS 1500 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 90 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
OD | A | 120 | 130 | 150 | 160 | 180 | 215 | 245 | 265 | Size is not defined by ASME B16.5 | 310 | 375 | 395 | 485 | 585 | 675 | 750 | 825 | 915 | 985 | 1170 |
MIN THICK * | B | 22.5 | 25.5 | 29.0 | 29.0 | 32.0 | 38.5 | 41.5 | 48.0 | 54.0 | 73.5 | 83.0 | 92.0 | 108.0 | 124.0 | 133.5 | 146.5 | 162.0 | 178.0 | 203.5 | |
HUB LENGTH ** | C | 32 | 35 | 41 | 41 | 44 | 57 | 64 | - | - | - | - | - | - | - | - | - | - | - | - | |
HUB LENGTH W/N | H | 60 | 70 | 73 | 73 | 83 | 102 | 105 | 117 | 124 | 156 | 171 | 213 | 254 | 283 | 298 | 311 | 327 | 356 | 406 | |
PCD | K | 82.6 | 88.9 | 101.6 | 111.1 | 123.8 | 165.1 | 190.5 | 203.2 | 241.3 | 292.1 | 317.5 | 393.7 | 482.6 | 571.5 | 635.0 | 704.8 | 774.7 | 831.8 | 990.6 | |
BOLT HOLE DIA | L | 22 | 22 | 25 | 25 | 29 | 25 | 29 | 35 | 35 | 41 | 38 | 45 | 51 | 55 | 58 | 67 | 73 | 80 | 92 | |
No. BOLTS | n | 4 | 4 | 4 | 4 | 4 | 8 | 8 | 8 | 8 | 8 | 12 | 12 | 12 | 16 | 16 | 16 | 16 | 16 | 16 | |
WEIGHT *** | kg | 2.7 | 2.7 | 3.8 | 4.6 | 6.4 | 10.0 | 16.4 | - | - | - | - | - | - | - | - | - | - | - | - | |
WEIGHT W/N | kg | 2.3 | 3.2 | 3.9 | 4.6 | 6.4 | 10.9 | 16.4 | 21.8 | 31.4 | 60.0 | 75.0 | 124.0 | 206.0 | 314.0 | 380.0 | 775.0 | 644.0 | 775.0 | 1232 | |
WEIGHT BLIND | kg | 1.8 | 2.7 | 4.1 | 4.6 | 6.4 | 11.4 | 15.9 | 21.8 | 33.2 | 65.0 | 72.0 | 137.0 | 230.0 | 352.0 | 420.0 | 558.0 | 760.0 | 965.0 | 1558 | |
Note: | * Min thickness includes raised face but not hub or WN | ||||||||||||||||||||
** Hub length for slip on and threaded flanges | |||||||||||||||||||||
*** Approximate weight SW, SO, LJ & THD (excludes WN) - ALL weights are approximate only |
FAQ
What are forged flanges?
Forged flanges are a type of pipe flange that are made by shaping metal in a forge. In this process, a block of metal is heated and hammered into the desired shape using a forging press or hammer. This is in contrast to other types of flanges, which are either cast or machined from a solid piece of metal.
Forged flanges are known for their strength, durability, and impact resistance, making them a popular choice for use in high-stress applications like oil and gas pipelines, power plants, and chemical processing facilities. They are typically made from materials like carbon steel, stainless steel, or alloy steel, and come in a wide range of sizes, shapes, and configurations to suit different piping needs.
There are several different types of forged flanges, including weld neck flanges, slip-on flanges, blind flanges, socket weld flanges, and threaded flanges. Each of these types has its own unique design and applications, allowing them to be used in a variety of different piping systems.
What are the advantages of forged flanges?
Strength and durability: Forged flanges are made by hammering and shaping metal in a forge, resulting in a product that is stronger and more durable than flanges made by other methods like casting or machining.
Impact resistance: Due to their high strength and durability, forged flanges are more resistant to impact and damage than other types of flanges.
Leak resistance: Forged flanges are designed to provide a tight, leak-proof seal between two pipes, ensuring greater safety and reliability in high-pressure or high-temperature applications.
Wide range of materials: Forged flanges can be made from a variety of materials, including carbon steel, stainless steel, and alloy steel, allowing them to be used in a wide range of piping systems.
Versatility: Forged flanges come in a variety of sizes, shapes, and configurations, making them suitable for use in a wide range of piping applications.
Ease of installation: Forged flanges are relatively easy to install, requiring only a few bolts or screws to connect them to the piping system.
Overall, forged flanges are a reliable and versatile choice for piping systems that require strong, leak-resistant connections.
What is the difference between a forged flange and a cast flange?
The main difference between a forged flange and a cast flange is in the way that they are made. A forged flange is made by shaping metal while it is still in a solid state, using tools such as hammers, presses, or rollers to shape the material into the desired form. This process involves applying high levels of heat and pressure to the metal, which helps to increase the strength and durability of the final product.
On the other hand, a cast flange is made by pouring melted metal into a mold, which then solidifies into the desired shape as it cools. This process is typically used for creating more complex shapes or intricate designs, as it allows for greater flexibility and control over the final product.
In terms of their properties, forged flanges tend to be stronger and more reliable than cast flanges, due to the way that they are formed. They are better able to withstand high levels of pressure and stress, making them ideal for use in demanding applications such as oil and gas pipelines, steam turbines, and high-pressure industrial equipment. Cast flanges, on the other hand, may be more prone to defects or weaknesses, as a result of the casting process.
Overall, the choice between a forged flange and a cast flange will depend on a number of factors, including the application, the level of stress or pressure that will be placed on the flange, and the desired level of strength and durability.