Maybe you don’t know. The dimensions of flanges are not the same as those of other materials. For each standard and pressure level, the size of the flange is also different; for example, the DN50 flange.
For example, in JIS 5K flange, its OD is 130, but in JIS 10K, it is 155. Although the pressure standard is the same, the dimensions are different.
To better understand flange DN50. Please read the article below!
Flange DN50 is a type of accessory used to connect valves, install coupling accessories, or connect pipe sections. DN50 is the size of the flange.
Flange specifications DN50
JIS 5K flange standard specifications

JIS 10K flange standard specifications

JIS 16K flange standard specifications

JIS 20K flange standard specifications


Flange specifications are manufactured according to DIN standards
Flange standard specifications DIN 2576 – PN6

DIN PN6 flange technical datasheet
| DN | Link Details | The outside diameter of the weld neck | Hole diameter | Flange thickness | Beveled face | Thickness of connector | Diameter of welding surface | Length | Weld neck diameter | Connector bevel angle | Weld neck thickness | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Outer diameter | Bolt circle diameter | Bolt hole diameter | Bolt | |||||||||||||||||||
| D | K | L | Quantity | Size | A | B1 | B2 | C1 | C2 C3 |
C4 | E | F | G max | H1 | H2 | H3 | N1 | N2 | N3 | R1 | S | |
| Flange type | ||||||||||||||||||||||
| 01, 02, 05, 11, 12, 13, 21 | 11 21b |
01 12 32 |
2 | 01 02 |
11 12 13 21 |
5 | 2 | 32 | 5 | 12 13 |
11 | 11 | 11 | 12 13 |
21 | 11 12 13 21 |
11 | |||||
| 10 | 75 | 50 | 11 | 4 | M10 | 17,2 | 18 | 21 | 12 | 12 | 12 | 3 | 10 | – | 20 | 28 | 6 | 26 | 25 | 20 | 4 | 1,8 |
| 15 | 80 | 55 | 11 | 4 | M10 | 21,3 | 22 | 25 | 12 | 12 | 12 | 3 | 10 | – | 20 | 30 | 6 | 30 | 30 | 26 | 4 | 2 |
| 20 | 90 | 65 | 11 | 4 | M10 | 26,9 | 27,5 | 31 | 14 | 14 | 14 | 4 | 10 | – | 24 | 32 | 6 | 38 | 40 | 34 | 4 | 2,3 |
| 25 | 100 | 75 | 11 | 4 | M10 | 33,7 | 34,5 | 38 | 14 | 14 | 14 | 4 | 10 | – | 24 | 35 | 6 | 42 | 50 | 44 | 4 | 2,6 |
| 32 | 120 | 90 | 14 | 4 | M12 | 42,4 | 43,5 | 46 | 16 | 14 | 14 | 5 | 10 | – | 26 | 35 | 6 | 55 | 60 | 54 | 6 | 2,6 |
| 40 | 130 | 100 | 14 | 4 | M12 | 48,3 | 49,5 | 53 | 16 | 14 | 14 | 5 | 10 | – | 26 | 38 | 7 | 62 | 70 | 64 | 6 | 2,6 |
| 50 | 140 | 110 | 14 | 4 | M12 | 60,3 | 61,5 | 65 | 16 | 14 | 14 | 5 | 12 | – | 28 | 38 | 8 | 74 | 80 | 74 | 6 | 2,9 |
| 65 | 160 | 130 | 14 | 4 | M12 | 76,1 | 77,5 | 81 | 16 | 14 | 14 | 6 | 12 | 55 | 32 | 38 | 9 | 88 | 100 | 94 | 6 | 2,9 |
| 80 | 190 | 150 | 18 | 4 | M16 | 88,9 | 90,5 | 94 | 18 | 16 | 16 | 6 | 12 | 70 | 34 | 42 | 10 | 102 | 110 | 110 | 8 | 3,2 |
| 100 | 210 | 170 | 18 | 4 | M16 | 114,3 | 116 | 120 | 18 | 16 | 16 | 6 | 14 | 90 | 40 | 45 | 10 | 130 | 130 | 130 | 8 | 3,6 |
| 125 | 240 | 200 | 18 | 8 | M16 | 139,7 | 141,5 | 145 | 20 | 18 | 18 | 6 | 14 | 115 | 44 | 48 | 10 | 155 | 160 | 160 | 8 | 4 |
| 150 | 265 | 225 | 18 | 8 | M16 | 168,3 | 170,5 | 174 | 20 | 18 | 18 | 6 | 14 | 140 | 44 | 48 | 12 | 184 | 185 | 182 | 10 | 4,5 |
| 200 | 320 | 280 | 18 | 8 | M16 | 219,1 | 221,5 | 226 | 22 | 20 | 20 | 6 | 16 | 190 | 44 | 55 | 15 | 236 | 240 | 238 | 10 | 6,3 |
| 250 | 375 | 335 | 18 | 12 | M16 | 273 | 276,5 | 281 | 24 | 22 | 22 | 8 | 18 | 235 | 44 | 60 | 15 | 290 | 295 | 284 | 12 | 6,3 |
| 300 | 440 | 395 | 22 | 12 | M20 | 323,9 | 327,5 | 333 | 24 | 22 | 22 | 8 | 18 | 285 | 44 | 62 | 15 | 342 | 355 | 342 | 12 | 7,1 |
| 350 | 490 | 445 | 22 | 12 | M20 | 355,6 | 359,5 | 365 | 26 | 22 | 22 | 8 | 18 | 330 | – | 62 | 15 | 385 | – | 392 | 12 | 7,1 |
| 400 | 540 | 495 | 22 | 16 | M20 | 406,4 | 411 | 416 | 28 | 22 | 22 | 8 | 20 | 380 | – | 65 | 15 | 438 | – | 442 | 12 | 7,1 |
| 450 | 595 | 550 | 22 | 16 | M20 | 457 | 462 | 467 | 30 | 22 | 24 | 8 | 20 | 425 | – | 65 | 15 | 492 | – | 494 | 12 | 7,1 |
Flange standard specifications DIN 2576 – PN10

DIN PN10 flange technical datasheet
| DN | Link Details | The outside diameter of the weld neck | Hole diameter | Flange thickness | Beveled face | Thickness of connector | Weld face diameter | Length | Weld neck diameter | Connector bevel angle | Weld neck thickness | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Outside diameter | Bolt circle diameter | Bolt hole diameter | Bolt | |||||||||||||||||||||
| D | K | L | Quantity | ទំហំ | A | B1 | B2 | B3 | C1 | C2 | C3 | C4 | E | F | G max | H1 | H2 | H3 | N1 | N2 | N3 | R1 | S | |
| Flange type | ||||||||||||||||||||||||
| 01, 02, 04, 05, 11, 12, 13, 21 | 11 21 34 |
01 12 32 |
2 | 4 | 01 02 04 |
11 12 13 |
21 | 5 | 02 04 |
32 34 |
5 | 12 13 |
11 14 |
11 14 |
11 14 |
12 13 |
21 | 11 12 13 21 |
11 34 |
|||||
| 10 to 40 | Use pressure level PN40 | |||||||||||||||||||||||
| 50 to 150 | Use pressure level PN16 | |||||||||||||||||||||||
| 200 | 340 | 295 | 22 | 8 | M20 | 219,1 | 221,5 | 226 | 240 | 24 | 24 | 24 | 24 | 6 | 20 | 190 | 44 | 62 | 16 | 234 | 246 | 246 | 10 | 6,3 |
| 250 | 395 | 350 | 22 | 12 | M20 | 273 | 276,5 | 281 | 294 | 26 | 26 | 26 | 26 | 8 | 22 | 235 | 46 | 68 | 16 | 292 | 298 | 298 | 12 | 6,3 |
| 300 | 445 | 400 | 22 | 12 | M20 | 323,9 | 327,5 | 333 | 348 | 26 | 26 | 26 | 26 | 8 | 22 | 285 | 46 | 68 | 16 | 342 | 350 | 348 | 12 | 7,1 |
| 350 | 505 | 460 | 22 | 16 | M20 | 355,6 | 359,5 | 365 | 400 | 28 | 26 | 26 | 26 | 8 | 22 | 330 | 53 | 68 | 16 | 385 | 400 | 408 | 12 | 7,1 |
| 400 | 565 | 515 | 26 | 16 | M24 | 406,4 | 411 | 416 | 450 | 32 | 26 | 26 | 26 | 8 | 24 | 380 | 57 | 72 | 16 | 440 | 456 | 456 | 12 | 7,1 |
| 450 | 615 | 565 | 26 | 20 | M24 | 457 | 462 | 467 | 498 | 36 | 28 | 28 | 28 | 8 | 24 | 425 | 63 | 72 | 16 | 488 | 502 | 502 | 12 | 7,1 |
| 500 | 670 | 620 | 26 | 20 | M24 | 508 | 513,5 | 519 | 550 | 38 | 28 | 28 | 28 | 8 | 26 | 475 | 67 | 75 | 16 | 542 | 559 | 559 | 12 | 7,1 |
| 600 | 780 | 725 | 30 | 20 | M27 | 610 | 616,5 | 622 | 650 | 42 | 28 | 34 | 34 | 8 | 26 | 575 | 75 | 80 | 18 | 642 | 658 | 658 | 12 | 7,1 |
| 700 | 895 | 840 | 30 | 24 | M27 | 711 | 30 | 34 | 38 | 670 | 80 | 18 | 746 | 772 | 12 | 8 | ||||||||
| 800 | 1015 | 950 | 33 | 24 | M30 | 813 | 32 | 36 | 42 | 770 | 90 | 18 | 850 | 876 | 12 | 8 | ||||||||
| 900 | 1115 | 1050 | 33 | 28 | M30 | 914 | 34 | 38 | 46 | 860 | 95 | 20 | 950 | 976 | 12 | 10 | ||||||||
| 1000 | 1230 | 1160 | 36 | 28 | M33 | 1016 | 34 | 38 | 52 | 960 | 95 | 20 | 1052 | 1080 | 16 | 10 | ||||||||
| 1200 | 1455 | 1380 | 39 | 32 | M36 | 1219 | 38 | 44 | 60 | 1160 | 115 | 25 | 1256 | 1292 | 16 | 11 | ||||||||
| 1400 | 1675 | 1590 | 42 | 36 | M39 | 1422 | 42 | 48 | 120 | 25 | 1460 | 1496 | 16 | 12 | ||||||||||
| 1600 | 1915 | 1820 | 48 | 40 | M45 | 1626 | 46 | 52 | 130 | 25 | 1666 | 1712 | 16 | 14 | ||||||||||
| 1800 | 2115 | 2020 | 48 | 44 | M45 | 1829 | 50 | 56 | 140 | 30 | 1868 | 1910 | 16 | 15 | ||||||||||
| 2000 | 2325 | 2230 | 48 | 48 | M45 | 2032 | 54 | 60 | 150 | 30 | 2072 | 2120 | 16 | 16 | ||||||||||
| 2200 | 2550 | 2440 | 56 | 52 | M52 | 2235 | 58 | 160 | 35 | 2275 | 18 | 18 | ||||||||||||
| 2400 | 2760 | 2650 | 56 | 56 | M52 | 2438 | 62 | 170 | 35 | 2478 | 18 | 20 | ||||||||||||
| 2600 | 2960 | 2850 | 56 | 60 | M52 | 2620 | 66 | 180 | 40 | 2680 | 18 | 22 | ||||||||||||
| 2800 | 3180 | 3070 | 56 | 64 | M52 | 2820 | 70 | 190 | 40 | 2882 | 18 | 22 | ||||||||||||
| 3000 | 3405 | 3290 | 62 | 68 | M56 | 3020 | 75 | 200 | 45 | 3085 | 18 | 24 | ||||||||||||
Flange standard specifications DIN 2544 – PN16

DIN PN16 flange technical data table
| DN | Link Details | The outside diameter of the weld neck | Hole diameter | Flange thickness | Beveled face | Thickness of connector | Weld face diameter | Length | Weld neck diameter | Connector bevel angle | Weld neck thickness | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Outside diameter | Bolt circle diameter | Bolt hole diameter | Bolt | |||||||||||||||||||||
| D | K | L | Quantity | Size | A | B1 | B2 | B3 | C1 | C2 | C3 | C4 | E | F | G max | H1 | H2 | H3 | N1 | N2 | N3 | R1 | S | |
| Flange type | ||||||||||||||||||||||||
| 01, 02, 04, 05, 11, 12, 13, 21 | 11 21 34 |
01 12 32 |
2 | 4 | 01 02 04 |
11 12 13 |
21 | 5 | 02 04 |
32 34 |
5 | 12 13 |
11 14 |
11 14 |
11 14 |
12 13 |
21 | 11 12 13 21 |
11 34 |
|||||
| 10 to 40 | Use PN40 pressure level flange | |||||||||||||||||||||||
| 50 | 165 | 125 | 18 | 4 | M16 | 60,3 | 61,5 | 65 | 77 | 19 | 18 | 18 | 18 | 5 | 16 | 28 | 45 | 8 | 74 | 84 | 84 | 5 | 2,9 | |
| 65 | 185 | 145 | 18 | 8 | M16 | 76,1 | 77,5 | 81 | 96 | 20 | 18 | 18 | 18 | 6 | 16 | 55 | 32 | 45 | 10 | 92 | 104 | 104 | 6 | 2,9 |
| 80 | 200 | 160 | 18 | 8 | M16 | 88,9 | 90,5 | 94 | 108 | 20 | 20 | 20 | 20 | 6 | 16 | 70 | 34 | 50 | 10 | 105 | 118 | 120 | 6 | 3,2 |
| 100 | 220 | 180 | 18 | 8 | M16 | 114,3 | 116 | 120 | 134 | 22 | 20 | 20 | 20 | 6 | 18 | 90 | 40 | 52 | 12 | 131 | 140 | 140 | 8 | 3,6 |
| 125 | 250 | 210 | 18 | 8 | M16 | 139,7 | 141,5 | 145 | 162 | 22 | 22 | 22 | 22 | 6 | 18 | 115 | 44 | 55 | 12 | 156 | 168 | 170 | 8 | 4 |
| 150 | 285 | 240 | 22 | 8 | M20 | 168,3 | 170,5 | 174 | 188 | 24 | 22 | 22 | 22 | 6 | 20 | 140 | 44 | 55 | 12 | 184 | 195 | 190 | 10 | 4,5 |
| 200 | 340 | 295 | 22 | 12 | M20 | 219,1 | 221,5 | 226 | 240 | 26 | 24 | 24 | 24 | 6 | 20 | 190 | 44 | 62 | 16 | 235 | 246 | 246 | 10 | 6,3 |
| 250 | 405 | 355 | 26 | 12 | M24 | 273 | 276,5 | 281 | 294 | 29 | 26 | 26 | 26 | 8 | 22 | 235 | 46 | 70 | 16 | 292 | 298 | 296 | 12 | 6,3 |
| 300 | 460 | 410 | 26 | 12 | M24 | 323,9 | 327,5 | 33 | 348 | 32 | 28 | 28 | 28 | 8 | 24 | 285 | 46 | 78 | 16 | 344 | 350 | 350 | 12 | 7,1 |
| 350 | 520 | 470 | 26 | 16 | M24 | 355,6 | 359 | 365 | 400 | 35 | 30 | 30 | 30 | 8 | 26 | 330 | 57 | 82 | 16 | 390 | 400 | 410 | 12 | 8 |
| 400 | 580 | 525 | 30 | 16 | M27 | 406,4 | 411 | 416 | 454 | 38 | 32 | 32 | 32 | 8 | 28 | 380 | 63 | 85 | 16 | 445 | 456 | 458 | 12 | 8 |
| 450 | 640 | 585 | 30 | 20 | M27 | 457 | 462 | 467 | 500 | 42 | 40 | 40 | 40 | 8 | 30 | 425 | 68 | 87 | 16 | 490 | 502 | 516 | 12 | 8 |
| 500 | 715 | 650 | 33 | 20 | M30 | 508 | 513,5 | 510 | 556 | 46 | 44 | 44 | 44 | 8 | 32 | 475 | 73 | 90 | 16 | 548 | 559 | 576 | 12 | 8 |
| 600 | 840 | 770 | 36 | 20 | M33 | 610 | 616,5 | 622 | 660 | 52 | 54 | 54 | 54 | 8 | 32 | 575 | 83 | 95 | 18 | 652 | 658 | 690 | 12 | 8,8 |
| 700 | 910 | 840 | 36 | 24 | M33 | 711 | 36 | 42 | 48 | 670 | 83 | 100 | 18 | 755 | 760 | 760 | 12 | 8,8 | ||||||
| 800 | 1025 | 950 | 39 | 24 | M36 | 813 | 38 | 42 | 52 | 770 | 90 | 105 | 20 | 855 | 864 | 862 | 12 | 10 | ||||||
| 900 | 1125 | 1050 | 39 | 28 | M36 | 914 | 40 | 44 | 58 | 860 | 94 | 110 | 20 | 955 | 968 | 962 | 12 | 10 | ||||||
| 1000 | 1255 | 1170 | 42 | 28 | M39 | 1016 | 42 | 46 | 64 | 960 | 100 | 120 | 22 | 1058 | 1072 | 1070 | 16 | 10 | ||||||
| 1200 | 1485 | 1390 | 48 | 32 | M45 | 1219 | 48 | 52 | 76 | 1160 | 130 | 30 | 1262 | 1282 | 16 | 12,5 | ||||||||
| 1400 | 1685 | 1590 | 48 | 36 | M45 | 1422 | 52 | 58 | 1346 | 145 | 30 | 1465 | 1482 | 16 | 14,2 | |||||||||
| 1600 | 1930 | 1820 | 56 | 40 | M52 | 1626 | 58 | 64 | 1546 | 160 | 35 | 1668 | 1696 | 16 | 16 | |||||||||
| 1800 | 2130 | 2020 | 56 | 44 | M52 | 1829 | 62 | 68 | 1746 | 170 | 35 | 1870 | 1896 | 16 | 17,5 | |||||||||
| 2000 | 2345 | 2230 | 62 | 48 | M56 | 2032 | 66 | 70 | 1950 | 180 | 40 | 2072 | 2100 | 16 | 20 | |||||||||
Flange standard specifications DIN 2544 – PN25

DIN PN25 flange technical datasheet
| DN | Link Details | The outside diameter of the weld neck | Hole diameter | Flange thickness | Beveled face | Thickness of connector | Weld face diameter | Length | Weld neck diameter | Connector bevel angle | Weld neck thickness | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Outside diameter | Bolt circle diameter | Bolt hole diameter | Bolt | |||||||||||||||||||||
| D | K | L | Quantity | Size | A | B1 | B2 | B3 | C1 | C2 | C3 | C4 | E | F | G max | H1 | H2 | H3 | N1 | N2 | N3 | R1 | S | |
| Flange type | ||||||||||||||||||||||||
| 01, 02, 04, 05, 11, 12, 13, 21 | 11 21 34 |
01 12 32 |
2 | 4 | 01 02 04 |
11 12 13 |
21 | 5 | 02 04 |
32 34 |
5 | 12 13 |
11 14 |
11 14 |
11 14 |
12 13 |
21 | 11 12 13 21 |
11 34 |
|||||
| 10 to 150 | Use flange type with pressure class PN40 | |||||||||||||||||||||||
| 200 | 360 | 310 | 26 | 12 | M24 | 219,1 | 221,5 | 226 | 250 | 32 | 30 | 30 | 30 | 6 | 26 | 190 | 52 | 80 | 16 | 244 | 256 | 252 | 10 | 6,3 |
| 250 | 425 | 370 | 30 | 12 | M27 | 273 | 276,5 | 281 | 302 | 35 | 32 | 32 | 32 | 8 | 26 | 235 | 60 | 88 | 18 | 298 | 310 | 304 | 12 | 7,1 |
| 300 | 485 | 430 | 30 | 16 | M27 | 323,9 | 327,5 | 333 | 356 | 38 | 34 | 34 | 34 | 8 | 28 | 285 | 67 | 92 | 18 | 352 | 364 | 364 | 12 | 8 |
| 350 | 555 | 490 | 33 | 16 | M30 | 355,6 | 359,5 | 365 | 408 | 42 | 38 | 38 | 38 | 8 | 32 | 332 | 72 | 100 | 20 | 398 | 418 | 418 | 12 | 8 |
| 400 | 620 | 550 | 36 | 16 | M33 | 406,4 | 411 | 416 | 462 | 46 | 40 | 40 | 40 | 8 | 34 | 380 | 78 | 110 | 20 | 452 | 472 | 472 | 12 | 8,8 |
| 450 | 670 | 600 | 36 | 20 | M33 | 457 | 462 | 467 | 510 | 50 | 46 | 46 | 46 | 8 | 36 | 425 | 84 | 110 | 20 | 500 | 520 | 520 | 12 | 8,8 |
| 500 | 730 | 660 | 36 | 20 | M33 | 508 | 513,5 | 519 | 568 | 56 | 48 | 48 | 48 | 8 | 38 | 475 | 90 | 125 | 20 | 558 | 580 | 580 | 12 | 10 |
| 600 | 845 | 770 | 39 | 20 | M36 | 610 | 616,5 | 622 | 670 | 68 | 58 | 58 | 58 | 8 | 40 | 575 | 100 | 125 | 20 | 660 | 684 | 684 | 12 | 11 |
| 700 | 960 | 875 | 42 | 24 | M39 | 711 | 46 | 50 | 125 | 20 | 760 | 780 | 12 | 12,5 | ||||||||||
| 800 | 1085 | 990 | 48 | 24 | M45 | 813 | 50 | 54 | 135 | 22 | 864 | 882 | 12 | 14,2 | ||||||||||
| 900 | 1185 | 1090 | 48 | 28 | M45 | 914 | 54 | 58 | 145 | 24 | 968 | 982 | 12 | 16 | ||||||||||
| 1000 | 1320 | 1210 | 56 | 28 | M52 | 1016 | 58 | 62 | 155 | 24 | 1070 | 1086 | 16 | 17,5 | ||||||||||
| 1200 | 1530 | 1420 | 56 | 32 | M52 | 1219 | 70 | 1296 | 18 | |||||||||||||||
| 1400 | 1755 | 1640 | 62 | 36 | M56 | 1422 | 76 | 1508 | 18 | |||||||||||||||
| 1600 | 1975 | 1860 | 62 | 40 | M56 | 1626 | 84 | 1726 | 20 | |||||||||||||||
| 1800 | 2195 | 2070 | 70 | 44 | M64 | 1829 | 90 | 1920 | 20 | |||||||||||||||
| 2000 | 2425 | 2300 | 70 | 48 | M64 | 2032 | 96 | 2150 | 20 | |||||||||||||||
Flange standard specifications DIN 2544 – PN40

DIN PN40 flange technical datasheet
| DN | Link Details | The outside diameter of the weld neck | Hole diameter | Flange thickness | Beveled face | thickness of connector | Diameter of welding surface | Length | Weld neck diameter | Connector bevel angle | Weld neck thickness | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Outside diameter | Bolt circle diameter | Bolt hole diameter | Bolt | |||||||||||||||||||||
| D | K | L | Quantity | Size | A | B1 | B2 | B3 | C1 | C2 | C3 | C4 | E | F | G max | H1 | H2 | H3 | N1 | N2 | N3 | R1 | S | |
| Lflange type | ||||||||||||||||||||||||
| 01, 02, 04, 05, 11, 12, 13, 21 | 11 21 34 |
01 12 32 |
2 | 4 | 01 02 04 |
11 12 13 |
21 | 5 | 02 04 |
32 34 |
5 | 12 13 |
11 14 |
11 14 |
11 14 |
12 13 |
21 | 11 12 13 21 |
11 34 |
|||||
| 10 | 90 | 60 | 14 | 4 | M12 | 17,2 | 18 | 21 | 31 | 14 | 16 | 16 | 16 | 3 | 12 | 22 | 35 | 6 | 28 | 30 | 28 | 4 | 1,8 | |
| 15 | 95 | 65 | 14 | 4 | M12 | 21,3 | 22 | 25 | 35 | 14 | 16 | 16 | 16 | 3 | 12 | 22 | 38 | 6 | 32 | 35 | 32 | 4 | 2 | |
| 20 | 105 | 75 | 14 | 4 | M12 | 26,9 | 27,5 | 31 | 42 | 16 | 18 | 18 | 18 | 4 | 14 | 26 | 40 | 6 | 40 | 45 | 40 | 4 | 2,3 | |
| 25 | 115 | 85 | 14 | 4 | M12 | 33,7 | 34,5 | 38 | 49 | 16 | 18 | 18 | 18 | 4 | 14 | 28 | 40 | 6 | 46 | 52 | 50 | 4 | 2,6 | |
| 32 | 140 | 100 | 18 | 4 | M16 | 42,4 | 43,5 | 47 | 59 | 18 | 18 | 18 | 18 | 5 | 14 | 30 | 42 | 6 | 56 | 60 | 60 | 6 | 2,6 | |
| 40 | 150 | 110 | 18 | 4 | M16 | 48,3 | 49,5 | 53 | 67 | 18 | 18 | 18 | 18 | 5 | 14 | 32 | 45 | 7 | 64 | 70 | 70 | 6 | 2,6 | |
| 50 | 165 | 125 | 18 | 4 | M16 | 60,3 | 61,5 | 65 | 77 | 20 | 20 | 20 | 20 | 5 | 16 | 34 | 48 | 8 | 75 | 84 | 84 | 6 | 2,9 | |
| 65 | 185 | 145 | 18 | 8 | M16 | 76,1 | 77,5 | 81 | 96 | 22 | 22 | 22 | 22 | 6 | 16 | 55 | 38 | 52 | 10 | 90 | 104 | 104 | 6 | 2,9 |
| 80 | 200 | 160 | 18 | 8 | M16 | 88,9 | 90,5 | 94 | 114 | 24 | 24 | 24 | 24 | 6 | 18 | 70 | 40 | 58 | 12 | 105 | 118 | 120 | 8 | 3,2 |
| 100 | 235 | 190 | 22 | 8 | M20 | 114,3 | 116 | 120 | 138 | 26 | 24 | 24 | 24 | 6 | 20 | 90 | 44 | 65 | 12 | 134 | 145 | 142 | 8 | 3,6 |
| 125 | 270 | 220 | 26 | 8 | M24 | 139,7 | 141,5 | 145 | 166 | 28 | 26 | 26 | 26 | 6 | 22 | 115 | 48 | 68 | 12 | 162 | 170 | 162 | 8 | 4 |
| 150 | 300 | 250 | 26 | 8 | M24 | 168,3 | 170,5 | 174 | 194 | 30 | 28 | 28 | 28 | 6 | 24 | 140 | 52 | 75 | 12 | 192 | 200 | 192 | 10 | 4,5 |
| 200 | 375 | 320 | 30 | 12 | M27 | 219,1 | 221,5 | 226 | 250 | 36 | 34 | 34 | 36 | 6 | 28 | 190 | 52 | 88 | 16 | 244 | 260 | 254 | 10 | 6,3 |
| 250 | 450 | 385 | 33 | 12 | M30 | 273 | 276,5 | 281 | 312 | 38 | 38 | 38 | 38 | 8 | 30 | 235 | 60 | 105 | 18 | 306 | 312 | 312 | 12 | 7,1 |
| 300 | 515 | 450 | 33 | 16 | M30 | 323,9 | 327,5 | 333 | 368 | 42 | 42 | 42 | 42 | 8 | 34 | 285 | 67 | 115 | 18 | 362 | 380 | 378 | 12 | 8 |
| 350 | 580 | 510 | 36 | 16 | M33 | 355,6 | 359,5 | 365 | 418 | 46 | 46 | 46 | 46 | 8 | 36 | 330 | 72 | 125 | 20 | 408 | 424 | 432 | 12 | 8,8 |
| 400 | 660 | 585 | 39 | 16 | M36 | 406,4 | 411 | 416 | 472 | 50 | 50 | 50 | 50 | 8 | 42 | 380 | 78 | 135 | 20 | 462 | 478 | 498 | 12 | 11 |
| 450 | 685 | 610 | 39 | 20 | M36 | 457 | 462 | 467 | 510 | 57 | 57 | 57 | 57 | 8 | 46 | 425 | 84 | 135 | 20 | 500 | 522 | 522 | 12 | 12,5 |
| 500 | 755 | 670 | 42 | 20 | M39 | 508 | 513,5 | 519 | 572 | 57 | 57 | 57 | 57 | 8 | 50 | 475 | 90 | 140 | 20 | 562 | 576 | 576 | 12 | 14,2 |
| 600 | 890 | 795 | 48 | 20 | M45 | 610 | 616,5 | 622 | 676 | 72 | 72 | 72 | 72 | 8 | 54 | 575 | 100 | 150 | 20 | 666 | 686 | 686 | 12 | 16 |
Flange standard specifications manufactured according to ANSI standards
ANSI 150 series flange standard specifications

ANSI 300 series flange standard specifications
???????????? In addition to the popular 150 & 300 series, ANSI flanges also have other series 400, 600, 900, 1500, 2500. You can see more in the table below (Documents cited from the standard ASME/ANSI B16.10/19).
| Current | Tube size (inch) |
Flange outside diameter (mm) |
Pipe outer diameter (mm) |
Number of bolt holes | Bolt hole diameter (mm) |
Bolt circle (mm) |
|---|---|---|---|---|---|---|
| 400 Series | 1/2 | 57,2 | 21,3 | 4,0 | 15,9 | 34,9 |
| 3/4 | 85,7 | 26,7 | 4,0 | 19,1 | 69,9 | |
| 1 | 79,4 | 33,5 | 4,0 | 19,1 | 63,5 | |
| 1-1 / 4 | 120,7 | 42,2 | 4,0 | 19,1 | 54,0 | |
| 1-1 / 2 | 149,2 | 48,3 | 4,0 | 22,2 | 88,9 | |
| 2 | 139,7 | 60,5 | 8,0 | 19,1 | 127,0 | |
| 2-1 / 2 | 165,1 | 73,2 | 8,0 | 22,2 | 104,8 | |
| 3 | 196,9 | 88,9 | 8,0 | 22,2 | 136,5 | |
| 3-1 / 2 | 228,6 | 101,6 | 8,0 | 25,4 | 171,5 | |
| 4 | 254,0 | 114,3 | 8,0 | 25,4 | 181,0 | |
| 5 | 279,4 | 141,2 | 8,0 | 25,4 | 222,3 | |
| 6 | 292,1 | 168,4 | 12,0 | 25,4 | 238,1 | |
| số 8 | 381,0 | 219,2 | 12,0 | 22,2 | 330,2 | |
| 10 | 419,1 | 273,1 | 16,0 | 19,1 | 374,7 | |
| 12 | 495,3 | 323,9 | 16,0 | 15,9 | 412,8 | |
| 14 | 584,2 | 355,6 | 20,0 | 15,9 | 501,7 | |
| 16 | 622,3 | 406,4 | 20,0 | 12,7 | 546,1 | |
| 18 | 711,2 | 457,2 | 24,0 | 12,7 | 590,6 | |
| 20 | 749,3 | 508,0 | 24,0 | 9,5 | 685,8 | |
| 24 | 914,4 | 609,6 | 24,0 | 3,2 | 812,8 | |
| 600 Series | 1/2 | 57,2 | 21,3 | 4,0 | 15,9 | 34,9 |
| 3/4 | 85,7 | 26,7 | 4,0 | 19,1 | 69,9 | |
| 1 | 79,4 | 33,5 | 4,0 | 19,1 | 63,5 | |
| 1-1/4 | 120,7 | 42,2 | 4,0 | 19,1 | 54,0 | |
| 1-1/2 | 149,2 | 48,3 | 4,0 | 22,2 | 88,9 | |
| 2 | 139,7 | 60,5 | 8,0 | 19,1 | 127,0 | |
| 2-1/2 | 165,1 | 73,2 | 8,0 | 22,2 | 104,8 | |
| 3 | 196,9 | 88,9 | 8,0 | 22,2 | 136,5 | |
| 3-1/2 | 228,6 | 101,6 | 8,0 | 25,4 | 171,5 | |
| 4 | 235,0 | 114,3 | 8,0 | 25,4 | 190,5 | |
| 5 | 330,2 | 141,2 | 8,0 | 19,1 | 241,3 | |
| 6 | 355,6 | 168,4 | 12,0 | 19,1 | 266,7 | |
| 8 | 393,7 | 219,2 | 12,0 | 19,1 | 311,2 | |
| 10 | 508,0 | 273,1 | 16,0 | 15,9 | 431,8 | |
| 12 | 558,8 | 323,9 | 20,0 | 15,9 | 476,3 | |
| 14 | 565,2 | 355,6 | 20,0 | 12,7 | 489,0 | |
| 16 | 685,8 | 406,4 | 20,0 | 9,5 | 565,2 | |
| 18 | 730,3 | 457,2 | 20,0 | 6,4 | 616,0 | |
| 20 | 812,8 | 508,0 | 24,0 | 6,4 | 698,5 | |
| 24 | 939,8 | 609,6 | 24,0 | 50,8 | 838,2 | |
| 900 Series | 1/2 | 82,6 | 21,3 | 4,0 | 22,2 | 69,9 |
| 3/4 | 123,8 | 26,7 | 4,0 | 22,2 | 63,5 | |
| 1 | 104,8 | 33,5 | 4,0 | 25,4 | 101,6 | |
| 1-1/4 | 146,1 | 42,2 | 4,0 | 25,4 | 92,1 | |
| 1-1/2 | 177,8 | 48,3 | 4,0 | 22,2 | 79,4 | |
| 2 | 190,5 | 60,5 | 8,0 | 25,4 | 139,7 | |
| 2-1/2 | 212,7 | 73,2 | 8,0 | 22,2 | 165,1 | |
| 3 | 215,9 | 88,9 | 8,0 | 22,2 | 165,1 | |
| 4 | 266,7 | 114,3 | 8,0 | 19,1 | 222,3 | |
| 5 | 311,2 | 141,2 | 8,0 | 15,9 | 279,4 | |
| 6 | 381,0 | 168,4 | 12,0 | 19,1 | 292,1 | |
| 8 | 444,5 | 219,2 | 12,0 | 12,7 | 368,3 | |
| 10 | 520,7 | 273,1 | 16,0 | 12,7 | 444,5 | |
| 12 | 609,6 | 323,9 | 20,0 | 12,7 | 533,4 | |
| 14 | 628,7 | 355,6 | 20,0 | 9,5 | 558,8 | |
| 16 | 666,8 | 406,4 | 20,0 | 6,4 | 603,3 | |
| 18 | 787,4 | 457,2 | 20,0 | 50,8 | 685,8 | |
| 20 | 819,2 | 508,0 | 20,0 | 47,6 | 723,9 | |
| 24 | 1041,4 | 609,6 | 20,0 | 34,9 | 876,3 | |
| ANSI B16.5 covers only sizes through 24″ | ||||||
| 26 | 1047,8 | 20,0 | 28,6 | 927,1 | ||
| 28 | 1168,4 | 20,0 | 73,0 | 1009,7 | ||
| 30 | 1206,5 | 20,0 | 73,0 | 1047,8 | ||
| 32 | 1276,4 | 20,0 | 66,7 | 1130,3 | ||
| 34 | 1397,0 | 20,0 | 60,3 | 1212,9 | ||
| 36 | 1435,1 | 20,0 | 60,3 | 1251,0 | ||
| 1500 Series | 1/2 | 82,6 | 21,3 | 4,0 | 22,2 | 69,9 |
| 3/4 | 123,8 | 26,7 | 4,0 | 22,2 | 63,5 | |
| 1 | 104,8 | 33,5 | 4,0 | 25,4 | 101,6 | |
| 1-1/4 | 146,1 | 42,2 | 4,0 | 25,4 | 92,1 | |
| 1-1/2 | 177,8 | 48,3 | 4,0 | 22,2 | 79,4 | |
| 2 | 190,5 | 60,5 | 8,0 | 25,4 | 139,7 | |
| 2-1/2 | 212,7 | 73,2 | 8,0 | 22,2 | 165,1 | |
| 3 | 241,3 | 88,9 | 8,0 | 19,1 | 203,2 | |
| 4 | 285,8 | 114,3 | 8,0 | 15,9 | 215,9 | |
| 5 | 336,6 | 141,2 | 8,0 | 9,5 | 266,7 | |
| 6 | 368,3 | 168,4 | 12,0 | 12,7 | 292,1 | |
| 8 | 482,6 | 219,2 | 12,0 | 6,4 | 368,3 | |
| 10 | 584,2 | 273,1 | 12,0 | 50,8 | 482,6 | |
| 12 | 647,7 | 323,9 | 16,0 | 47,6 | 546,1 | |
| 14 | 723,9 | 355,6 | 16,0 | 41,3 | 635,0 | |
| 16 | 800,1 | 406,4 | 16,0 | 34,9 | 666,8 | |
| 18 | 914,4 | 457,2 | 16,0 | 28,6 | 749,3 | |
| 20 | 946,2 | 508,0 | 16,0 | 73,0 | 793,8 | |
| 24 | 1168,4 | 609,6 | 16,0 | 60,3 | 990,6 | |
| 2500 Series | 1/2 | 120,7 | 21,3 | 4,0 | 22,2 | 63,5 |
| 3/4 | 114,3 | 26,7 | 4,0 | 22,2 | 57,2 | |
| 1 | 146,1 | 33,5 | 4,0 | 25,4 | 95,3 | |
| 1-1/4 | 171,5 | 42,2 | 4,0 | 22,2 | 123,8 | |
| 1-1/2 | 203,2 | 48,3 | 4,0 | 19,1 | 108,0 | |
| 2 | 222,3 | 60,5 | 8,0 | 22,2 | 133,4 | |
| 2-1/2 | 241,3 | 73,2 | 8,0 | 19,1 | 158,8 | |
| 3 | 304,8 | 88,9 | 8,0 | 15,9 | 228,6 | |
| 4 | 355,6 | 114,3 | 8,0 | 9,5 | 235,0 | |
| 5 | 393,7 | 141,2 | 8,0 | 3,2 | 285,8 | |
| 6 | 482,6 | 168,4 | 8,0 | 47,6 | 342,9 | |
| 8 | 514,4 | 219,2 | 12,0 | 47,6 | 425,5 | |
| 10 | 647,7 | 273,1 | 12,0 | 34,9 | 527,1 | |
| 12 | 762,0 | 323,9 | 12,0 | 28,6 | 600,1 | |
Flange standard specifications BS 4504 – EN 1092
Flange standard specifications BS 4504 PN6

Flange standard specifications BS 4504 PN10

Flange standard specifications BS 4504 PN16

Flange standard specifications BS 4504 PN25

Flange standard specifications BS 4504 PN40

Advantages and applications of DN50 flange
Flange DN50 in particular and flanges in general have been and are important accessories in pipeline projects.
They help keep liquids and gases in pipes from leaking. The connection between pipe segments and other accessories is tighter.
Reinstallation is extremely easy; you just need to weld the pipe and bolt it in place. Especially in large pipes, it is difficult to connect using threaded fittings.
As for DN50 flanges, you can find them in these projects:
- Gas pipeline
- Oil pipeline
- Water pipes
- On pressure vessels, boilers, …

In most piping systems, flange fittings are indispensable. If you are wondering, does Bao Tin Steel have DN50 flanges? Then the answer is YES! However, here there is not only DN50 flange but Bao Tin Steel also provides many types with diverse sizes, standards, designs, etc. Such as:
Hopefully, the knowledge that Bao Tin Steel provides above will be useful to you. If you need to buy a DN50 flanges, you can contact Bao Tin Steel.
Tiger Steel is a branch of Bao Tin Steel.

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