JIS B2220 20k Flange
JIS B2220 20k Flange
JIS B2220 is a Japanese Industrial Standard that specifies steel pipe flanges used in piping systems. The 20K designation refers to a flange with a pressure rating of 20 kgf/cm² (approximately 2.0 MPa or 290 psi).
JIS B2220 20k Flange Dimension (mm)
Nominal Dia. of Flange | Outside Dia. of Flange D | Sectional Dimensions of flange | Reference | |||||||||||||||||
| Dia. of Bolt Circle C | Dia. Of raised Face g | Inside Dia. Of Flange do | Outside Dia. of Steel pipe | t | T | Dia. of Hub | Radius r | f | D | Number of Bolt Holes | Holes Dia. H | Nominal Bolt SIZE | S1 | M | S2 | N | L | |||
| a | b | |||||||||||||||||||
| 10 | 90 | 65 | 46 | 17.8 | 17.3 | 14 | 20 | 30 | 32 | 4 | 1 | – | 4 | 15 | M12 | 27 | 4 | 27 | 4 | – |
| 15 | 95 | 70 | 51 | 22.2 | 21.7 | 14 | 20 | 34 | 36 | 4 | 1 | – | 4 | 15 | M12 | 31 | 4 | 31 | 4 | – |
| 20 | 100 | 75 | 56 | 27.7 | 27.2 | 16 | 22 | 40 | 42 | 4 | 1 | – | 4 | 15 | M12 | 37 | 4 | 37 | 4 | – |
| 25 | 125 | 90 | 67 | 34.5 | 34 | 16 | 24 | 48 | 50 | 4 | 1 | 4 | 19 | M16 | 44 | 4 | 44 | 4.5 | – | |
| 32 | 135 | 100 | 76 | 43.2 | 42.7 | 18 | 26 | 56 | 60 | 5 | 2 | – | 4 | 19 | M16 | 52 | 4 | 53 | 5 | – |
| 40 | 140 | 105 | 81 | 49.1 | 48.6 | 18 | 26 | 62 | 66 | 5 | 2 | – | 4 | 19 | M16 | 58 | 4 | 59 | 5.5 | – |
| 50 | 155 | 120 | 96 | 61.1 | 60.5 | 18 | 26 | 76 | 80 | 5 | 2 | – | 8 | 19 | M16 | 70 | 4 | 72 | 5.5 | – |
| 65 | 175 | 140 | 116 | 77.7 | 76.3 | 20 | 30 | 100 | 104 | 5 | 2 | 65.9 | 8 | 19 | M16 | 94 | 6 | – | – | 6 |
| 80 | 200 | 160 | 132 | 90 | 89.1 | 22 | 34 | 113 | 117 | 6 | 2 | 78.1 | 8 | 23 | M20 | 107 | 6 | – | – | 6 |
| -90 | 210 | 170 | 145 | 102.6 | 101.6 | 24 | 36 | 126 | 130 | 6 | 2 | 90.2 | 8 | 23 | M20 | 120 | 6 | – | – | 6 |
| 100 | 225 | 185 | 160 | 115.4 | 114.3 | 24 | 36 | 138 | 142 | 6 | 2 | 102.3 | 8 | 23 | M20 | 132 | 6 | – | – | 6 |
| 125 | 270 | 225 | 195 | 141.2 | 139.8 | 26 | 40 | 166 | 172 | 6 | 2 | 126.6 | 8 | 25 | M22 | 160 | 7 | – | – | 6 |
| 150 | 305 | 260 | 230 | 166.6 | 165.2 | 28 | 42 | 196 | 202 | 6 | 2 | 151 | 12 | 25 | M22 | 186 | 8 | – | – | 6 |
| 200 | 350 | 305 | 275 | 218 | 216.3 | 30 | 46 | 244 | 252 | 6 | 2 | 199.9 | 12 | 25 | M22 | 237 | 9 | – | – | 6 |
| 250 | 430 | 380 | 345 | 269.5 | 267.4 | 34 | 52 | 304 | 312 | 6 | 2 | 248.8 | 12 | 27 | M24 | 290 | 10 | – | – | 6 |
| 300 | 480 | 430 | 395 | 321 | 318.5 | 36 | 56 | 354 | 364 | 8 | 3 | 297.9 | 16 | 27 | M24 | 345 | 11 | – | – | 6 |
| 350 | 540 | 480 | 440 | 358.1 | 355.6 | 40 | 62 | 398 | 408 | 8 | 3 | 333.4 | 16 | 33 | M30X3 | 384 | 12 | – | – | 6 |
| 400 | 605 | 540 | 495 | 409 | 406.4 | 46 | 70 | 446 | 456 | 10 | 3 | 381 | 16 | 33 | M30X3 | 437 | 13 | – | – | 7 |
| 450 | 675 | 605 | 560 | 460 | 457.2 | 48 | 78 | 504 | 514 | 10 | 3 | 431.8 | 20 | 33 | M30X3 | 490 | 15 | – | – | 7 |
| 500 | 730 | 660 | 615 | 511 | 508 | 50 | 84 | 558 | 568 | 10 | 3 | 482.6 | 20 | 33 | M30X3 | 544 | 16 | – | – | 7 |
| -550 | 795 | 720 | 670 | 562 | 558.8 | 52 | 90 | 612 | 622 | 10 | 3 | 533.4 | 20 | 39 | M36X3 | 595 | 16 | – | – | 7 |
| 600 | 845 | 770 | 720 | 613 | 609.6 | 54 | 96 | 666 | 676 | 10 | 3 | 584.2 | 24 | 39 | M36X3 | 646 | 18 | – | – | 7 |
| *650 | 945 | 850 | 790 | 664 | 660.4 | 60 | 5 | 24 | 48 | M45X3 | ||||||||||
| *700 | 995 | 900 | 840 | 715 | 711.2 | 64 | 5 | 24 | 48 | M45X3 | ||||||||||
| *750 | 1080 | 970 | 900 | 766 | 762 | 68 | 5 | 24 | 56 | M52X3 | ||||||||||
| *800 | 1140 | 1030 | 960 | 817 | 812.8 | 72 | 5 | 24 | 56 | M52X3 | ||||||||||
| *850 | 1200 | 1090 | 1020 | 868 | 863.6 | 74 | 5 | 24 | 56 | M52X3 | ||||||||||
| *900 | 1250 | 1140 | 1070 | 919 | 914.4 | 76 | 5 | 28 | 56 | M52X3 | ||||||||||
Key Specifications
- Pressure Rating: 20K (20 kgf/cm² or 2.0 MPa)
- Material: Common materials include SS400, SF440, SUS304, SUS316, etc.
- Types:
- Slip-on Flange (SO)
- Weld Neck Flange (WN)
- Blind Flange (BL)
- Socket Weld Flange (SW)
- Lap Joint Flange (LJ)
- Sizes: Typically from 10A (½”) to 1500A (60”)
Applications
- Oil and Gas Pipelines
- Water Treatment Plants
- Petrochemical
- Construction
- Pressure Vessels
- Phosphate Mining