JIS B2220 20K Flange Dimensions
This chart gives JIS B2220 20K steel pipe flange dimensions in millimetres — outside diameter, thickness, raised face, bolt circle, bolt holes and bolt size. JIS B2220 is the Japanese flange standard used on Japanese-design plant, shipbuilding and marine piping.
Teshi Group manufactures JIS B2220 slip-on, weld neck and blind flanges in India for export and marine work.
Key to dimensions
- D
- Outside diameter of flange
- A
- Pipe outside diameter (hub diameter at the weld end)
- C
- Flange thickness, excluding raised face unless stated
- d1
- Raised face diameter
- K
- Bolt circle (pitch circle) diameter
- n
- Number of bolts
- L
- Bolt hole diameter
- Bolt
- Bolt size (metric M or inch diameter)
JIS B2220 20K Flange Dimensions — tables
JIS B2220 20K — slip-on / blind flange dimensions (mm)
| SizeA | APipe OD | DFlange OD | CFlange | d1Raised face | KBolt circle | nBolts | LHole dia | BoltSize |
|---|---|---|---|---|---|---|---|---|
| 10 | 17.3 | 90 | 14 | 46 | 65 | 4 | 15 | M12 |
| 15 | 21.7 | 95 | 14 | 51 | 70 | 4 | 15 | M12 |
| 20 | 27.2 | 100 | 16 | 56 | 75 | 4 | 15 | M12 |
| 25 | 34.0 | 125 | 16 | 67 | 90 | 4 | 19 | M16 |
| 32 | 42.7 | 135 | 18 | 76 | 100 | 4 | 19 | M16 |
| 40 | 48.6 | 140 | 18 | 81 | 105 | 4 | 19 | M16 |
| 50 | 60.5 | 155 | 18 | 96 | 120 | 8 | 19 | M16 |
| 65 | 76.3 | 175 | 20 | 116 | 140 | 8 | 19 | M16 |
| 80 | 89.1 | 200 | 22 | 132 | 160 | 8 | 23 | M20 |
| (90) | 101.6 | 210 | 24 | 145 | 170 | 8 | 23 | M20 |
| 100 | 114.3 | 225 | 24 | 160 | 185 | 8 | 23 | M20 |
| 125 | 139.8 | 270 | 26 | 195 | 225 | 8 | 25 | M22 |
| 150 | 165.2 | 305 | 28 | 230 | 260 | 12 | 25 | M22 |
| 200 | 216.3 | 350 | 30 | 275 | 305 | 12 | 25 | M22 |
| 250 | 267.4 | 430 | 34 | 345 | 380 | 12 | 27 | M24 |
| 300 | 318.5 | 480 | 36 | 395 | 430 | 16 | 27 | M24 |
| 350 | 355.6 | 540 | 40 | 440 | 480 | 16 | 33 | M30×3 |
| 400 | 406.4 | 605 | 46 | 495 | 540 | 16 | 33 | M30×3 |
| 450 | 457.2 | 675 | 48 | 560 | 605 | 20 | 33 | M30×3 |
| 500 | 508.0 | 730 | 50 | 615 | 660 | 20 | 33 | M30×3 |
| (550) | 558.8 | 795 | 52 | 670 | 720 | 20 | 39 | M36×3 |
| 600 | 609.6 | 845 | 54(56) | 720 | 770 | 24 | 39 | M36×3 |
| 650 | 660.4 | 945 | 60 | 790 | 850 | 24 | 48 | M45×3 |
| 700 | 711.2 | 995 | 64 | 840 | 900 | 24 | 48 | M45×3 |
| 750 | 762.0 | 1080 | 68 | 900 | 970 | 24 | 56 | M52×3 |
| 800 | 812.8 | 1140 | 72 | 960 | 1030 | 24 | 56 | M52×3 |
| 850 | 863.6 | 1200 | 74 | 1020 | 1090 | 24 | 56 | M52×3 |
| 900 | 914.4 | 1250 | 76 | 1070 | 1140 | 28 | 56 | M52×3 |
Notes
- All dimensions are in millimetres. Nominal size is the JIS 'A' size (e.g. 100A = DN 100).
- Thickness values in parentheses apply to blind flanges.
- Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
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JIS B2220 20K Flange Dimensions — size by size
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Equivalent and related standards to JIS B2220 20K Flange Dimensions
All equivalents| Region | Standard | Relationship |
|---|---|---|
| Korea | KS B 1511 20K | Korean flanges with JIS-based dimensions |
| Japan | JIS B2239 / B2240 | Cast iron and copper-alloy flanges with the same K ratings |
| USA / Europe | ASME B16.5 / EN 1092-1 | Not interchangeable with JIS K-rated flanges |
Teshi Group manufactures flanges and fittings to all of these standards on request, including Chinese GB / HG / SH and European EN dimensions for export projects. Always confirm bolting, facing and thickness when substituting one standard for another.
FAQ
JIS B2220 20K Flange dimensions: common questions
What are the dimensions of a 100A JIS 20K flange?
A 100A JIS B2220 20K flange has an outside diameter of 225 mm, thickness 24 mm, a bolt circle of 185 mm and 8 holes of 23 mm for M20 bolts.
Is JIS 20K interchangeable with PN 10 or ASME Class 150?
No. JIS B2220 bolt circles and hole counts differ from EN 1092-1 and ASME B16.5 in most sizes, so JIS flanges must mate with JIS flanges of the same rating.
Does Teshi Group manufacture JIS flanges?
Teshi Group manufactures steel flanges in India to JIS B2220 drilling — weld neck, slip-on, plate and blind — in carbon, alloy, stainless, duplex and nickel-alloy grades, with EN 10204 3.1 certificates.
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