250A JIS B2220 20K Flange Dimensions
250A (DN 250) to JIS B2220: pipe OD 267.4 mm; OD 430 mm; thickness 34 mm; raised face 345 mm; PCD 380 mm.
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)
250A JIS B2220 20K Flange Dimensions — all dimensions
JIS B2220 20K — slip-on / blind flange dimensions (mm)
| Dimension | Value | Equivalent |
|---|---|---|
| Pipe OD — A | 267.4 mm | 10.53 in |
| Flange OD — D | 430 mm | 16.93 in |
| Flange — C | 34 mm | 1.34 in |
| Raised face — d1 | 345 mm | 13.58 in |
| Bolt circle — K | 380 mm | 14.96 in |
| Number of bolts | 12 | |
| Hole dia — L | 27 mm | 1.06 in |
| Bolt size | M24 |
Values are nominal, from JIS B2220 20K Flange Dimensions. Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
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250A JIS B2220 20K Flange Dimensions: common questions
What are the 250A JIS B2220 20K Flange Dimensions?
250A (DN 250) to JIS B2220: pipe OD 267.4 mm; OD 430 mm; thickness 34 mm; raised face 345 mm; PCD 380 mm.
Does Teshi Group manufacture 250A flanges?
Yes. Teshi Group is an OEM manufacturer in India of flanges to JIS B2220, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the 250A dimensions as a PDF?
Yes. Use “Download PDF for this size” on this page to get a single-size, print-ready PDF with the drawing and every tabulated dimension, or download the full JIS B2220 20K Flange Dimensions chart.
Need 250A flanges?
Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
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