850A JIS B2220 20K Flange Dimensions
850A (DN 850) to JIS B2220: pipe OD 863.6 mm; OD 1200 mm; thickness 74 mm; raised face 1020 mm; PCD 1090 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)
850A JIS B2220 20K Flange Dimensions — all dimensions
JIS B2220 20K — slip-on / blind flange dimensions (mm)
| Dimension | Value | Equivalent |
|---|---|---|
| Pipe OD — A | 863.6 mm | 34.00 in |
| Flange OD — D | 1200 mm | 47.24 in |
| Flange — C | 74 mm | 2.91 in |
| Raised face — d1 | 1020 mm | 40.16 in |
| Bolt circle — K | 1090 mm | 42.91 in |
| Number of bolts | 24 | |
| Hole dia — L | 56 mm | 2.20 in |
| Bolt size | M52×3 |
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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FAQ
850A JIS B2220 20K Flange Dimensions: common questions
What are the 850A JIS B2220 20K Flange Dimensions?
850A (DN 850) to JIS B2220: pipe OD 863.6 mm; OD 1200 mm; thickness 74 mm; raised face 1020 mm; PCD 1090 mm.
Does Teshi Group manufacture 850A 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 850A 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 850A 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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