DN 250 IS 1538 Flange Dimensions (Cast Iron Fittings)
DN 250 (10") to IS 1538: OD 395 mm; thickness 26 mm; PCD 350 mm; bolts 12; holes 23 mm.
Key to dimensions
- D
- Outside diameter of flange
- C
- Flange thickness, excluding raised face unless stated
- d1
- Raised face diameter
- f
- Raised face height
- K
- Bolt circle (pitch circle) diameter
- n
- Number of bolts
- L
- Bolt hole diameter
- Bolt
- Bolt size (metric M or inch diameter)
DN 250 IS 1538 Flange Dimensions (Cast Iron Fittings) — all dimensions
IS 1538 Tables 4 & 6 — flanges of pipes and fittings: dimensions and standard drilling
| Dimension | Value | Equivalent |
|---|---|---|
| Flange OD — D | 395 mm | 15.55 in |
| Flange — C | 26 mm | 1.02 in |
| Bolt circle — K | 350 mm | 13.78 in |
| Number of bolts | 12 | |
| Hole dia — L | 23 mm | 0.906 in |
| Bolt dia | 20 |
IS 1538 Table 5 — raised flanges
| Dimension | Value | Equivalent |
|---|---|---|
| Flange OD — D | 395 mm | 15.55 in |
| Raised face — d1 | 319 mm | 12.56 in |
| Incl. raised face — C | 29 mm | 1.14 in |
| Flange — C | 26 mm | 1.02 in |
| RF height — f | 3 mm | 0.118 in |
| Bolt circle — K | 350 mm | 13.78 in |
| Number of bolts | 12 | |
| Hole dia — L | 23 mm | 0.906 in |
| Bolt dia | 20 |
IS 1538 Table 21 — double flanged 1/4 (90°) bends
| Dimension | Value | Equivalent |
|---|---|---|
| Wall thickness — e | 14.0 mm | 0.551 in |
| Bend radius — r | 290 mm | 11.42 in |
| Straight — a | 60 mm | 2.36 in |
| Centre to face — b | 350 mm | 13.78 in |
| Mass approx. — kg | 72 mm | 2.83 in |
Values are nominal, from IS 1538 Flange Dimensions (Cast Iron Fittings). Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
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Other sizes — IS 1538 Flange Dimensions (Cast Iron Fittings)
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DN 250 IS 1538 Flange Dimensions (Cast Iron Fittings): common questions
What are the DN 250 IS 1538 Flange Dimensions (Cast Iron Fittings)?
DN 250 (10") to IS 1538: OD 395 mm; thickness 26 mm; PCD 350 mm; bolts 12; holes 23 mm.
Does Teshi Group manufacture DN 250 flanges?
Yes. Teshi Group is an OEM manufacturer in India of flanges to IS 1538, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the DN 250 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 IS 1538 Flange Dimensions (Cast Iron Fittings) chart.
Need DN 250 flanges?
Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
Ready to build to spec?
Share your drawing, bill of materials or technical requirements with the Teshi team.