Stainless Steel Flange Standards
Compare global flange specifications for your project. Quickly check size ranges and pressure ratings (Class/PN).
Select Your Standard Family
Click a card below for detailed dimensions or check the comparison table.
ASME / ANSI B16.5
The global standard for process piping. Widely used in oil, gas, and chemical industries.
NPS 1/2–24
Class 150–2500
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ASME B16.47 Series A / B
Standard for large diameter steel flanges (NPS 26 through NPS 60).
NPS 26–60
Series A / B
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API 6A (Wellhead)
High-pressure specification for wellhead and christmas tree equipment.
2K–20K PSI
6B / 6BX
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Other Standards
EN 1092-1 / DIN: Metric PN ratings for European projects.
JIS B2220: 5K, 10K, 20K for Asian markets.
PN 6–100
5K–40K
View EN/DIN →
Quick Comparison Table
| Standard | Application | Size | Rating |
|---|---|---|---|
| ASME B16.5 | Process Piping | 1/2" – 24" | Cl 150–2500 |
| ASME B16.47 | Large Pipeline | 26" – 60" | Cl 75–900 |
| API 6A | Wellhead | Up to 30" | 2K–20K psi |
| EN 1092-1 | European | DN10–4000 | PN 2.5–400 |
Pro Tip:
Always confirm the mating flange specifications. An ASME Class 150 flange will NOT bolt up to a JIS 10K flange.