1. ANSI / ASME B16.5 – Class 150 (RF Type)
(Reference: ASME B16.5-2020)
2. JIS B2220 – 10K Flange Dimensions
(Reference: JIS B2220-2019)
3. DIN EN 1092-1 – PN16 Flange Dimensions
7. Size Conversion (ASME / JIS / DIN)
| ASME (inch) | JIS (A) | DIN (DN) | Typical Pressure |
| 1/2" | 15A | DN15 | 150# / 10K / PN16 |
| 1" | 25A | DN25 | 150# / 10K / PN16 |
| 2" | 50A | DN50 | 150# / 10K / PN16 |
| 3" | 80A | DN80 | 150# / 10K / PN16 |
| 4" | 100A | DN100 | 150# / 10K / PN16 |
| 6" | 150A | DN150 | 150# / 10K / PN16 |
| 8" | 200A | DN200 | 150# / 10K / PN16 |
| 10" | 250A | DN250 | 150# / 10K / PN16 |
| 12" | 300A | DN300 | 150# / 10K / PN16 |
| 16" | 400A | DN400 | 150# / 10K / PN16 |
| 20" | 500A | DN500 | 150# / 10K / PN16 |
| 24" | 600A | DN600 | 150# / 10K / PN16 |
8. Field Notes
- JIS 10K and ASME 150# may look similar, but their bolt circles differ — they are not interchangeable.
- DIN PN16 flanges are closer to JIS 10K, yet bolt pitch and count can still vary.
- Always verify OD, PCD, and bolt diameter before ordering or fabricating.
Conclusion
Flanges are simple — until you mix standards.
A 2 mm difference in bolt pitch can cause an entire spool to fail alignment.
Always confirm the standard, pressure class, and facing type before fabrication or installation.
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