Equivalent flange and fitting standards — ASME, EN, Chinese GB / HG / SH, JIS, IS and BS
Which dimensional standards match each other: ASME B16.5 and B16.47 flanges against EN 1759-1, Chinese HG/T 20615, HG/T 20623, GB/T 9124 and SH/T 3406; EN 1092-1 against HG/T 20592 and GB/T 9124.1; ASME B16.9 and B16.11 fittings against EN 10253, GB/T 12459, GB/T 14383 and JIS. Teshi Group manufactures to all of them.
Cross-reference by product
| USA (ASME / MSS / API) | Europe (EN / ISO) | China (GB / HG / SH) | Japan (JIS) | India (IS) | UK (BS) |
|---|---|---|---|---|---|
| ASME B16.5 Class 150–2500 | EN 1759-1 Class | HG/T 20615 · GB/T 9124.2 · SH/T 3406 | JIS B2220 (not interchangeable) | — | BS 1560 (withdrawn) |
| ASME B16.47 Series A / MSS SP-44 | EN 1759-1 | HG/T 20623 Series A · GB/T 9124.2 | — | — | — |
| ASME B16.47 Series B / API 605 | EN 1759-1 | HG/T 20623 Series B · GB/T 9124.2 | — | — | — |
| EN 1092-1 PN 6–100 | EN 1092-1 (DIN 2631–2638, BS 4504 withdrawn) | HG/T 20592 · GB/T 9124.1 | — | IS 6392 (related) | BS 4504 (withdrawn) |
| ASME B16.9 butt-weld fittings | EN 10253-2 / -4 (Type B) | GB/T 12459 · GB/T 13401 · SH/T 3408 | JIS B2311 / B2312 / B2313 | — | BS 1640 (withdrawn) |
| ASME B16.11 forged fittings | — | GB/T 14383 · SH/T 3410 | JIS B2316 | IS 1239-2 (threaded) | BS 3799 (withdrawn) |
| ASME B16.20 / B16.21 gaskets | EN 1514 / EN 12560 | GB/T 4622.2 · HG/T 20610 · HG/T 20631 | JIS B2404 | — | — |
| ASME B36.10 / B36.19 pipe | EN 10220 / ISO 4200 | GB/T 17395 | JIS G3454 / G3459 | IS 1239-1 / IS 3589 | — |
| ASME B1.20.1 NPT threads | — | GB/T 12716 | — | — | — |
ASME pressure classes and Chinese PN designations
Chinese Class-system standards (HG/T 20615, HG/T 20623) label ASME classes with nominal PN values. These are the same flanges as ASME B16.5 — not the European PN flanges of EN 1092-1 / HG/T 20592.
| ASME class | Chinese PN label | Chinese standards | Dimensions |
|---|---|---|---|
| Class 150 | PN 20 | HG/T 20615 PN 20 · GB/T 9124.2 Class 150 | Class 150 chart |
| Class 300 | PN 50 | HG/T 20615 PN 50 · GB/T 9124.2 Class 300 | Class 300 chart |
| Class 600 | PN 110 | HG/T 20615 PN 110 · GB/T 9124.2 Class 600 | Class 600 chart |
| Class 900 | PN 150 | HG/T 20615 PN 150 · GB/T 9124.2 Class 900 | Class 900 chart |
| Class 1500 | PN 260 | HG/T 20615 PN 260 · GB/T 9124.2 Class 1500 | Class 1500 chart |
| Class 2500 | PN 420 | HG/T 20615 PN 420 · GB/T 9124.2 Class 2500 | Class 2500 chart |
FAQ
Equivalent standards: common questions
What is the Chinese equivalent of ASME B16.5?
HG/T 20615 (chemical industry), GB/T 9124.2 (national standard, Class series) and SH/T 3406 (petrochemical) use ASME B16.5 dimensions. Class 150 is labelled PN 20, Class 300 PN 50, Class 600 PN 110, Class 900 PN 150, Class 1500 PN 260 and Class 2500 PN 420.
What is the Chinese equivalent of EN 1092-1?
HG/T 20592 and GB/T 9124.1 (PN series) follow the European EN 1092-1 system and dimensions.
What is the Chinese equivalent of ASME B16.9 fittings?
GB/T 12459 for seamless butt-weld fittings and GB/T 13401 for welded fittings made from plate; SH/T 3408 in petrochemical plants.
Is JIS B2220 equivalent to ASME B16.5?
No. JIS B2220 uses its own K pressure ratings (5K–30K) and dimensions, so JIS and ASME flanges are not interchangeable.
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