1. Industry Background
In the global industrial gas equipment trade, cylinder valve threads are a critical technical component.
Each country or region has developed its own standards, differing in thread size, direction, measurement units, and sealing methods.
This diversity presents compatibility challenges for international cooperation and equipment interchangeability.
2. Thread Standard Comparison by Country
| Gas | USA (CGA) | Germany (DIN) | UK (BS 341) | France (NF E) | China (GB) |
| O2 | .903″-14 NGO RH (CGA 540) | G3/4″ | G5/8″ | phi22.91×1.814 | W21.8×1/14″ |
| N2 | .965″-14 NGO RH (CGA 580) | W24.32×1/14″ | G5/8″ | phi21.7×1.814 | W21.8×1/14″ |
| H2 | .825″-14 NGO LH (CGA 350) | W21.8×1/14″ LH | G5/8″ LH | phi21.7×1.814 LH | W20×1/14″ LH |
| CO2 | .825″-14 NGO RH (CGA 320) | W21.8×1/14″ | 0.860″-14 TPI | phi21.7×1.814 | phi27×2 |
| C3H8 | .885″-14 NGO LH (CGA 510) | W21.8×1/14″ LH | G5/8″ LH | phi21.7×1.814 LH | M22×1.5 LH |
3. Common Issues in Global Supply
- Incompatibility between standards
- Regulatory certification mismatches
- Unclear interface specifications from clients
- Complexity of managing multi-standard inventories
4. Chunhe’s Strength: Precision Machining, Deep Standard Knowledge
Chunhe has years of experience in valve manufacturing for export and offers practical, reliable solutions:
- Deep familiarity with CGA, DIN, BS, NF, UNI, GB thread standards
- In-house precision machining using dedicated CNC thread-cutting machines
- Technical drawing and sample-based confirmation process
- Support for CE, ISO 5145, DOT certifications where required
Our equipment and skilled operators ensure every thread is compliant, consistent, and safe for global use.
5. Final Words: Diverse Specs, Precise Execution
Thread standards vary, but the expectation is always the same: accuracy, safety, and reliability.
Chunhe does not rely on generic adaptability—we deliver precision.
We make what fits, and we make it right.