Use this gas cylinder size chart to determine the size of compressed gas tanks.
This chart can be used as reference for gas bottles containing industrial, welding and medical gases, such as:*
Oxygen (O2), Acetylene (C2H2), Nitrogen (N2), Argon (Ar), Carbon Dioxide (Co2), Hydrogen (H2), Methane (Ch4), Propane (C3H8), Butane (C4H10), Neon (Ne), Krypton (Kr), Xenon (Xe), Nitrogen Dioxide (No2), Carbon Monoxide (Co), and other gases.
Pure Gases CGA Selection Chart for Fittings
| Pure Gases | CGA Fittings Required |
|---|---|
| Acetylene | 510/300 |
| Air | 590/346/347/702 |
| Ammonia | 240/660/705 |
| Argon | 580/680/677 |
| Arsine* | 350 |
| Carbon Dioxide | 320 |
| Carbon Monoxide | 350 |
| Chlorine | 660 |
| Cyclopropane | 510 |
| Deuterium | 350 |
| Ethane | 350 |
| Ethylene | 350 |
| Ethylene Oxide | 510 |
| Helium | 580/680/677 |
| Hydrogen | 350/695/703 |
| Hydrogen Chloride | 330 |
| Hydrogen Sulfide | 330 |
| Krypton, KR-85 | 580 |
| Methane | 350/695/703 |
| Methyle Chloride | 510 |
| Neon | 580/680/677 |
| Nitrogen | 580/680/677 |
| Nitrous Oxide | 326 |
| Oxygen* | 540/577/701 |
| Phosphine | 350 |
| Propane | 510 |
| Silane* | 350 |
| Sulfur Dioxide | 668/660 |
| Sulfur Hexaflouride | 590 |
| Xenon | 580/680/677 |
*Exception: Flammables in Air or Oxidizers
*Propane in Air, Methane in Air, Carbon Monoxide in Air: CGA 590
The combined characteristics of mixed gases often differ from the characteristics of the separate components, this can result in different CGA connection sizes.
Mixtures which use the same CGA connection when the minor component is in its pure gas form are not included in the list.
The proper fitting size for the mixtures can be determined by looking up the minor component CGA number on the chart for pure gases.
The Compressed Gas Association (CGA) created the standardized valve outlet choices to be used on each gas cylinder.
These standards were created to prevent the inadvertent mixing of gases to avoid possible misuse hazards.
The above chart is for general reference purposes only. Check with your gas supplier to determine the actual CGA connection required for your gas cylinders before ordering a regulator.
