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System of Measurement System of Measurement |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Maximum Pressure Maximum Pressure |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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High-Pressure Threaded Fittings for Compressed Gas
Designed to handle high-pressure welding applications, these fittings are commonly used to connect pressure regulators to compressed gas tanks or cylinders. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance.
Fittings with left-hand threads are identified with a notch in the nut.
Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.
For technical drawings and 3-D models, click on a part number.

- Maximum Pressure: See table
- Maximum Temperature: 120° F
CGA Number | Tank Connection | Regulator Connection | |||||||||
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Tank | Regulator | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||||||
200 | 510 | 0.628"-14 | NGO | Right Hand | 0.880"-14 | NGO | Left Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 000000 |
300 | 510 | 0.830"-14 | NGO | Right Hand | 0.880"-14 | NGO | Left Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethyl Chloride, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 0000 |
520 | 510 | 0.899"-14 | NGO | Right Hand | 0.880"-14 | NGO | Left Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 00000 |

- Maximum Pressure: See table
- Maximum Temperature: 120° F
CGA Number | Tank Connection | Regulator Connection | |||||||||
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Tank | Regulator | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||||||
510 | 200 | 0.880"-14 | NGO | Left Hand | 0.628"-14 | NGO | Right Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 000000 |
510 | 300 | 0.880"-14 | NGO | Left Hand | 0.830"-14 | NGO | Right Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethyl Chloride, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 00000 |
510 | 410 | 0.880"-14 | NGO | Left Hand | 0.855"-14 | NGO | Left Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 00000 |
510 | 520 | 0.880"-14 | NGO | Left Hand | 0.899"-14 | NGO | Right Hand | 500 psi @ 72° F | Acetylene, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Isobutane, Methane, Methyl Chloride, Natural Gas, Propane, Propylene, Vinyl Bromide, Vinyl Chloride | 0000000 | 00000 |
Threaded Hose-to-Propane-Tank Adapters for Compressed Gas

- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
These adapters have a male threaded end that connects to a propane tank and a male threaded end that connects to a hose. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance. Fittings have left-hand threads that are identified with a notch in the nut.
Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.
CGA Number | Hose Connection | Tank Connection | ||||||||
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Hose | Tank | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
023 | 510 | 9/16"-18 | UN/UNF (CGA) | Left Hand | 0.880"-14 | NGO | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |