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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Threaded Hose Fittings for Compressed Gas
Use these fittings to connect welding hose to pressure regulators and torches. They are also known as CGA (Compressed Gas Association) fittings. Fittings 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.
Straight Adapters, Female Hose × Female Pipe
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Hose Connection | Female Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number  | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000 | 000000 |
Straight Adapters, Female Hose × Male Pipe
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Hose Connection | Male Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |
Straight Adapters, Female Pipe × Male Hose
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Pipe Connection | Male Hose Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Type | Thread Direction | CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 1/4 | NPT | Right Hand | 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |
Straight Adapters, Male Hose × Male Pipe
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Male Hose Connection | Male Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 00000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/8 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 0000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 3/8 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
Caps, Female Hose
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Chain Lg. | For Use With | Each | |
Brass | ||||||||
|---|---|---|---|---|---|---|---|---|
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 6" | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 00000 |