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.
More
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.
- 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 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Hose Connection | Male Hose Connection | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||||
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 00000 |
- 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 |
- 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 |
- 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 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- 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 |
Nuts for Barbed Hose Fittings for Compressed Gas
Also known as CGA (Compressed Gas Association) nuts, these are designed for low-pressure welding applications downstream of your tank and pressure regulator. Slide a barbed hose adapter for compressed gas into a male or female nut to make a threaded connection to torches or pressure regulators.
Nuts with left-hand threads are identified with a notch.
Brass nuts have good corrosion resistance. Note: Nuts have a CGA number that corresponds to a specific type of gas. Choose a nut 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: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 020 | A | 3/8"-24 | UN/UNF (CGA) | Right Hand | Oxygen | 0000000 | 00000 |
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 000000 | 000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000 | 000 |
| 025 | C | 7/8"-14 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
| 027 | D | 1 1/4"-12 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 00000 |
Threaded Hose-to-Propane-Torch Adapters for Compressed Gas
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
These adapters allow you to connect a hose to a propane torch. 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 | Torch Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hose | Torch | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 023 | 600 | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1"-20 | UN/UNF (CGA) | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |
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 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
Barbed Hose Fittings for Compressed Gas
Commonly used in low-pressure welding applications, these fittings connect downstream of your tank and pressure regulator. Slide the barbed end into rubber hose and secure with a crimp-on hose ferrule. Fittings are brass for good corrosion resistance.
Adapters let you adapt to a threaded end so you can connect welding hose to torches or pressure regulators. They consist of a barbed shaft with a rounded end that sits inside a threaded CGA nut (sold separately) so you can make a threaded hose connection. Adapters with a spiral barbed end twist into hose for an easier installation than adapters with a standard barb.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Attachment Type: Use Crimp-On Hose Ferrules
Adapters | Nuts with Right-Hand Threads | Nuts with Left-Hand Threads | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Hose ID | For CGA Number | Gas Fitting Size | For Use With | Each | CGA Number | Each | CGA Number | Each | |||
Brass | |||||||||||
| 3/16" | 020, 021 | A | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 00000 | 020 | 0000000 | 00000 | __ | 000000 | 00 |
| 3/16" | 022, 023 | B | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 000 | 022 | 000000 | 000 | 023 | 000000 | 00000 |
| 1/4" | 022, 023 | B | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 000 | 022 | 000000 | 000 | 023 | 000000 | 000 |
| 5/16" | 022, 023 | B | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000 | 022 | 000000 | 000 | 023 | 000000 | 000 |
| 3/8" | 022, 023 | B | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000 | 022 | 000000 | 000 | 023 | 000000 | 000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Attachment Type: Use Crimp-On Hose Ferrules
Adapters | Nuts with Right-Hand Threads | Nuts with Left-Hand Threads | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Hose ID | For CGA Number | Gas Fitting Size | For Use With | Each | CGA Number | Each | CGA Number | Each | |||
Brass | |||||||||||
| 3/16" | 022, 023 | B | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 0000000 | 00000 | 022 | 000000 | 00000 | 023 | 000000 | 00000 |
| 1/4" | 022, 023 | B | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 0000000 | 0000 | 022 | 000000 | 000 | 023 | 000000 | 000 |
Quick-Disconnect Hose Couplings for Compressed Gas
Use these couplings to quickly link and unlink welding hoses, torches, and pressure regulators. They consist of a plug and socket that are sold together as a set of two—you’ll get one right-hand connection for oxygen and one left-hand connection for fuel gas. The connections are noninterchangeable and color coded so you can’t mix lines. The male threaded ends attach to threaded welding hose, and the female threaded ends attach to a torch or pressure regulator. To connect couplings, push the plug into the socket; the sleeve on the socket has a spring-loaded lock for gas-tight connections. To disconnect, pull back on the socket sleeve and twist to release the plug. The sockets have a shut-off valve that stops the flow when the coupling is separated so gas won’t leak from the line. The sockets also have a built-in check valve to prevent gas backflow. Couplings are also known as CGA (Compressed Gas Association) couplings. They are brass for good corrosion resistance.
Couplings with left-hand threads are identified with a notch in the nut.
Note: Couplings have a CGA number that corresponds to a specific type of gas. Make sure the CGA number of the coupling matches the CGA number of your tank and other system components.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed
| Includes | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
| One CGA 022 Coupling Adapter (Male Hose Plug × Female Torch Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Torch Socket) | B | 9/16"-18 | UN/UNF (CGA) | Right Hand (CGA 022), Left Hand (CGA 023) | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed
| Includes | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
| One CGA 022 Coupling Adapter (Male Hose Plug × Female Regulator Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Regulator Socket) | B | 9/16"-18 | UN/UNF (CGA) | Right Hand (CGA 022), Left Hand (CGA 023) | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed
| Includes | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
| One CGA 022 Coupling Adapter (Male Hose Plug × Male Hose Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Male Hose Socket) | B | 9/16"-18 | UN/UNF (CGA) | Right Hand (CGA 022), Left Hand (CGA 023) | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000000 |