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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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![]() | Pipe |
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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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Commonly used in high-pressure welding applications, these nipples connect your tank to the inlet of a pressure regulator. One side has a threaded pipe end and the other side has a rounded end that sits inside a threaded nut (sold separately) so you can make a threaded connection.
Brass nipples have good corrosion resistance and are softer than 316 stainless steel nipples, so they're easier to thread together. Chrome-plated brass nipples have better corrosion and wear resistance than unplated brass nipples and have a bright, shiny appearance.
Nipples that tighten by hand should be paired with a nut with a plastic grip.
For technical drawings and 3-D models, click on a part number.
Regulator Connection | ||||||
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For Number (Max. Pressure) | Pipe Size | Thread Type | Lg. | For Use With | Each | |
Brass—Tighten With Wrench | ||||||
CGA 170 (3,000 psi @ 72° F) | 1/8 | NPT | 1 1/4" | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 000000 |
CGA 180 (3,000 psi @ 72° F) | 1/8 | NPT | 2" | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 00000 |
CGA 320 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Carbon Dioxide | 000000000 | 0000 |
DIN 477 No. 6 (4,350 psi @ 72° F) | 1/4 | NPT | 3 1/2" | Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon | 000000000 | 00000 |
Brass—Tighten By Hand | ||||||
CGA 320 (3,000 psi @ 72° F) | 1/4 | NPT | 2 33/64" | Carbon Dioxide | 000000000 | 0000 |
Chrome-Plated Brass—Tighten With Wrench | ||||||
CGA 320 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Carbon Dioxide | 000000000 | 00000 |
Number | Gender | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | ||||||||
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CGA 320 | Female | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 00000 |
Brass with Plastic Grip | ||||||||
CGA 320 | Female | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 00000 |
Aluminum-Plated Brass | ||||||||
CGA 170 | Female | 9/16"-18 | UN/UNF (CGA) | Right Hand | 3,000 psi @ 72° F | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 0000 |
CGA 180 | Female | 5/8"-18 | UN/UNF (CGA) | Right Hand | 3,000 psi @ 72° F | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 00000 |
DIN 477 No. 6 | Female | W 21.8 | Metric | Right Hand | 3,000 psi @ 72° F | Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon | 000000000 | 00000 |
Chrome-Plated Brass | ||||||||
CGA 320 | Female | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 0000 |
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.
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 | |||||||||||
320 | 580 | 0.830"-14 | NGO | Right Hand | 0.960"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Carbon Dioxide, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 000000 |
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 | |||||||||||
580 | 320 | 0.960"-14 | NGO | Right Hand | 0.830"-14 | NGO | Left Hand | 3,000 psi @ 72° F | Argon, Carbon Dioxide, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 000000 |
Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.
Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together. Aluminum-plated brass nuts have better corrosion and wear resistance than unplated brass. Chrome-plated brass nuts have comparable corrosion and wear resistance to aluminum-plated brass nuts, and have a bright, shiny appearance.
Nuts with a plastic grip can be tightened by hand instead of with a wrench.
Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.
For technical drawings and 3-D models, click on a part number.
Number | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||
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CGA 320 | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 00000 |
Brass with Plastic Grip | |||||||
CGA 320 | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 00000 |
Aluminum-Plated Brass | |||||||
CGA 170 | 9/16"-18 | UN/UNF (CGA) | Right Hand | 3,000 psi @ 72° F | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 0000 |
CGA 180 | 5/8"-18 | UN/UNF (CGA) | Right Hand | 3,000 psi @ 72° F | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 00000 |
DIN 477 No. 6 | W 21.8 | Metric | Right Hand | 3,000 psi @ 72° F | Argon, Carbon Dioxide, Cyclobutane, Dichlorotetrafluoroethane, Helium, Krypton, Sulfur Hexafluoride, Trifluoroethane, Xenon | 000000000 | 00000 |
Chrome-Plated Brass | |||||||
CGA 320 | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 0000 |