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High-Pressure Nipples for Compressed Gas
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. 316 stainless steel nipples have excellent corrosion resistance.
Nipples with filter help keep the line clean by preventing small particles and other impurities from entering your pressure regulator.
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.
Nipples, Tank × Male Regulator
- Maximum Pressure: See table
- Maximum Temperature: 120° F
Regulator Connection | |||||||
|---|---|---|---|---|---|---|---|
| For Number (Max. Pressure) | Pipe Size  | Thread Type | Lg. | For Use With | Features | 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 200 (500 psi @ 72° F) | 1/8 | NPT | 1 1/4" | Acetylene | __ | 000000000 | 0000 |
| CGA 280 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/64" | Medical Gas Mixtures | __ | 000000000 | 0000 |
| CGA 296 (3,000 psi @ 72° F) | 1/4 | NPT | 3" | Oxygen Mixtures | __ | 000000000 | 0000 |
| CGA 300 (500 psi @ 72° F) | 1/4 | NPT | 1 15/16" | Ethyl Chloride | __ | 000000000 | 0000 |
| CGA 320 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Carbon Dioxide | __ | 000000000 | 0000 |
| CGA 326 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Nitrous Oxide | __ | 000000000 | 0000 |
| CGA 330 (3,000 psi @ 72° F) | 1/4 | NPT | 2" | Boron Trifluoride, Carbonyl Sulfide, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Iodide, Hydrogen Sulfide, Methyl Bromide, Silicon Tetrafluoride, Sulfur Tetrafluoride | __ | 000000000 | 0000 |
| CGA 346 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Air | __ | 000000000 | 0000 |
| CGA 347 (4,700 psi @ 72° F) | 1/4 | NPT | 3" | Air | __ | 000000000 | 00000 |
| CGA 350 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | __ | 000000000 | 0000 |
| CGA 350 (3,000 psi @ 72° F) | 1/4 | NPT | 3" | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | __ | 0000000 | 0000 |
| CGA 410 (500 psi @ 72° F) | 1/4 | NPT | 2 33/64" | Acetylene | __ | 000000000 | 0000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 000000000 | 0000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 3" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 000000000 | 0000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 3 1/2" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 000000000 | 0000 |
| CGA 520 (500 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Acetylene | __ | 000000000 | 0000 |
| CGA 540 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/16" | Oxygen | __ | 000000000 | 0000 |
| CGA 555 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/16" | Butane, LP Gas | __ | 000000000 | 0000 |
| CGA 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | __ | 000000000 | 00000 |
| CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F) | 1/4 | NPT | 3" | Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon | __ | 000000000 | 00000 |
| CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (5,500 psi @ 72° F) | 1/4 | NPT | 3 1/64" | Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon | Filter | 000000000 | 00000 |
| CGA 701 (4,700 psi @ 72° F) | 1/4 | NPT | 3" | Oxygen | Filter | 000000000 | 00000 |
| BS 341 No. 3 (4,350 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane | __ | 000000000 | 00000 |
| 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 | 00000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 0000000 | 00000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 3" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 0000000 | 00000 |
| CGA 510 (500 psi @ 72° F); CGA 580, 590 (3,000 psi @ 72° F) | 1/4 | NPT | 3 33/64" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 000000000 | 00000 |
| CGA 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | __ | 0000000 | 00000 |
| CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F) | 1/4 | NPT | 3 1/64" | Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon | __ | 0000000 | 00000 |
Chrome-Plated Brass—Tighten With Wrench | |||||||
| CGA 320 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Carbon Dioxide | __ | 000000000 | 00000 |
| CGA 326 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Nitrous Oxide | __ | 0000000 | 00000 |
| CGA 346 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Air | __ | 0000000 | 00000 |
| CGA 350 (3,000 psi @ 72° F) | 1/4 | NPT | 3" | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | __ | 000000000 | 00000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 0000000 | 00000 |
| CGA 500, 580, 590 (3,000 psi @ 72° F); CGA 510 (500 psi @ 72° F) | 1/4 | NPT | 3" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Medical Gas Mixtures, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 0000000 | 00000 |
| CGA 510 (500 psi @ 72° F); CGA 580, 590 (3,000 psi @ 72° F) | 1/4 | NPT | 3 1/2" | Acetylene, Argon, Butane, Cyclopropane, Dimethyl Ether, Ethylene Oxide, Helium, Isobutane, Krypton, Methane, Methyl Chloride, Natural Gas, Neon, Nitrogen, Propane, Propylene, Sulfur Hexafluoride, Vinyl Chloride, Vinyl Bromide, Xenon | __ | 000000000 | 00000 |
| CGA 540 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/16" | Oxygen | __ | 000000000 | 00000 |
| CGA 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | __ | 0000000 | 00000 |
| CGA 680, 695 (3,000 psi @ 72° F); CGA 702, 703 (4,700 psi @ 72° F) | 1/4 | __ | 3 1/64" | Air, Argon, Flammable Gases, Helium, Hydrogen, Krypton, Methane, Natural Gas, Neon, Nitrogen, Xenon | __ | 0000000 | 00000 |
316 Stainless Steel—Tighten With Wrench | |||||||
| CGA 670 (3,000 psi @ 72° F) | 1/4 | NPT | 2 17/64" | Oxygen Mixtures | __ | 000000000 | 00000 |
| CGA 677 (6,400 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | __ | 000000000 | 00000 |
| CGA 705 (3,000 psi @ 72° F) | 1/4 | NPT | 2 1/2" | Ammonia | __ | 000000000 | 00000 |
Nuts
Female Nut
Male Nut
- Maximum Pressure: See table
- Maximum Temperature: 120° F
| Number | Gender | Thread Size | Pipe Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| CGA 200 | Female | 0.628"-20 | __ | NGO | Right Hand | 500 psi @ 72° F | Acetylene | 000000000 | 00000 |
| CGA 280 | Female | 0.750"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 000000000 | 00000 |
| CGA 296 | Male | 0.803"-14 | __ | UNS | Right Hand | 3,000 psi @ 72° F | Oxygen Mixtures | 000000000 | 0000 |
| CGA 300 | Female | 0.830"-14 | __ | NGO | Right Hand | 500 psi @ 72° F | Ethyl Chloride | 000000000 | 0000 |
| CGA 320 | Female | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 0000 |
| CGA 326 | Female | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Nitrous Oxide | 000000000 | 0000 |
| CGA 330 | Female | 0.830"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Boron Trifluoride, Carbonyl Sulfide, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Iodide, Hydrogen Sulfide, Methyl Bromide, Silicon Tetrafluoride, Sulfur Tetrafluoride | 000000000 | 00000 |
| CGA 346 | Female | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Air | 000000000 | 0000 |
| CGA 347 | Female | 0.830"-14 | __ | NGO | Right Hand | 4,700 psi @ 72° F | Air | 000000000 | 00000 |
| CGA 350 | Female | 0.830"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | 000000000 | 0000 |
| CGA 410 | Female | 0.855"-14 | __ | NGO | Left Hand | 500 psi @ 72° F | Acetylene | 000000000 | 0000 |
| CGA 500 | Male | 0.880"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 000000000 | 00000 |
| CGA 510 | Male | 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 | 000000000 | 0000 |
| CGA 520 | Female | 0.899"-14 | __ | NGO | Right Hand | 500 psi @ 72° F | Acetylene | 000000000 | 0000 |
| CGA 540 | Female | 0.908"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Oxygen | 000000000 | 0000 |
| CGA 555 | Female | 0.908"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Butane, LP Gas | 000000000 | 0000 |
| CGA 580 | Male | 0.960"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 0000 |
| CGA 590 | Male | 0.960"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 000000000 | 0000 |
| CGA 660 | Female | 1.035"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Refrigerant Gases | 000000000 | 00000 |
| CGA 680 | Male | 1.040"-14 | __ | NGO | Right Hand | 4,700 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 701 | Female | 1.108"-14 | __ | NGO | Right Hand | 4,700 psi @ 72° F | Oxygen | 000000000 | 00000 |
| CGA 702 | Male | 1.120"-14 | __ | NGO | Right Hand | 6,400 psi @ 72° F | Air | 000000000 | 00000 |
Brass with Plastic Grip | |||||||||
| CGA 320 | Female | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 00000 |
| CGA 500 | Male | 0.880"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 00000000 | 00000 |
| CGA 510 | Male | 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 | 000000000 | 00000 |
| CGA 580 | Male | 0.960"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 590 | Male | 0.960"-14 | __ | UN/UNF (CGA) | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 00000000 | 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 | 00000 |
| 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 |
| BS 341 No. 3 | Male | __ | 5/8 | BSPT | Right Hand | 3,000 psi @ 72° F | Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane | 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 | 00000 |
| CGA 326 | Female | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Nitrous Oxide | 00000000 | 00000 |
| CGA 346 | Female | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Air | 00000000 | 00000 |
| CGA 350 | Female | 0.830"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | 000000000 | 00000 |
| CGA 510 | Male | 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 | 000000000 | 00000 |
| CGA 540 | Female | 0.908"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Oxygen | 000000000 | 00000 |
| CGA 580 | Male | 0.960"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 590 | Male | 0.960"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 000000000 | 00000 |
316 Stainless Steel | |||||||||
| CGA 670 | Female | 1.035"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Hydrogen Fluoride, Nitrogen Trifluoride, Tungsten Hexafluoride | 000000000 | 00000 |
| CGA 677 | Female | 1.035"-14 | __ | NGO | Left Hand | 6,400 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 705 | Female | 1.125"-14 | __ | UNS | Right Hand | 3,000 psi @ 72° F | Ammonia | 000000000 | 00000 |
Nuts for High-Pressure Nipples for Compressed Gas
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. 316 stainless steel nuts have excellent corrosion resistance.
Nuts with a plastic grip can be tightened by hand instead of with a wrench.
Nuts with left-hand threads are identified with a notch.
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.
Female
Female Nut
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F
| Number | Thread Size | Pipe Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | ||||||||
|---|---|---|---|---|---|---|---|---|
| CGA 200 | 0.628"-20 | __ | NGO | Right Hand | 500 psi @ 72° F | Acetylene | 000000000 | 00000 |
| CGA 280 | 0.750"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 000000000 | 00000 |
| CGA 300 | 0.830"-14 | __ | NGO | Right Hand | 500 psi @ 72° F | Ethyl Chloride | 000000000 | 0000 |
| CGA 320 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 0000 |
| CGA 326 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Nitrous Oxide | 000000000 | 0000 |
| CGA 330 | 0.830"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Boron Trifluoride, Carbonyl Sulfide, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Iodide, Hydrogen Sulfide, Methyl Bromide, Silicon Tetrafluoride, Sulfur Tetrafluoride | 000000000 | 00000 |
| CGA 346 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Air | 000000000 | 0000 |
| CGA 347 | 0.830"-14 | __ | NGO | Right Hand | 4,700 psi @ 72° F | Air | 000000000 | 00000 |
| CGA 350 | 0.830"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | 000000000 | 0000 |
| CGA 410 | 0.855"-14 | __ | NGO | Left Hand | 500 psi @ 72° F | Acetylene | 000000000 | 0000 |
| CGA 520 | 0.899"-14 | __ | NGO | Right Hand | 500 psi @ 72° F | Acetylene | 000000000 | 0000 |
| CGA 540 | 0.908"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Oxygen | 000000000 | 0000 |
| CGA 555 | 0.908"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Butane, LP Gas | 000000000 | 0000 |
| CGA 577 | 0.965"-14 | __ | NGO | Right Hand | 3,500 psi @ 72° F | Oxygen | 000000000 | 00000 |
| CGA 660 | 1.035"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Refrigerant Gases | 000000000 | 00000 |
| CGA 701 | 1.108"-14 | __ | NGO | Right Hand | 4,700 psi @ 72° F | Oxygen | 000000000 | 00000 |
| DIN 477 No. 9 | __ | 3/4 | BSPT | Right Hand | 4,300 psi @ 72° F | Oxygen | 000000000 | 00000 |
Brass with Plastic Grip | ||||||||
| CGA 320 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Carbon Dioxide | 000000000 | 00000 |
| CGA 346 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Air | 000000000 | 00000 |
| CGA 540 | 0.908"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Oxygen | 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 | 00000 |
| 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 | 00000 |
| CGA 326 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Nitrous Oxide | 00000000 | 00000 |
| CGA 346 | 0.830"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Air | 00000000 | 00000 |
| CGA 350 | 0.830"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Carbon Monoxide, Ethane, Ethylene, Hydrogen, Methane, Methyl Fluoride, Natural Gas | 000000000 | 00000 |
| CGA 540 | 0.908"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Oxygen | 000000000 | 00000 |
316 Stainless Steel | ||||||||
| CGA 670 | 1.035"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Hydrogen Fluoride, Nitrogen Trifluoride, Tungsten Hexafluoride | 000000000 | 00000 |
| CGA 677 | 1.035"-14 | __ | NGO | Left Hand | 6,400 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 705 | 1.125"-14 | __ | UNS | Right Hand | 3,000 psi @ 72° F | Ammonia | 000000000 | 00000 |
Male
Male Nut
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 12: 250° F
| Number | Thread Size | Pipe Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | ||||||||
|---|---|---|---|---|---|---|---|---|
| CGA 296 | 0.803"-14 | __ | UNS | Right Hand | 3,000 psi @ 72° F | Oxygen Mixtures | 000000000 | 00000 |
| CGA 500 | 0.880"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 000000000 | 00000 |
| CGA 510 | 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 | 000000000 | 0000 |
| CGA 580 | 0.960"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 0000 |
| CGA 590 | 0.960"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 000000000 | 0000 |
| CGA 680 | 1.040"-14 | __ | NGO | Right Hand | 4,700 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 702 | 1.120"-14 | __ | NGO | Right Hand | 6,400 psi @ 72° F | Air | 000000000 | 00000 |
| DIN 477 No. 12 | __ | 3/4 | BSPT | Right Hand | 4,300 psi @ 72° F | Nitrous Oxide | 000000000 | 00000 |
Brass with Plastic Grip | ||||||||
| CGA 510 | 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 | 000000000 | 00000 |
| CGA 580 | 0.960"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 590 | 0.960"-14 | __ | UN/UNF (CGA) | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 00000000 | 00000 |
Aluminum-Plated Brass | ||||||||
| BS 341 No. 3 | __ | 5/8 | BSPT | Right Hand | 3,000 psi @ 72° F | Air, Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Perfluoropropane | 000000000 | 00000 |
Chrome-Plated Brass | ||||||||
| CGA 510 | 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 | 000000000 | 00000 |
| CGA 580 | 0.960"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| CGA 590 | 0.960"-14 | __ | NGO | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 000000000 | 00000 |
Chrome-Plated Brass with Plastic Grip | ||||||||
| CGA 500 | 0.880"-14 | __ | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 00000000 | 00000 |
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.
Female Tank × Male Regulator
- Maximum Pressure: See table
- Maximum Temperature: 120° F
CGA Number | Tank Connection | Regulator Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tank | Regulator | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||||||
| 200 | 300 | 0.628"-14 | NGO | Right Hand | 0.830"-14 | NGO | Right Hand | 500 psi @ 72° F | Acetylene, Ethyl Chloride | 0000000 | 000000 |
| 200 | 520 | 0.628"-14 | NGO | Right Hand | 0.899"-14 | NGO | Right Hand | 500 psi @ 72° F | Acetylene | 0000000 | 00000 |
| 346 | 540 | 0.830"-14 | NGO | Right Hand | 0.908"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Air, Oxygen | 0000000 | 00000 |
| 520 | 200 | 0.899"-14 | NGO | Right Hand | 0.628"-14 | NGO | Right Hand | 500 psi @ 72° F | Acetylene | 0000000 | 00000 |
Male Tank × Male Regulator
- Maximum Pressure: See table
- Maximum Temperature: 120° F
CGA Number | Tank Connection | Regulator Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 580 | 320 | 0.960"-14 | NGO | Right Hand | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Carbon Dioxide, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 00000 |
| 580 | 346 | 0.960"-14 | NGO | Right Hand | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Air, Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 00000 |
| 580 | 350 | 0.960"-14 | NGO | Right Hand | 0.830"-14 | NGO | Left Hand | 3,000 psi @ 72° F | Argon, Carbon Monoxide, Ethane, Ethylene, Helium, Hydrogen, Krypton, Methane, Methyl Fluoride, Natural Gas, Neon, Nitrogen, Xenon | 0000000 | 00000 |
| 580 | 540 | 0.960"-14 | NGO | Right Hand | 0.908"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Xenon | 0000000 | 00000 |
| 580 | 555 | 0.960"-14 | NGO | Right Hand | 0.908"-14 | NGO | Left Hand | 3,000 psi @ 72° F | Argon, Butane, Helium, Krypton, LP Gas, Neon, Nitrogen, Xenon | 0000000 | 00000 |
| 590 | 346 | 0.960"-14 | NGO | Left Hand | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Air, Sulfur Hexafluoride | 0000000 | 00000 |