How to Identify and Measure Fittings
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Vibration-Resistant Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing
- For Use With: Carbon Dioxide, Ammonia, Chloride, Fluoride, Fluorine, Germane, Fluorocarbon, Halide, Helium, Hydrogen, Argon, Krypton, Oxygen, Laser Gas, Natural Gas, Neon, Butane, Xenon, Tungsten Hexafluoride, Silane, Sulfur Hexafluoride, Nitrogen
- Temperature Range: -420° to 1000° F, except nickel gaskets are -325° to 600° F
- Tubing: Use with 316/316L stainless steel
- Specifications Met: MIL-STD-810
Use these fittings in applications ranging from semiconductor manufacturing to satellites and rockets. They resist high vibration and vacuum while maintaining high purity. Two anti-torque rings stop the fittings from twisting your tubing or component during installation. This also prevents the fittings from loosening or leaking from high vibration, so they’re safe to use with hazardous gases. All are compatible with Swagelok® VCR fittings.
Also known as ultra-high-purity fittings, these fittings were packed in a Class 100 clean room, so they arrive without contaminants. They're also designed from inside and out to prevent the creation of contaminants. Made of stainless steel, they won’t rust. Their anti-torque rings prevent galling, which extends the life of the seal while limiting particles. A metal gasket, instead of a rubber one, also reduces the potential for particles. And their interior is polished to a 7 Ra finish—the same as a high-quality stainless steel sink—to prevent particles from clinging to the inside.
Choose from fully assembled fittings or build a custom fitting. For a complete fitting, you'll need two anti-torque rings, two adapters, a male and female nut, and a gasket.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Wall Thickness | Lg. | Material | Gasket Material | Max. Pressure | Max. Vacuum | Includes | Each | |
| 1/4" | 0.035" | 1 13/16" | 316/316L Stainless Steel | Nickel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | Two Adapters, Two Anti-Torque Rings, Gasket, Male Nut, Female Nut | 0000000 | 000000 |
| 1/2" | 0.049" | 2 15/16" | 316/316L Stainless Steel | Nickel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | Two Adapters, Two Anti-Torque Rings, Gasket, Male Nut, Female Nut | 0000000 | 000000 |
These adapters are also known as glands.
| For Tube OD | Wall Thick. | Lg. | Material | Max. Pressure | Max. Vacuum | Each | |
| 1/4" | 0.035" | 1 1/8" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 000000 |
| 1/4" | 0.035" | 1 3/4" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| 1/2" | 0.049" | 1 1/8" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| 1/2" | 0.049" | 1 13/16" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Max. Vacuum | Each | |
Male | |||||
|---|---|---|---|---|---|
| 1/4" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
| 1/2" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
Female | |||||
| 1/4" | 316/316L Stainless Steel | 4,000 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 0000 |
| 1/2" | 316/316L Stainless Steel | 2,800 psi @ 72° F | 10 -11 torr @ 72° F | 0000000 | 00000 |
Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they don’t withstand temperatures as high. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.
Stainless steel gaskets are a more universal gasket material than nickel gaskets. They’re also stronger and better at handling high temperatures. You can use them with carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.
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.
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.
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F
| Number | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Aluminum-Plated Brass | |||||||
|---|---|---|---|---|---|---|---|
| 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 | 000000 |
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 12: 250° F
| Number | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| CGA 500 | 0.880"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 000000000 | 000000 |
| 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 |
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 |
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.
- 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 | |||||||||||
| 590 | 346 | 0.960"-14 | NGO | Left Hand | 0.830"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Air, Sulfur Hexafluoride | 0000000 | 000000 |
- Maximum Pressure: 3,000 psi @ 72° F
- Maximum Temperature: 120° F
CGA Number | Tank Connection | Regulator Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Tank | Regulator | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 296 | 590 | 0.803"-14 | UNS | Right Hand | 0.960"-14 | NGO | Left Hand | Oxygen Mixtures, Sulfur Hexafluoride | 0000000 | 000000 |
| 580 | 590 | 0.960"-14 | NGO | Right Hand | 0.960"-14 | NGO | Left Hand | Argon, Helium, Krypton, Neon, Nitrogen, Sulfur Hexafluoride, Xenon | 0000000 | 00000 |
| 590 | 580 | 0.960"-14 | NGO | Left Hand | 0.960"-14 | NGO | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Sulfur Hexafluoride, Xenon | 0000000 | 00000 |
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.
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.
- Maximum Pressure: See table
- Maximum Temperature: 120° F
Regulator Connection | ||||||
|---|---|---|---|---|---|---|
| For Number (Max. Pressure) | Pipe Size | Thread Type | Lg. | For Use With | Each | |
Brass—Tighten With Wrench | ||||||
| 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 | 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 | 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 |
| 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 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 |
Chrome-Plated Brass—Tighten With Wrench | ||||||
| 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 |
- Maximum Pressure: See table
- Maximum Temperature: 120° F
| Number | Gender | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass | ||||||||
|---|---|---|---|---|---|---|---|---|
| CGA 500 | Male | 0.880"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Medical Gas Mixtures | 000000000 | 000000 |
| 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 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 |
Brass with Plastic Grip | ||||||||
| 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 | ||||||||
| 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 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 | NGO | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 000000000 | 00000 |