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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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Vibration-Resistant Compression Fittings for Stainless Steel Tubing
- For Use With: Acetylene, Air, Butane, Compressed Air, Cutting Oil, Diesel Fuel, Fuel Oil, Gasoline, Helium, Hydraulic Fluid (Petroleum Base), Kerosene, Mineral Oil, Natural Gas, Nitrogen, Propane, Soap Solutions
- Temperature Range: -10° to 400° F
- Tubing: Use with seamless 316Ti or 321 stainless steel
- Specifications Met: DIN 3861
Instead of a metal sleeve (ferrule), these fittings have a rubber sleeve that cushions tubing and absorbs vibration to maintain a tight seal, even when connected to large pumps. However, rubber sleeves can’t withstand temperatures as high as metal ones. To create the strong seal, tighten the included nut. These fittings are made of 316 stainless steel, so they have excellent corrosion resistance. They’re also known as flareless fittings. All meet DIN 3861, which is an international standard for compression tube fitting specifications.
BSPP and metric male threads have a gasket to prevent leaks.
For technical drawings and 3-D models, click on a part number.
Straight Adapters, Tube × Male Threaded Pipe
Straight Adapters, Tube × Male Threaded Pipe
BSPP and Metric
Male Threads with
Gasket and Washer
Male Threads with
Gasket and Washer
For Tube | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| OD, mm | Wall Thickness, mm | Pipe Size  | Thread Size | Thread Pitch, mm | Material | Gasket Material | Maximum Pressure | Each | |
NPT Threads | |||||||||
| 6 | 1 | 1/8 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
| 6 | 1 | 1/4 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 00000 |
| 8 | 1 | 1/4 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 00000 |
| 10 | 1 | 1/4 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
| 10 | 1 | 3/8 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
| 12 | 1.5 | 1/4 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
| 12 | 1.5 | 1/2 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
| 15 | 1.5 | 1/2 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
| 18 | 2 | 1/2 | __ | __ | 316 Stainless Steel | __ | 4,500 psi @ 72° F | 00000000 | 000000 |
BSPP Threads | |||||||||
| 6 | 1 | 1/8 | __ | __ | 316 Stainless Steel | Fluoroelastomer Rubber | 4,500 psi @ 72° F | 00000000 | 00000 |
| 6 | 1 | 1/4 | __ | __ | 316 Stainless Steel | Fluoroelastomer Rubber | 4,500 psi @ 72° F | 00000000 | 00000 |
Metric Threads | |||||||||
| 8 | 1 | __ | M12 | 1.5 | 316 Stainless Steel | Fluoroelastomer Rubber | 4,500 psi @ 72° F | 00000000 | 000000 |
| 10 | 1 | __ | M14 | 1.5 | 316 Stainless Steel | Fluoroelastomer Rubber | 4,500 psi @ 72° F | 00000000 | 00000 |
Nuts
Nut
For Tube | |||||
|---|---|---|---|---|---|
| OD, mm | Wall Thickness, mm | Nut Material | Maximum Pressure | Each | |
| 6 | 1 | 316 Stainless Steel | 4,500 psi @ 72° F | 00000000 | 000000 |
| 8 | 1 | 316 Stainless Steel | 4,500 psi @ 72° F | 00000000 | 00000 |
| 10 | 1 | 316 Stainless Steel | 4,500 psi @ 72° F | 00000000 | 00000 |
| 12 | 1.5 | 316 Stainless Steel | 4,500 psi @ 72° F | 00000000 | 00000 |
| 15 | 1.5 | 316 Stainless Steel | 4,500 psi @ 72° F | 00000000 | 00000 |
| 18 | 2 | 316 Stainless Steel | 4,500 psi @ 72° F | 00000000 | 00000 |
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 |
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.
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 | Each | |
Brass—Tighten With Wrench | ||||||
| CGA 200 (500 psi @ 72° F) | 1/8 | NPT | 1 1/4" | Acetylene | 000000000 | 00000 |
| 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 |
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 |
Nuts
Female Nut
Male Nut
- Maximum Pressure: See table
- Maximum Temperature: 120° F
| Number | Gender | Thread 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 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 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 |
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 |