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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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About Nuts, Materials, and Finishes
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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.
- 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 |
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. 316 stainless steel nuts have excellent corrosion resistance.
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.
- 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 | |
316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| CGA 705 | 1.125"-14 | UNS | Right Hand | 3,000 psi @ 72° F | Ammonia | 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 296 | 0.803"-14 | UNS | Right Hand | 3,000 psi @ 72° F | Oxygen Mixtures | 000000000 | 00000 |
Plastic Push-to-Connect Tube Fittings for Chemicals
- For Use With: Inch: Acetic Acid, Alcohol, Arsenic Acid, Benzoic Acid, Fluoboric Acid, Hydrochloric Acid, Nitric Acid, Sodium Carbonate, Sulfuric Acid
Metric: Acetic Acid, Alcohol, Arsenic Acid, Benzoic Acid, Fluoboric Acid, Sodium Carbonate, Sulfuric Acid - Temperature Range: Inch: 0° to 270° F
Metric: 32° to 175° F - Tubing: Use with hard (Durometer 55D-60D) FEP plastic
Also known as instant fittings, these chemical-resistant plastic fittings connect to tubing with a push, and an internal gripping ring and fluoroelastomer O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting.
PVDF fittings offer excellent chemical resistance, and can be used with hydrochloric acid and nitric acid. They withstand temperatures up to 270° F, higher than other push-to-connect fittings for chemicals. They are produced in a clean room and are bagged individually to prevent dirt and moisture from contaminating the inside. PVDF is also known as Kynar.
Fittings with UNS threads are also known as faucet connectors; they attach directly to a faucet threaded inlet or water line.
For technical drawings and 3-D models, click on a part number.
Push-to-Connect Fittings for Plastic
Tubing—Food and Beverage
- Temperature Range: 35° to 140° F
- Tubing: Use with hard (Durometer 50D-70D) nylon or polyethylene plastic
- Specifications Met: Made of FDA Listed Materials; white fittings also meet NSF/ANSI Standard 51 for Food Contact
Also known as instant fittings, these connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings are polypropylene for excellent impact and abrasion resistance.
Black fittings have excellent UV resistance and are suitable for outdoor environments.
Fittings with UNS threads are also known as faucet connectors; they attach directly to a faucet threaded inlet or water line.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Thread Size | Material | Max. Pressure | Release Ring Color | Each | |
White | ||||||
|---|---|---|---|---|---|---|
UNS Threads | ||||||
| 1/4" | 7/16"-24 | Polypropylene Plastic | 150 psi @ 72° F | White | 0000000 | 00000 |
| 3/8" | 7/16"-24 | Polypropylene Plastic | 150 psi @ 72° F | White | 0000000 | 0000 |
Black | ||||||
UNS Threads | ||||||
| 1/4" | 7/16"-24 | Polypropylene Plastic | 150 psi @ 72° F | Black | 00000000 | 0000 |
| 3/8" | 7/16"-24 | Polypropylene Plastic | 150 psi @ 72° F | Black | 00000000 | 0000 |
Low-Strength Steel Coupling Nuts
Also known as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
Zinc-plated steel coupling nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Zinc-Plated Steel | |||||
| 1"-14 | 2 3/4" | 1 3/8" | 000000000 | 000000 | 000000 |
Medium-Strength Steel Coupling Nuts—Grade 5
Also known as extension nuts, use these to connect and extend threaded rods.
Zinc-plated steel coupling nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Zinc-Plated Steel—Grade 5 | |||||
| 1"-14 | 2 3/4" | 1 3/8" | 000000000 | 000000 | 000000 |
High-Strength Steel Coupling Nuts—Grade 8
Also known as extension nuts, use these to connect and extend threaded rods. Made from Grade 8 steel, they're about 25% stronger than medium-strength steel coupling nuts. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Zinc-Plated Steel—Grade 8 | |||||
| 1"-14 | 2 3/4" | 1 1/2" | 000000000 | 000000 | 000000 |