About Metal Tubing
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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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Air Conditioning Hose
- Temperature Range: -20° to 180° F
- Material: Kevlar with Buna-N Rubber Cover
- Color: Black, Blue, Red, or Yellow
Use hose to charge and test your air conditioning units.
| Thread Size | ID | OD | Max. Pressure | Choose a Color | Each | |
3-ft. Lengths | ||||||
|---|---|---|---|---|---|---|
Brass Threaded UNF Female × Brass Threaded UNF Female | ||||||
| 5/8"-18 × 5/8"-18 | 5/16" | 5/8" | 600 psi @ 72° F | Black | 0000000 | 000000 |
Brass Threaded UNF Female × Brass 45° Flared UNF Female | ||||||
| 7/16"-20 × 7/16"-20 | 3/16" | 1/2" | 800 psi @ 72° F | 000000 | 00000 | |
5-ft. Lengths | ||||||
Brass Threaded UNF Female × Brass 45° Flared UNF Female | ||||||
| 7/16"-20 × 7/16"-20 | 3/16" | 1/2" | 800 psi @ 72° F | 000000 | 00000 | |
6-ft. Lengths | ||||||
Brass Threaded UNF Female × Brass Threaded UNF Female | ||||||
| 5/8"-18 × 5/8"-18 | 5/16" | 5/8" | 600 psi @ 72° F | Black | 0000000 | 00000 |
Brass Threaded UNF Female × Brass 45° Flared UNF Female | ||||||
| 7/16"-20 × 7/16"-20 | 3/16" | 1/2" | 800 psi @ 72° F | 000000 | 00000 | |
Brass Threaded UNF Female × Brass 45° Flared Ball Valve UNF Female | ||||||
| 7/16"-20 × 7/16"-20 | 3/16" | 1/2" | 800 psi @ 72° F | 0000000 | 00000 | |
Air Conditioning Hose Sets
- Temperature Range: -20° to 180° F
- Material: Kevlar with Buna-N Rubber Cover
- Color: Blue, Red, and Yellow
Each hose is a different color so you can differentiate your lines.
3-ft. Lengths | 5-ft. Lengths | 6-ft. Lengths | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size | ID | OD | Max. Pressure | Each | Each | Each | |||
Brass Threaded UNF Female × Brass 45° Flared UNF Female | |||||||||
| 7/16"-20 × 7/16"-20 | 3/16" | 1/2" | 800 psi @ 72° F | 0000000 | 000000 | 0000000 | 000000 | 0000000 | 000000 |
Brass Threaded UNF Female × Brass 45° Flared Ball Valve UNF Female | |||||||||
| 7/16"-20 × 7/16"-20 | 3/16" | 1/2" | 800 psi @ 72° F | 000000 | 00 | 000000 | 00 | 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.
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 | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| CGA 660 | 1.035"-14 | NGO | Right Hand | 3,000 psi @ 72° F | Refrigerant Gases | 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 702 | 1.120"-14 | NGO | Right Hand | 6,400 psi @ 72° F | Air | 000000000 | 000000 |
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 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | 000000000 | 000000 |
Brass—Tighten By Hand | ||||||
| CGA 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | 0000000 | 00000 |
Chrome-Plated Brass—Tighten With Wrench | ||||||
| CGA 660 (3,000 psi @ 72° F) | 1/4 | NPT | 1 3/4" | Refrigerant Gases | 0000000 | 00000 |
- Maximum Pressure: See table
- Maximum Temperature: 120° F
Cleaned and Capped Copper Tubing
- Temperature Range: 32° to 400° F
- Bending Method: Tube Bender
- Compatible Tube Fittings: Compression and Solder Connect
This tubing comes cleaned and capped to prevent moisture and dirt from contaminating the inside. It is also known as refrigeration and air conditioning tubing. Tubing has good corrosion resistance and excellent heat transfer qualities. It is seamless, which provides a smooth interior for unrestricted flow. It can be flared without splitting.
Note: Copper tube size is an accepted industry designation, not an actual size.
For technical drawings and 3-D models, click on a part number.
| Copper Tube Size | OD | Wall Thick. | ID | Max. Pressure | Temper Rating | 50 ft. | 100 ft. | |
For Use With Natural Gas, Oil, R22 Refrigerant, Water | ||||||||
|---|---|---|---|---|---|---|---|---|
| __ | 1/8" | 0.03" | 0.065" | 3,000 psi @ 72° F | Soft | 000000 | ||
| __ | 3/16" | 0.03" | 0.128" | 1,900 psi @ 72° F | Soft | 000000 | ||
| __ | 1/4" | 0.03" | 0.19" | 1,400 psi @ 72° F | Soft | 0000000 | ||
| __ | 5/16" | 0.032" | 0.248" | 1,100 psi @ 72° F | Soft | 0000000 | ||
| 1/4 | 3/8" | 0.032" | 0.311" | 980 psi @ 72° F | Soft | 0000000 | ||
| 3/8 | 1/2" | 0.032" | 0.436" | 720 psi @ 72° F | Soft | 0000000 | ||
| 1/2 | 5/8" | 0.035" | 0.555" | 610 psi @ 72° F | Soft | 0000000 | ||
| 5/8 | 3/4" | 0.035" | 0.68" | 510 psi @ 72° F | Soft | 0000000 | ||
| 3/4 | 7/8" | 0.045" | 0.785" | 580 psi @ 72° F | Soft | 0000000 | ||
| 1 | 1 1/8" | 0.05" | 1.025" | 490 psi @ 72° F | Soft | 0000000 | ||
| 1 1/4 | 1 3/8" | 0.055" | 1.265" | 430 psi @ 72° F | Soft | 0000000 | ||
| 1 1/2 | 1 5/8" | 0.06" | 1.505" | 400 psi @ 72° F | Soft | 0000000 | ||
Insulated Copper Tubing
- Temperature Range: -290° to 220° F
- Bending Method: Tube Bender
- Compatible Tube Fittings: Compression and Solder Connect
Often used in heating and cooling systems, this tubing insulates refrigerant to efficiently transfer heat between components. It's frequently referred to as refrigeration and air conditioning tubing. This tubing consists of a copper tube insulated in rubber. The copper tubing resists corrosion and has excellent heat transfer qualities. The outer insulation has a closed-cell design, so it prevents moisture from seeping through and corroding the copper tubing. This tubing is generally rigid because of the copper tubing inside and is stronger than plastic and rubber tubing. Use it in medium- to high-pressure applications.
For technical drawings and 3-D models, click on a part number.
50 ft. | ||||||||
|---|---|---|---|---|---|---|---|---|
| Copper Tube Size | OD | Wall Thick. | ID | Max. Pressure | Temper Rating | Specifications Met | Each | |
| 1/4 | 3/8" | 0.025" | 0.35" | 4,220 psi @ 72° F | Soft | ASTM B743, ASTM C534, ASTM E84 25/50 for Flame and Smoke, ASTM E96 | 0000000 | 0000000 |
| 3/8 | 1/2" | 0.028" | 0.472" | 3,120 psi @ 72° F | Soft | ASTM B743, ASTM C534, ASTM E84 25/50 for Flame and Smoke, ASTM E96 | 0000000 | 000000 |
| 1/2 | 5/8" | 0.03" | 0.595" | 2,580 psi @ 72° F | Soft | ASTM B743, ASTM C534, ASTM E84 25/50 for Flame and Smoke, ASTM E96 | 0000000 | 000000 |
Precision Steel Tubing
- Temperature Range: -40° to 250° F
- Bending Method: Tube Bender
- Compatible Tube Fittings: Compression
With the lowest OD tolerance of all our steel tubing, this tubing is designed for precision applications. Also known as Bundyweld tubing, it is plated with copper and rolled into a tube, then the copper is melted to form a strong cohesive bond. For added corrosion resistance, tubing is finished with a coat of aluminum-based paint or zinc.
For technical drawings and 3-D models, click on a part number.
25 ft. | |||||||
|---|---|---|---|---|---|---|---|
| OD | OD Tolerance | Wall Thick. | ID | Max. Pressure | Temper Rating | Each | |
Painted Steel | |||||||
For Use With Hydraulic Fluid and R22 Refrigerant | |||||||
| 3/16" | -0.003" to 0.003" | 0.028" | 0.132" | 3,600 psi @ 72° F | Soft | 0000000 | 000000 |
| 1/4" | -0.003" to 0.003" | 0.028" | 0.194" | 2,600 psi @ 72° F | Soft | 0000000 | 00000 |
Zinc-Plated Steel | |||||||
For Use With Hydraulic Fluid and R22 Refrigerant | |||||||
| 5/16" | -0.003" to 0.003" | 0.028" | 0.257" | 2,100 psi @ 72° F | Soft | 0000000 | 00000 |
| 3/8" | -0.003" to 0.003" | 0.028" | 0.319" | 1,600 psi @ 72° F | Soft | 0000000 | 00000 |