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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Low-Temperature/High-Pressure D.O.T.
Push-to-Connect Tube Fittings for Air
- Temperature Range: -40° to 200° F
- Tubing: Use with hard (Durometer 65D) nylon plastic
- Specifications Met:
Cartridges: D.O.T. FMVSS 571, SAE J2494-4, SAE J1131
All other fittings: D.O.T. FMVSS 571
Connect high-pressure brake lines with fittings that won’t crack in frigid temperatures. Often used on commercial trucks and trailers, these fittings meet Department of Transportation FMVSS 571 safety standards. Also known as instant fittings, they connect to tubing with a simple push, and an internal gripping ring and O-ring will hold the tubing tight. A built-in tube support slips inside the tubing to prevent it from collapsing. To disconnect, push on the release ring and pull the tubing out of the fitting. All have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Straight cartridge fittings create a push-to-connect junction between equipment and tubing in your system. They’re designed to be used in unthreaded 6061 aluminum ports. If you want to use them in a different material, you may need to adjust the hole size for optimum performance. To install them, create a hole in your surface and push the fitting’s components into place before inserting the tubing until it’s flush against the tube stop.
Required Hole | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Tube OD | Material | Max. Pressure | Dia. | Dp. | Hole Dia. Tolerance | Min. Plate Thick. | Each | |
| 1/4" | Brass | 250 psi @ 72° F | 0.504" | 0.5" | -0.002" to 0.002" | 0.5" | 00000000 | 000000 |
| 1/4" | Brass | 250 psi @ 72° F | 0.775" | 0.78" | -0.002" to 0.002" | 0.78" | 00000000 | 00000 |
| 3/8" | Brass | 250 psi @ 72° F | 0.65" | 0.65" | -0.002" to 0.002" | 0.65" | 00000000 | 00000 |
| 3/8" | Brass | 250 psi @ 72° F | 0.775" | 0.78" | -0.002" to 0.002" | 0.78" | 00000000 | 00000 |
| 1/2" | Brass | 250 psi @ 72° F | 0.775" | 0.78" | -0.002" to 0.002" | 0.78" | 00000000 | 00000 |