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 D.O.T. Push-to-Connect Tube Fittings for Air
- Temperature Range: -40° to 210° F
- Tubing: Use with hard (Durometer 65D) nylon plastic
- Specifications Met: D.O.T. FMVSS 571, SAE J1131, SAE J2494-1, SAE J2494-3
except Identification Rings: D.O.T. FMVSS 571
Connect air brake lines with fittings that won’t crack in sub-zero temperatures. They meet Department of Transportation FMVSS 571 safety standards, so they’re often used in commercial trucks and trailers. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. Fittings have a built-in tube support that slips inside the tubing to prevent it from collapsing. To disconnect, push on the release ring and pull the tubing out of the fitting. They have good corrosion resistance. Use them at up to 150 psi and attach them to hard tubing.
NPTF (Dryseal) threads are compatible with NPT threads. The male threads have an acrylic sealant applied to protect against leaks.
| For Tube OD | Pipe Size | Thread Size | Material | Max. Pressure | Features | Each | |
NPTF Threads | |||||||
|---|---|---|---|---|---|---|---|
| 5/32" | 1/8 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K118 | 00000 |
| 1/4" | 1/8 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K11 | 0000 |
| 1/4" | 1/4 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K12 | 0000 |
| 3/8" | 1/4 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K13 | 0000 |
| 3/8" | 3/8 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K14 | 0000 |
| 1/2" | 3/8 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K201 | 0000 |
| 1/2" | 1/2 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K15 | 00000 |
| 3/4" | 3/4 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K124 | 00000 |
| 6mm | 1/8 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K25 | 0000 |
| 6mm | 1/4 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K251 | 0000 |
| 8mm | 3/8 | __ | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K254 | 0000 |
Metric Threads | |||||||
| 6mm | __ | M12 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K258 | 00000 |
| 8mm | __ | M12 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K261 | 00000 |
| 10mm | __ | M12 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K264 | 00000 |
| 12mm | __ | M16 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K268 | 00000 |
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
| For Tube OD | Pipe Size | Material | Max. Pressure | Features | Each | |
NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 5/32" | 1/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K125 | 00000 |
| 1/4" | 1/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K31 | 0000 |
| 1/4" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K32 | 0000 |
| 3/8" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K33 | 0000 |
| 3/8" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K34 | 00000 |
| 1/2" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K203 | 00000 |
| 1/2" | 1/2 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K35 | 00000 |
| 3/4" | 3/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K126 | 00000 |
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
| For Tube OD | Pipe Size | Material | Max. Pressure | Features | Each | |
NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 1/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K61 | 00000 |
| 1/4" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K62 | 0000 |
| 3/8" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K63 | 00000 |
| 3/8" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K64 | 00000 |
| 1/2" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K65 | 00000 |
| 1/2" | 1/2 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K202 | 00000 |
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
Inline tees are also known as branch tees.
| For Tube OD | Pipe Size | Material | Max. Pressure | Features | Each | |
NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 1/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K71 | 000000 |
| 1/4" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K72 | 00000 |
| 3/8" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K73 | 00000 |
| 3/8" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K74 | 00000 |
| 1/2" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K75 | 00000 |
| 1/2" | 1/2 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K204 | 00000 |
Fittings with intermittent swivel rotate 360° before and after installation as needed to allow movement in the system and to prevent kinking.
Right-angle tees are also known as run tees.
| For Tube OD | Pipe Size | Material | Max. Pressure | Features | Each | |
NPTF Threads | ||||||
|---|---|---|---|---|---|---|
| 1/4" | 1/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K81 | 000000 |
| 1/4" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K82 | 00000 |
| 3/8" | 1/4 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K83 | 00000 |
| 3/8" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K84 | 00000 |
| 1/2" | 3/8 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K85 | 00000 |
| 1/2" | 1/2 | Brass | 150 psi @ 72° F | Acrylic Thread Sealant | 51915K205 | 00000 |
| For Tube OD | Material | Max. Pressure | Each | |
| 1/4" | Brass | 150 psi @ 72° F | 51915K91 | 000000 |
| 3/8" | Brass | 150 psi @ 72° F | 51915K92 | 00000 |
| 1/2" | Brass | 150 psi @ 72° F | 51915K93 | 00000 |
| 3/4" | Brass | 150 psi @ 72° F | 51915K116 | 00000 |
| 6mm | Brass | 150 psi @ 72° F | 51915K246 | 00000 |
| 8mm | Brass | 150 psi @ 72° F | 51915K247 | 00000 |
| 10mm | Brass | 150 psi @ 72° F | 51915K248 | 00000 |
| 12mm | Brass | 150 psi @ 72° F | 51915K249 | 00000 |
Color-code your lines by snapping one of these rings over the release ring on low-temperature D.O.T. push-to-connect tube fittings. Often used in air brake lines for commercial trucks and trailers, they meet Department of Transportation FMVSS 571 safety standards.