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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Push-to-Connect Tube Fittings for Air
- Temperature Range: 0° to 170° F, except polybutylene plastic fittings are 32° to 140° F
- Tubing: Use with firm (Durometer 95A-45D) polyethylene plastic or polyurethane rubber
- Specifications Met: ISO 14743, except cartridges and polybutylene plastic fittings
Insert tubing into these fittings and an internal gripping ring and O-ring hold the tubing tight. They are also known as instant fittings. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings have good corrosion resistance. Use them in low-pressure applications.
Identification rings (sold separately) snap over the release ring so you can color-code your lines.
Clips (sold separately) align and organize your tubing and fittings.
Fittings with PTFE thread sealant offer extra protection against leaks.
Metric male threads have either a gasket or a thread sealant to protect against leaks. BSPP and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
Fittings with external hex or slotted drive allow for easy adjustments in tight spaces; they are also known as banjo-style fittings.
| For Tube OD | Pipe Size  | Thread Size | Material | Gasket Material | Color | Release Ring Color | Max. Pressure | Drive Size | Features | Each | |
NPT Threads | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5/32" | 1/8 | __ | Nylon Plastic | __ | Black | Black | 290 psi @ 72° F | 33/64" | PTFE Thread Sealant | 00000000 | 000000 |
| 1/4" | 1/8 | __ | Nylon Plastic | __ | Black | Black | 290 psi @ 72° F | 33/64" | PTFE Thread Sealant | 00000000 | 00000 |
| 1/4" | 1/4 | __ | Nylon Plastic | __ | Black | Black | 290 psi @ 72° F | 43/64" | PTFE Thread Sealant | 00000000 | 00000 |
| 3/8" | 1/4 | __ | Nylon Plastic | __ | Black | Black | 290 psi @ 72° F | 53/64" | PTFE Thread Sealant | 00000000 | 00000 |
| 3/8" | 3/8 | __ | Nylon Plastic | __ | Black | Black | 290 psi @ 72° F | 53/64" | PTFE Thread Sealant | 00000000 | 00000 |
BSPP Threads | |||||||||||
| 4mm | 1/8 | __ | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 13mm | __ | 00000000 | 00000 |
| 6mm | 1/8 | __ | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 13mm | __ | 00000000 | 00000 |
| 6mm | 1/4 | __ | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 17mm | __ | 00000000 | 00000 |
| 8mm | 1/4 | __ | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 17mm | __ | 00000000 | 00000 |
| 8mm | 3/8 | __ | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 20mm | __ | 00000000 | 00000 |
| 10mm | 3/8 | __ | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 20mm | __ | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||||||
| 5/32" | __ | 10-32 | Nylon Plastic | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 15/64" | __ | 00000000 | 00000 |
Fittings with external hex or slotted drive allow for easy adjustments in tight spaces; they are also known as banjo-style fittings.
| For Tube OD | Thread Size | Thread Pitch, mm | Tube Connection Material | Pipe Connection Material | Gasket Material | Color | Release Ring Color | Max. Pressure | Each | |
Metric Threads | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 4mm | M5 | 0.8 | Nylon Plastic | Nickel-Plated Brass | Buna-N Rubber | Black | Black | 290 psi @ 72° F | 00000000 | 00000 |
