Pneumatic Fittings

Pneumatic fittings are the essential connectors used to join sections of pipe, tube, and hose in pressurized gas systems. Compared to hydraulic fittings, they typically require tighter seals and lower pressure ratings.

Common Types of Fittings
The "best" fitting depends on how often you need to change the connection and the pressure of the system.
Push-to-Connect: The most popular choice for modern industrial automation. You simply push the tube into the fitting, and internal "teeth" (a collet) grab it. It’s fast and requires no tools.
Compression Fittings: Use a metal ring (ferrule) that is tightened down by a nut to create a seal. These are better for higher-pressure applications where a plastic push-in might fail.
Threaded Fittings: These have standard screw threads (like NPT or BSP). They are used to connect components like valves or cylinders to the main air line.
Barb Fittings: A plastic or metal "barb" slides inside a flexible hose. A hose clamp is usually required to keep it secure.
Important Considerations
Thread Standards: Make sure you aren't mixing NPT (tapered) with Metric/G (parallel) threads, as they won't seal properly and can damage the equipment.
Pressure Rating: Standard pneumatic systems run between 0 to 150 PSI. Ensure your fitting is rated for at least 20% more than your max system pressure.
Tubing Compatibility: Always match the outside diameter (OD) of your tube to the fitting. For push-to-connect, the tube must have a clean, square cut to prevent leaks.