When shopping for connectors and adaptors for this type of system, you will be presented with numerous options covering a wide variety of different assembly methods and styles. Some of the most common include:
Push-In Pneumatic Fittings
This type is designed with speed and ease of assembly/disassembly in mind, but they are also built to provide a secure and reliable join. They typically enable entirely tool-free connection and disconnection between various tubes, pipes and tools; ideal for fittings that will frequently need to be reassembled.
The most common type of push-in fitting features a collet or ‘grab ring’ around the connection point, through which the hose or pipe slides and which then automatically grips and holds the tubing in place. Pushing down on the collet with two fingers (or a quick-release tool) instantly disconnects the fitting from the tubing.
Push-in fittings can be made from plastic or various metals. Plastics are typically used for lower pressure systems whereas metal fittings may be required in higher-temperature applications or environments.
Tube-to-Tube Pneumatic Fittings
Tube-to-tube adaptors are available in a variety of diameters, sizes, and materials. They are used to connect two lengths of tubing together, either straight or at an angle, and different types can be chosen to work with a range of materials such as nylon, polyurethane or polyamide conduit.
Threaded-to-Tube Pneumatic Fittings
This type of fitting includes screw-down threading on either the inner (female) or outer (male) edge of the connector, which will be gauged to mate with matching threads on the end of a length of hose or conduit.
Fittings sold with straight threading are intended to form a solid connection between parts, but not necessarily to form an air-tight seal on their own - this threading type will require additional sealant coating or a layer of Teflon tape for use in pneumatic applications. Fittings sold with tapered threading are intended to be airtight without the need for additional coatings or tape. This may be necessary for certain working environments where sealants and coatings may lead to corrosion or contamination.
Thread-to-Barb Air Fittings
This is typically a type of push-on fitting in which the hose or tube is pushed over a barbed end for initial grip, and then a knurled nut is tightened down around the pipe and barb to provide full security of the connection for use under air pressure.