BCST stainless steel tube fittings are thin-walled fittings that connect instruments to a tube or two tubes. In simple words, tube fittings connect tubing runs (for in-line, offset, multiport, and mounting configurations) to other sections of pipes, hoses, or other components. Systems are typically configured with straight sections joined by fittings or specially formed connections and joints. They are generally used in small-diameter applications. There are a vast number of types of fittings installed in tubing systems that perform different functions. In addition, they need to be reliable, offering sealing in systems in varied conditions such as temperature variations, high pressure, and vibration.

Most tube fittings are intended for use with hydraulic or pneumatic systems. Identifying the core system type is the first step in determining the fittings suited for the application. The transport of liquid media such as water and various chemical solvents is a hydraulic application. Therefore, hydraulic fittings must have seals that prevent liquid leakage and are frequently resistant to rust and other chemical deterioration. Gas transport is involved in pneumatic applications. To prevent gas leaks, pneumatic fittings must have extremely tight seals and be resistant to chemicals. Tube fittings are used in a variety of applications, including structural design. These fittings must have high physical integrity but must not be sealed because they do not convey fluids.