Stainless steel tubing fitting11/14/2023 ![]() Though C&T fittings still provide a very solid connection when installed properly, some studies have found that for every three corrosion failures in the field, there is at least one vibration failure. And because the joints are threaded in uncontrolled environments, the fittings can become loose when subject to vibration. Special training is required to use the tools necessary for C&T fittings. They can also introduce metal shavings and cutting oil into the tubing ID, creating the requirement for an additional cleaning operation. These processes are not always repeatable or consistent. However, like compression fittings, C&T fittings can be broken down and re-assembled for maintenance. All of this is typically performed in the field, significantly increasing the installation time and overall cost of using of C&T fittings. To ensure a tight seal, the tube ends must be precision formed with a fine surface finish and then threaded so the tubing is assembled firmly against the joint. They provide a solid and tight connection, where the tube is chamfered (“coned”) and countersunk into the fitting. compression) on one port to an alternative connection on another port, such as NPT or SAE thread, or male NPT to C&T and many other combinations.Ĭone and Thread (C&T) connections are sometimes used in very high pressure applications (up to 150,000 psi), but are most frequently used for “medium pressures” of up to 15,000 psi. Many are also available with the designated style (i.e. Sometimes they are used as reducing fittings for instance from a larger size connection such as 3/8 to a smaller, 1/4 tube. ![]() Each style of fitting is available with the specified size end connections and in different configurations, such as: Seamless stainless steel tubing provides a much more reliable performance than the use of longitudinally welded tubing.įor medium pressure applications (up to 15,000 psi) stainless tube fittings are specified by the tubing OD (outside diameter) i.e. They can all be used with medium pressure to high pressure tubing. The threads allow for positive lock and sealing the end face of tube to the fitting body. ⇒ Cone and Thread Fittings (C&T): Tube ends are coned (chamfered) and threaded. ⇒ Butt Weld Fittings: Permanently joins to the tube end by welding the surrounding metal at the tube end with the fitting. ⇒ Compression Fittings: Slide over the tube and use a ferrule design to coin and seal on the OD of the tube. They are differentiated by their end connections, each having its own advantages and disadvantages in specific applications. Swagelok tube fitting ends are rated to the working pressure of tubing as listed in the Swagelok Tubing Data PDF, available here for download.įitting specifications are shown in the second image.There are three primary styles of medium pressure tube fittings. ![]() Available Swagelok gap inspection gauges assure sufficient pull-up upon initial installation. The two ferrules separate sealing and tube gripping functions each ferrule is optimized for its function. The two-ferrule design of these fittings are easy to install and no torque is transmitted to the tubing during installation. These fittings offer consistent gaugeability upon initial installation and are easy to disconnect and retighten reliably. They can be used for any fluid flow application and provide leak-tight service from vacuum to positive pressure. Polished surface finishes and high purity materials virtually eliminate these fittings as a source of system contamination. They are available in standard fractional tubing sizes for making up stainless steel tubing. These industry standard Swagelok compression-type fittings and components are precision manufactured and offer a gas-tight, metal-on-metal seal. Unions are made with the nuts facing each other. Nut threads are silver plated to prevent galling and seizing of the fitting when tightened.Ĭross unions are used when four of the same-size bare tubing ends need to be joined. This Swagelok® 1/8 in 4-way cross union connects four 1/8" OD tubes at 90 degree (right) angles and is made of 316 stainless steel. ![]() Thermo ThermoChill Standard Temp Chillers.Thermo Neslab Haake ARCTIC Immersion Bath Chillers.Neslab Thermo Cool Heat Recirculating Chillers.Neslab ThermoFlex Recirculating Chillers.Agilent Technologies Vacuum Pressure Gauges.Edwards ELD Series Helium Leak Detectors.Pfeiffer Adixen ASM Series Helium Leak Detectors.OF Series Filtering Systems,External Oil Filtration.Parts, Kits, Temp Indicators, Accessories.ExploraVAC CUBE TVAC Chamber Instruments.ExploraVAC Max TVAC Chamber Instruments.Dry Semiconductor Vacuum Pumps and Accessories. ![]()
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