Adding an additional, freely rotating rear ferrule can disconnect the nut from the front ferrule, preventing torque transfer.Ĭompression fittings are most often used with "hard" grade tubing because the tubing wall must be rigid enough to withstand the compression forces applied by the ferule.
With stainless steel, rotation of the ferrule can also lead to wear and permanent leakage. Single Ferrule Made from PTFE (Polytetrafluoroethylene) Ferrule provides a seal when installed within a Compression Fitting adapterCap and body of. Sleeve / Ferrule for MCP Compression Fitting- Product Specs:Ferrule for Compression Fitting for MCP Brake Calipers & Master Cylinders Used with hy. The resulting rotation can cause the ferrule to compress asymmetrically or shift over time due to residual torque. With harder materials such as steel, however, torque is often transferred from the compression nut to the ferrule when the nut is tightened. Single ferrule designs minimize the total number of components and work reliably when manufacturing softer materials (plastic or brass, for example). Most basic compression fittings have a single ferrule. Metal ferrules are suitable for a wide temperature range, and can withstand high pressure loads, without relaxation. Compression fittings are an excellent choice to connect rigid tubing systems and withstand higher pressures than barbed fittings.
Most commonly used ferrules, however, are made of metal. The ferrule is the main sealing component of a compression fitting, and is manufactured in a wide range of material grades, from stainless steel to graphite.
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