![]() The front ferrule swages onto the tubes as it moves down the cone of the body creating a pressure/vacuum-tight. So the 3/8 inch tubing has a compression fitting with a ferrule probably, while the 1/2-inch end is threaded to attach to a female pipe thread - I think. Common choices are metal tubing (such as stainless steel or copper) and rigid plastic tubing (such as PEEK, nylon, Teflon®, Kynar® or polyethylene). Fittings are supplied complete and ready for use. 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. 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. 4 2223 FREE delivery Jul 3 - 5 More Buying Choices 12. 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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