As a plumbing expert with years of experience in the industry, I've seen a variety of materials used for different plumbing applications. When it comes to the compatibility of stainless steel fittings with copper tube, there are several factors to consider.

Firstly, it's important to understand the properties of both materials. Copper is a malleable and ductile metal that is widely used in plumbing due to its excellent heat transfer properties and resistance to corrosion. It is a common choice for water supply systems and heating applications. On the other hand, stainless steel is known for its strength, durability, and resistance to rust, making it suitable for a variety of applications, including high-pressure and corrosive environments.

Now, when you mention "stainless steel fittings on copper tube," it seems there might be a bit of confusion. Typically, the type of fitting used is determined by the material of the tubing. Brass fittings are often used with copper tubing because they are soft enough to allow the ferrule (a small ring that provides a seal when compressed) to bite into the copper, creating a secure connection. However, this is not the case with stainless steel fittings.

Stainless steel fittings are designed to work with stainless steel tubing. The reason for this is that stainless steel is significantly harder than brass, and a brass ferrule would not be able to compress and form a tight seal against the stainless steel tubing. This is due to the hardness and strength of the stainless steel, which would resist the deformation required for a proper seal.

If you were to attempt to use a stainless steel fitting on a copper tube, you would encounter several issues. Firstly, the hardness of the stainless steel would not allow the ferrule to compress and create a seal as it would with a brass fitting and copper tube. This could lead to leaks and other problems. Secondly, the different coefficients of thermal expansion between stainless steel and copper could cause issues over time as the materials expand and contract at different rates when heated or cooled.

In addition, there are also considerations regarding the compatibility of the threads and the types of connections used. Stainless steel fittings may have different thread sizes or types compared to brass fittings, which could make them incompatible with copper tube connections.

In conclusion, while it is technically possible to use stainless steel fittings with copper tube, it is not recommended due to the potential for leaks and other issues. It is always best to use fittings that are designed for the specific type of tubing you are working with to ensure a secure and long-lasting connection.

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Brass is for use with copper tubing, and stainless steel is for use with stainless steel tubing. If you try and use a brass fitting with stainless steel tubing, brass isn't hard enough for the ferrule to --bite-- into the stainless steel tubing; therefore, you will not be able to obtain a proper seal.Apr 13, 2012read more >>