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Old 02-21-2021, 05:04 AM   #17
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Quote:
Originally Posted by elgyqc View Post
Found this on Amazon (Canada) with SS nuts. Is there a problem using the SS nuts on SS studs or are the brass nuts a lot better?
https://www.amazon.ca/Big-Autoparts-Stainless-Exhaust-Manifold-Manifolds/dp/B074J3VT1X/ref=sr_1_6?dchild=1&keywords=M8+stainless+studs&qid=1613910587&sr=8-6
SS should be less likely to seize since it is very resistant to oxidation, but copper is theoretically better. The problem with using similar metals is that heat cycles can create immense pressure and this can result in a type of welding (called cold welding in reference to the fact that it happens in the presence of a true vacuum). In addition, the products of oxidation of similar metals in contact with one another will be able to form a solid crystalline structure which will effectively bridge the two structures. Cold welding cannot happen with dissimilar metals, and dissimilar metals will have different oxidative byproducts. Hence the theoretical advantage of copper plated nuts. In the real world does it really work? I don't have the experience to tell you. But I can tell you my kit came with SS nuts and I still went with copper plated ones.

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