Exhaust hardware question

[pampadori]

Seems like an insignificant part, but...
I have researched a little and decided to use stainless exhaust bolts so as to not rust away within a few years. I read that I shouldn't use stainless nuts with them, but maybe copper or silicon bronze.

So is there a benefit of copper or bronze over the other? Does our host offer them? Couldn't find them searching the webstore myself
Thanks for any guidance!

[OffCamber00]

I use copper nuts that i sourced from ********AZ

[Eric Hahl]

Copper for sure.

[pampadori]

Eric, any explanation on that? Bronze is copper with tin added resulting in an alloy stronger than both (i learnt myself with google). But does the added tin make it gall the threads easier or something?

I've found bronze but can't locate copper nuts at mcmaster.

Bronze m8x1.25:
McMaster-Carr

[patz]

Loal muff shop will have the proper nutz.

[tobluforu]

Just type in copper nuts m8x1.25 and you will get tons of sites that offer those nuts. I get every nut and bolt from e-bay now. Just make sure you use nickel anti-seize.

[turbobrat930]

Originally Posted by pampadori

Eric, any explanation on that? Bronze is copper with tin added resulting in an alloy stronger than both (i learnt myself with google). But does the added tin make it gall the threads easier or something?

I've found bronze but can't locate copper nuts at mcmaster.

Bronze m8x1.25:
McMaster-Carr

Here ya go. If you need 8mm, instead of 10mm, just give them a call

https://www.ebsracing.com/product/exhaust-nut-muffler-to-heat-exchanger-10-mm-oem-99908400202-porsche-911-1965-1974

[Eric Hahl]

Either is good but copper is better, they deform and are easy to remove after many heat cycles. Our host sells them.

[gtc]

I've never had a problem with stainless nuts, bolts, and washers on my header to muffler connections.