Copper header nuts?
 

I recently bought some copper M8 locking nuts for my PMO install and thought they might be a good solution for my SSI units. Looks like the M10 hex head allows use on all of the studs so one can ditch the barrel nuts. Anyone have experience with these? I know that my e46 M3 had copper nuts.

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They work great. I still use anti-seize with them just to make sure.

Works great on the exhaust.

I am using them since 20 years on a big number of engines made. Never had any issues.

Put them on my SSI's......no problems.

Thanks folks! Installing tonight!

Work good. I don't use any anti seize. They still come off when you want them too, and stay put when you want them too.
Alan

yeah I think anti seize in this particular application is like dropping an ice cube into a volcano. I use copper also , never considered replacing the barrel nuts with them though , nice idea , and a lot cheaper.

"yeah I think anti seize in this particular application is like dropping an ice cube into a volcano."

Not true, a good nickel anti-seize makes a huge difference in preventing corrosion on any exhaust fasteners. A high purity nickel anti-seize is good to 2400 F. I've been using it for decades and it works. But you have to get the industrial quality stuff. A higher grade fastener also has more corrosion resistance because it has some nickel and chrome in it.

I use them with Loctite n-7000. thread lube. always come back off fine and never get loose. same with turbo flange nuts.

Regardless, the studs are steel. They want to rust. They're in a nasty environment (heat, moisture, road debris).

For long term confidence, consider installing SS acorn nuts filled with anti-seize to protect the exposed end of each stud (fitment not yet confirmed).
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McMaster-Carr

Use whatever there is to reduce corrosion in this area. Nickel-based AS is as good as any. YMMV.

Sherwood

They're really copper coated steel, don't use Stainless Steel.
SS is soft and it will gall when you try to remove them

Milk of Magnesia is a good anti-seize, IIRC it's what the air force uses on jet engines.

yes copper coated steel not actually solid copper

I wasn't clear in suggesting using acorn nuts as a cap to protect the exposed threads, not as the primary fastener (copper-coated nut or equiv.).

While Milk of Magnesia (magnesium hydroxide) might be a good anti-seize; supposedly dries to a fine powder, how does it stand up to protecting exposed threads and the elements (water)? I suspect it'll work as designed when captured between two threaded fasteners.

And then some sources say that Nickel-based anti-seize contains heavy toxic metals; may react with aluminum, and to thus use Copper-based AS.

A couple of discussions here:
Milk of Magnesia for my exhaust ring bolts. : Norton Commando Classic Motorcycles
Unusual anti-seize compound | Industrial- Other / Off Topic | Bob Is The Oil Guy

Sherwood