Brass Exhaust nuts, yes or no???

[HoboBeemer]

I am doing a downpipe swap on my CBR600, Now I have always had exhaust studs come undone on their own once the original ones have been removed almost on all my bikes and there have been plenty, even when torqued correctly.

I am looking at putting the longer coupling style nuts on such as these https://www.aimsindustrial.com.au/metri ... el-zinc-fi

I would then drill a hole and lockwire in such a manner as to not allow anyway for it to come loose.

Looking at options the issue I have is that the Honda threads are M7x1.0 thread and these are fairly hard to find in this style of nut, I see a few Piaggio and possibly Vespa places do them but all are out of stock and forums on said makes are having members drilling and retapping M6 nuts for their applications. I can however get Brass Coupler nuts in the correct size and thread but is there any issues using these on a exhaust downpipe?..

I have the options of buying either stainless or OEM replacement studs if that makes any difference?.

Any thoughts?..

[ibgary]

Brass nuts sounds good, I'd stay with stainless studs. Brass is soft so it won't strip out the stud it also is corrosion resistant. Don't know how it interacts with stainless.Brass was used a lot in the Navy because it tends to not seize up. It will turn green.

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[HoboBeemer]

Brass nuts sounds good, I'd stay with stainless studs. Brass is soft so it won't strip out the stud it also is corrosion resistant. Don't know how it interacts with stainless.Brass was used a lot in the Navy because it tends to not seize up. It will turn green.

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Thanks for that, I didnt think it would be a issue but was wondering why others have not mentioned it as the Brass M7 nuts are seeming instock all be it with international delivery but 10 nuts delivered coming in around £12 make it a no brainer than faffing with drilling and tapping M6's...

Regards

[Hugh]

Greetings,

I should have thought that brass coupler nuts with additional lock wire should be just fine, perhaps add some copper slip grease too but don't over tighten.

TTFN

Hugh.

[Asgard]

In theory stainless bolts/studs into aluminium is a poor choice due galvanic corrosion issues

[steve the grease]

https://www.ecas2cvparts.co.uk/flange-c ... 94f4abdecf

Not brass but plated to stop siezure, are you sure they are M7 , usually the japs avoid the odd sizes, which are not that uncommon however in Europe

[Richard Simpson Mark II]

In theory stainless bolts/studs into aluminium is a poor choice due galvanic corrosion issues

Is that why some manufacturers make their bolts out of cheese...?

I knew there must be a reason!

[Asgard]

Blessed are the Cheesemakers

[bowber]

Brass nuts used to be used on exhausts as they don't seize or rot away like steel.

Steve

[Asgard]

Whenever I've had to replace studs/nuts I've always used copper split nuts and High tensile studs and can't remeber having any problems beyond sometimes the stud unscrewing instaed of the nut which is a bit of a faff but no biggie