I am in the process of replacing all studs (38mm),
locknuts, and bolts (30mm). After some searching, I
found out that a good choice is SS 316 (A4) grade
(better quality than 304/8/9, and also contains
molybdenum, which provides "superior" resistance to
corrosion) (DIN 931 specification, better quality than
DIN 933).

There are all kinds of other stronger and better SSs
but they are not easily available and if they are,
they are much more expensive.

Combining SS bolts with Copper or Brass nuts should
not be your first choice because it weakens the
different metals'  properties. Try to stick with all
SS.

I will be using Loctite Silver Grade Anti-seize to
coat the nuts, bolts, and other exhaust parts.

You are not supposed to use regular nuts. Use locknuts
and replace them anytime you work on the exhaust. I
bought a bag of SS locknuts. Even though, I may go
with Frank Condelli's advice and use only 30mm bolts.
A little late because I purchased it all, but
something to consider.

Enjoy!

geo

--- TC <trclark@SHAW.CA> wrote:

> 85 1.9 gl
> So i am confused here what really works after 4-5
> year when time to r&r the
> exhaust again
>
> I tried some 304 ss 12 mths ago for the tail pipe
> connected to the muffler
> with anti-seize
> ( the 1800F copper stuff)
> so for shits & giggle when my connector pipe went
> the other day I thought
> I'd see how easy
> the 3 304 ss bolts come off well they wont come
> off.. well really easy any
> ways with a socket wrench
> so I guess I have what they call galling occurring
> when the ss has heated up
> & come off & bonded to the steel
> thread in the muffler...
>
> So now when i do the connector pipe what grade of ss
> do i use 304 is out so
> 3XX or zinc plated ??
> I will try the 2400F nickle based anti-seize
>
http://www.permatex.com/documents/tds/automotive/77164.pdf
>
http://www.jmindsupply.com/permatex-nickel%20antiseize%20lubricant.htm
>

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