[DML] Re: Stainless 7mm Nuts

["content22207" <brobertson@xxxxxxxxxxxx>]

Fastenal has a small supply of stainless 7mm nuts still available
(can't remember if they're 18/8 or 316). Stainless bolts are now all
gone, as is threaded rod (I had considered making my own 7mm studs).

Carbon nuts should also be OK with your new studs. I have a stainless
nut on my stock distributor hold down no problem.

The biggest problem with stainless is "galling" -- essentially welding
the threads together during installation. Happens when the protective
outer coating (self generated) wears off, exposing uncoated material
to itself. That's why stainless shouldn't be speed driven.

What is your price on these new studs?

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "PJ Grady" <rob@xxxx> wrote:
> Hi Bill,
> 
> Not anymore! If you want a set of HARDENED STAINLESS 7MM exhaust studs I
> have a box of them on my office floor awaiting further inspection. These
> beauties are custom made for us and are stronger than the stock
studs yet
> can still be drilled out should one ever fail. Cost will be similar
to OEM's
> because we made a lot of them. I am now researching the best nut and
washer
> combination to use with them. Any comments from the "peanut gallery":).
> Qualified suggestions would be most appreciated because I've received
> conflicting advice over the years about stainless on stainless, brass on
> stainless, steel on stainless etc.
> 
> Robert Grady
> 
> 
> -----Original Message-----
> From: content22207 [mailto:brobertson@xxxx] 
> Sent: Friday, February 13, 2004 1:06 AM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: [DML] Re: Rusty Exhaust Manifold Studs
> 
> Stock exhaust manifold studs are M7x1 -- rather uncommon in carbon
> steel, impossible to find in stainless steel. Those same holes will
> tap extremely easily to 5/16x24 (24 TPI is almost identical to 1mm
> pitch) -- very common in stainless. Tap will thread in as easily as a
> bolt, which is useful for the studs on cylinders 1 and 4 hidden behind
> the crossmember. Replacing carbon studs with stainless steel would
> make future removal problem free. Don't forget the studs that hold the
> manifolds to the crossover pipe (M10x1.5 -- also common in stainless).
> 
> Bill Robertson
> #5939
> 
> >--- In dmcnews@xxxxxxxxxxxxxxx, "D F" <funkstuf@xxxx> wrote:
> > Just a note:
> > One problem with these things is that the studs holding the exhaust
> manifold 
> > are pretty small and often rust.  My car was purchased and started
> much like 
> > yours, with a roaring exhaust leak.
> > Anyway, the bottom line was that I had to take my heads off to get
the 
> > exhaust manifold studs out.  This is just a suggestion.  It is not a
> bad 
> > idea to replace the old studs with larger sturdier studs.  I realize
> some 
> > people won't like that idea, but, it might make them easier to get
> off next 
> > time.  That's what I did.
> > Sincereley,
> > Dale Funk
> > 4984
> > 
> > 
> [Moderator snip]
> 
> 
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