Isolating material [RE-wrenches]

[Robert Warren]

Bruce,
 I use nylon washers between these dissimilar metals. You will get a 
dialectric effect otherwise. I have seen some pretty extreme corrosion 
as a result of long term bonding of dis-similar metals, over the years. 
The nylon washers don't break down, but they do get brittle in time, 
which is still OK if there is no movement. Another thing you can try are 
the neoprene washers in any hardware store plumbing dept. They are 
thicker, so you have to use longer bolts. I have found some 1 inch 
diameter, thin felt-type washers which work well with my big fender 
washers, but that was here in England, and I have never found these 
anywhere else. 
 Remember to install a grounding strap between these after you have 
isolated them with all your dielectric washers.
Robert Warren

Bruce Gardiner wrote:

> Wrenches,
> I will be bolting Professional Solar aluminum rails to galvanized 
> Unistrut and would like to get recommendations on a suitable isolating 
> material.  Someone has suggested a thin sheet of polyurethane (1/4" is 
> thinnest) or ABS (1/8" available). What do other wrenches use or 
> recommend?
> It seems impossible to avoid dissimilar metals touching at all points - 
> I will have stainless bolts going into regular steel channel nuts and 
> stainless washers sitting on aluminum rails -where does one draw the 
> line? Thanks.
> Bruce Gardiner
> www.acmesolar.com
> 
> [Non-text portions of this message have been removed]
> 



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robertwarren at mail.com

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