<VV> Bolt Size - Grade 8 caution

[Sethracer at aol.com]

One final note. Since Grade 8 was originally specified for this  
application, you should use the torque values in the shop manual. Except, I  cannot 
find the Torque value anywhere in my 65 manual. Industry standard for  those 
size bolts (1/4-20 NC Grade 8) is 9-12 Ft lbs. New, nicely plated  bolts 9 
Ft-lbs, plain or worn finish 12 Ft lbs. Using the correct values means  the 
bolt will provide the correct clamping force, and (usually) not back out on  
it's own accord.    
 
Also important. If you substitute a Grade 8 fastener for a Grade 5 - or  
lower - you must use the Grade 8 torque value. The stretch of the correct 
torque  is what makes the bolt stay in place. NOTE! Pay attention to the female 
threads  you are using. They must also be capable of handling the Grade 8 
torque. If you  (over) torque a grade 8 bolt into most aluminum castings, you 
will find out  exactly how they made those aluminum threads, because they 
will be stuck to the  bolt threads as the bolt spins in the hole and falls 
out. Don't be tempted to  change over to Grade 8 for everything. If you can 
supply a Grade 8 (equivalent)  nut for the backside, go for it. But don't 
assume any nut can take the increased  torque.
 
-Seth
 
 
In a message dated 1/28/2017 3:18:56 A.M. Pacific Standard Time,  
virtualvairs at corvair.org writes:

Use only  Grade 8 bolts for this application.  It's a common size and can  
be
confused with a low-grade substitute.
This is a high-stress location  and only Grade 8  is specified.
High strength lock washers are also  installed and I recommend adding some
loctite to the threads when  installing as well.


Danny Davis
Graham     WA
206-643-6718

On Fri, Jan 27, 2017 at 8:46 AM, shortle via  VirtualVairs <
virtualvairs at corvair.org> wrote:

> Colonel,  I can for sure answer 2 of your 3 questions and then guess on 
the
>  last. 1/4 X 20 and 1/2 inch length. I hope this helps.
> Timothy Shortle  in (cold,snowy,icy) Durango Colorado 81301
>
>
>  -----Original Message-----
> >From: Brian via VirtualVairs  <virtualvairs at corvair.org>
> >Sent: Jan 27, 2017 7:50  AM
> >To: VirtualVairs at corvair.org, fastvair at yahoogroups.com
>  >Subject: <VV> Bolt Size
> >
> >Would someone  please tell me the length,size and pitch of the bolts used
> on the  universals on a 1965. Many thanks.
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