<VV> Bolt Size - Grade 8 caution
Sethracer at aol.com
Sethracer at aol.com
Sat Jan 28 14:50:28 EST 2017
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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