wait again mark there is very little shear load on the bolts that hold the
upper spindle to the car frame , since the upper a arm pivots on the shaft,
and the geometry of the pivot pt to the action of the a arm only applies
very little shear the biggest load is tension on the bolts. Now on the
bottom A arm where the attaching bolts for the shaft are 90 deg. to the
applied force on the shaft the bolts their would have a greater shear load
but not the top
also the blot used should be a 7/16 fine thread not a metric
Mike Kerr
Roadster Restoration
3730 Todrob LN.
Placerville CA. 95667
Ph.# 530-644-6777
Fax# 530-644-7252
E-mail: mikekerr@innercite.com
Web page : http://www.innercite.com/~wolfgang
Visa & master card
-----Original Message-----
From: Marc Sayer <msayer1@concentric.net>
Cc: ROADSTER <datsun-roadsters@autox.team.net>
Date: Wednesday, May 26, 1999 1:35 PM
Subject: Re: An upper control arm suspension question.
>Philip Erickson wrote:
>>
>> Teddy
>> Hello from San Diego 70's (Burr) and clear
>> 8.8 are only SAE grade 5 bolts.
>> !!!!!! Use 10.9 bolts or SAE grade 8 for suspension !!!!!!!
>> I have seen that done on race cars to get full back caster with 2°
camber.
>> I would use one regular and one lock nut on each bolt.
>
>WAIT! Grade 8 bolts are stronger in tension, but are more brittle than
>Grade 5 and are not as well suited to shear loading, especially single
>shear. If you want bolts that are better than stock, get a shanked bolt
>the correct length for your application in a grade designed for the
>loading the fastener will see. In many OEM suspension applications this
>is exactly what the manufacturer used. Grade 8 is not better suited for
>many of the automotive apps, such as some suspension applications. In
>fact in some applications the Grade 5 bolt is the better fastener.
>
>--
>Marc Sayer
>Editor/Publisher
>Z Car & Classic Datsun Magazine
>http://zcarmag.com
>Voice 541-726-6001
>Fax 541-746-0863/726-6001
>
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