[TR] Bolt Grade

[Bob Danielson]

And I believe that the unthreaded shank is precision ground which is why 
driveshaft and axle bolts cost more ($2 each) then standard bolts. They're 
also harder to find from suppliers other then the usual LBC sources.  I 
think Randall told me that many years ago!

Bob Danielson
1975 TR6 CF38503U
Running w/ Throttle Body Injection,
Toyota 5 speed & Nissan LSD
http://tr6.danielsonfamily.org

--------------------------------------------------
From: "Randall" <TR3driver at ca.rr.com>
Sent: Wednesday, November 03, 2010 9:18 AM
To: "'*Triumphs List'" <triumphs at autox.team.net>
Subject: Re: [TR] Bolt Grade

>> A friend wants to replace
>> this bolt with a US equivalent
>
> I can't answer your question, Alex, just wanted to point out that there 
> may
> be more to that bolt than just grade.  For example, TR driveshaft bolts 
> have
> a particular diameter and length of unthreaded shank, and unusually short
> threads.
>
> IMO it's unlikely to be any stronger than SAE grade 5, but that's just a
> guess.  One way to estimate it is to look at the torque spec.  Standard
> torque for a grade 5 7/16-20 is 75 ft-lb.  If the specified torque is less
> than 75, it's probably less than a Grade 5 bolt.
>
> Randall
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