[TR] Bolt Grade

[Alex]

Thanks John.
Answered all the questions at hand.

Alex

PS Great information!

----- Original Message ----- 
From: "John Finlayson" <john_finlayson at telus.net>
To: "Bob Danielson" <75tr6 at tr6.danielsonfamily.org>; "Randall" 
<TR3driver at ca.rr.com>; "'*Triumphs List'" <triumphs at autox.team.net>
Sent: Wednesday, November 03, 2010 8:59 PM
Subject: Re: [TR] Bolt Grade


> The following website gives some insight into British bolt grades......
>
> https://www.britishfasteners.com/forum/showthread.php?50-British-Strength-Rating-Codes
>
> An R rated bolt is similar to a Grade 5 according to Curt, the author of 
> the post on that site.
>
> John Finlayson
> '62 TR4
>
>
>
> ----- Original Message ----- 
> From: "Bob Danielson" <75tr6 at tr6.danielsonfamily.org>
> To: "Randall" <TR3driver at ca.rr.com>; "'*Triumphs List'" 
> <triumphs at autox.team.net>
> Sent: Wednesday, November 03, 2010 8:00 AM
> Subject: Re: [TR] Bolt Grade
>
>
>> 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