[TR] Grade 2 lock nuts

[DAVID MASSEY]

 When you get to Grade 8 you are faced with a brittleness and breakage where a lower grade will stretch.  I saw a grade 8 bolt break and it was just holding a rocker shaft pedestal.  Grade 5 is more than adequate.  
 
Dave 

 
 
-----Original Message-----
From: Greg Donovan <greg at gregoryd.com>
To: Triumphs <triumphs at autox.team.net>
Sent: Fri, May 14, 2021 10:06 am
Subject: Re: [TR] Grade 2 lock nuts

A related by different question:

My instinct here, almost always, would be to err on the side of higher grades. Rated for 2, put a 3 on.

One disadvantage with this approach is cost: higher grades, more money. 

Other than higher cost, are there other disadvantages to using a higher grade than absolutely needed?

Are there situations where the lower grade is preferable? E.g., if something's going to fail under stress, you’d rather it be a grade 2 bolt than the expensive component it’s securing.

—Greg



> On May 14, 2021, at 9:44 AM, Nick Black <vintagenick42 at yahoo.com> wrote:
> 
> I believe that the usual nuts and bolts on a TR are equivalent to grade 5 or so and they may have been higher grade in this application.
> Grade 2 seems a bit “wimpy” here. I would not use such a soft nut especially in this application. Also, do not use “standard” bolts here as the flanges need to ride on the shank of the bolt, not on the tread. Either buy the correct bolt and nut or use  NAS bolts and grade 8 locknuts.
> 
> Of course I may be a little “nuts” myself...
> Nick in NorCal 

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