Re: [PSUBS-MAILIST] Flooded Stability.

["Sean T. Stevenson" <cast55@telus.net>]

I have done a lot of work on mining machinery over the years, and came to 
discover after much trial and error that the personnel at the mines would find 
a way to destroy anything less than 3/4" Grade 8.  I guess the whole notion of 
"a bit of force to help things along" changes when you have many thousands of 
horsepower at your disposal.  At any rate, using hand tools I can twist the 
heads off of 1/4", and deform 3/8", so I tend not to specify anything less than 
1/2" if I can help it, unless I have space or weight constraints.  It is also 
much easier to develop consistent bolt preloads on larger fasteners, as well 
as being easier to keep the threads clean.

-Sean


On March 25, 2010 14:58:37 you wrote:
> Jon, I tend to agree but have also requested an answer from ABS. Hopefully
>  they will answer.  You mentioned 1/4" bolts.  I would discourage 1/4" with
>  a vengeance and ABS also states that 3/8" is minimum.  1/4" does not allow
>  for the idiot factor.  I have used 5/16 or 8mm at a pinch but I just had
>  to replace 6 x 1/4" bolts on my hydraulic reservoir lid which had blown
>  off and used 8mm Grade 8 equivalents.  Also onto a supplier of Titanium
>  bolts.  Regards, Hugh



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