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Re: more Re: Taps dies etc. v.2

To: Daniel1312@aol.com, Ajhsys@aol.com, mgagne@unc.edu, spridgets@autox.team.net
Subject: Re: more Re: Taps dies etc. v.2
Date: Tue, 25 Sep 2001 16:17:31 EDT
In a message dated 9/25/2001 3:25:32 AM Eastern Daylight Time, 
Daniel1312@aol.com writes:


> What about strength in shear?
> 

Quoting from the book:  "Shear Strength--The amount of force usually 
expressed in psi, required to shear the bolt into two pieces.  This is 
referred to as single shear and usually has a value of 67% of the tensile 
strength.  Double shear, where shearing forces are applied at two points 
along the shank of the body, would cut the bolt into three peices.  Double 
shear strength is usually about 175% of the tensile strength."

So the way I read it, the Grade 8 also has it all over the Grade 5 in shear 
strength as well.  And the Bowmalloy even greater.  Makes me wonder if the 
engineers didn't use Grade 5 fasteners as a money-saving tactic, and not 
because they were "best" for the application.  Like the use of the 3/8" lugs 
instead of the sturdier 7/16".  A money-saving move after they determined 
that for standard street use the 3/8" would be adequate.

--David C.



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