HC>ccout.genauto.com>
Hal Wrote:
HC> Grades refer to the tensile strength of the fastener.
HC> Bolts are generally marked with hashes on the head in a radial
HC> pattern, higher grades of fasteners having more marks, and more
HC> tensile strength.
HC> When you torque a fastener, what you are really doing is stretching
HC> the unit to its proper tensioned length, with the torque a convenient
HC> method of determination. This ensures that the fastener will not
HC> loosen inappropriately or fail due to over stress.
snip>
Folks, please be careful when screwing around with what the Engineers
did for you.
Some applications require the lower grade bolts...
Think about it, the harder the bolt ( higher the grade ) the more
brittle it is. There are some places where you don't want a brittle
bolt ! An extra high gade bolt on suspension parts may not be good,
an overload, and SNAP, were a lower grade would bend a little...
See my point ? The RIGHT tool, for the application, including
fasteners !
John Kahoon
71 midget ( stock fasteners :)
HC>______________________________ Reply Separator
HC>_________________________________
HC>Subject: Re: Fasteners
HC>Author: <jphender@soli.inav.net > at ccout
HC>Date: 1/13/98 8:42 AM
HC>Thanks for the advice Shawn,
HC>Can someone give a quick tutorial about "grades" of fasteners? What is
HC>unacceptable and why? Are they marked with a code? I don't think asking
HC>my local hardware guy would necessarily yeild a correct answer. I am a
HC>RELATIVELY bright guy, and I didn't even know I had a choice!
HC>The only thing I've used stainless on was the manifold/block and
HC>manifold/pipe junctions. Are there any others I should change before they
HC>freeze up?
HC>The "stock-up" list that Shawn started (may it grow ever more complete!)
HC>is great. There is a visible path from my house to the Coast-to Coast
HC>store. (My '87 horizon drips a bit. Who wants to work on one of those
HC>anyway!)
HC>Jim Henderson
HC>'69 Sprite MKIV HAN9U78817G
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þ SLMR 2.1a þ john.kahoon@pcohio.com
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