04-12-2015, 07:50 AM
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CC Member
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Join Date: Feb 2003
Location: Jonesboro GA,
Posts: 382
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Not Ranked
Quote:
Originally Posted by brettco
Well i know what he means. I have over 20 years in sprint car racing and have seen way more grade 8 bolt faliures where a bolt breaks and im not sure ive ever seen a grade 5 bolt break. Over analyze that statement all you want but ive lived it.
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The number of years that you have gone in circles on dirt does not equal fastener knowledge.
Quote:
Originally Posted by DanEC
Material Grade
" Harder bolts tend to be more brittle and may fail in specific applications."
Grade 8 bolts are treated to additional hardening processes. But it all depends on the application.
At least I think we agree that higher strength rods are unnecessary in this application.
And now my engineering degree and I have to catch a flight.
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So your contention is that grade 5 and 8 use the same alloy with the only difference being hardness? Or is it that you are contending that a grade 8 has a lower shear strength? Or is it that you are contending a grade 8 bolt will break before it bends? Or is it that a grade 8 will fatigue and fail before a grade 5? Being an engineer, you should have no trouble producing a document to substantiate as opposed to waiving your degree. Were not talking about generic statements regarding heat treat and brittleness, specifically grade 8 vs grade 5.
Last edited by mikeinatlanta; 04-12-2015 at 07:52 AM..
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