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Re: Grade 8 bolt properties

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I deal with ferro-manurium almost every day and some of it involves engineering.
Gary

Christopher Wright wrote:

On Nov 24, 2009, at 6:58 AM, Gary L. Hodgson and Assoc. wrote:

I have one customer who keeps wanting to use the nice shiny SAE grade 8 bolts because they look better than those black A325 or A490 bolts.
To make things worse, the Counterfeit Bolt Affair of the 1990's hasn't gone away. If anything it's gotten worse. <http://www.nv.doe.gov/library/publications/sitelines/sl100.pdf> The original problem was with so-called grade 8 bolts that were actually grade 8.2 (or something like it) that were understrength or wouldn't hold a pre-load. So when you go through all your spec options keep in mind that you could be getting ferro-manurium fasteners if you don't shop with care.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/members/chrisw/




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