Posted by Brendon-KS on April 02, 2018 at 20:14:53 from (63.245.145.35):
In Reply to: Chinese bolts? posted by rrman61 on April 02, 2018 at 12:53:51:
If a hardware supplier knowingly misrepresents hardware by not having the material properties match the grade stamping it is a violation of US law. I'm not saying this doesn't happen but Public Law 101-592 is in the books to at least discourage it.
At work when we see hardware issues pop up in applications where problems haven't been seen before we first look to see if the type of plating or other surface treatment changed. If the bolt, nut, or washer gets a surface treatment that lowers the coefficient of friction below what was used in the past the previous tightening torque can generate enough clamp load to fail the bolt. Having oil on the threads or face of the nut where the torque is specified for a dry connection can also cause failures for the same reason. The hardware material strength is easy to focus on but in 20+ years at my job I've never seen a piece of hardware tested in our lab that didn't meet the minimum requirements of the grade it was stamped with, regardless of the country it was sourced from. As I said above, I'm sure it does happen but in my experience (so far, at least) it has always been some other variable that causes problems, not the hardware material itself.
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