There were senate hearings in the US a number of years back, regarding bolt forgeries. The US army had problems with flywheels coming off M109s, and certain buildings had to have all the bolts replaced after forgeries were found.
Chinese steel (along with may other chinese produced products) seems very hit or miss. One only has to use some of the Princess auto wrenches or pullers to find that out.
I remember seeing UNC/UNF bolts with the metric markings when I was in Cypress 15 years ago.
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