There are still counterfeit bolts floating around the country that were made in unknown places. The costs are low so purchasing agents buy those bolts, not realizing that they are probably sub-standard.
There are charts available that explain the head markings on bolts and how to identify who made the bolts. If you can't match the head markings to anything on the charts, the bolts are probably counterfeit and have never been tested in a lab. We fought counterfeit bolts at ADOT through the 80's and 90's on were still fighting them when I retired; they kept showing up in name brand equipment because they where cheaper. The record was 143 bolts on a small paver that the manufacturer had to change out to comply with the specifications so he could get paid.
If you can get a copy of the certified bolt manufacturer's head markings, you can protect yourself from buying inferior/untested bolts. Those counterfeit bolts are in the pipeline and it will take years to eliminate them.
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