At Napa we've got 2 or 3 different colors of coatings on the bolts we stock. Silver (zinc plated I think) is Grade 5 SAE and 8.8 Metric. Gold plating is Grade 8 SAE and some of the metric 10.9. The rest of the 10.9 stuff is a darker red/copper color. Looking at the head markings is the only way to be sure though, as I have seen plenty of different colored Grade 8 and 10.9 bolts before.
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