Quote:
Originally Posted by BBray_T1296
If you dare to mix hardware, be VERY sure to label metric and sae hardware/tools differently. Like opposite sides of the room. Paint metric tools blue and SAE red or something.
Hex keys are almost cross-compatible, but can strip bolts. Same for wrenches (though those usually are easy to tell what size they are). Nuts are not compatible but somebody will try... see troubles with swapping nuts on main breaker and old PDB lugs. You generally had to trash the whole PDB when that happened. (not sure if the new one is different?)
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McMaster sells metric screws with a blue coating. On the rare occasion you have to use metric, go blue.
We paint our metric allen keys red, and imperial keys yellow.