Quote:
Originally Posted by jeremylee
Are black oxide from a local hardware store typically similar in strength to alloy steel black oxide from McMaster? I've always assumed they were, but I have heard otherwise, so I always wondered.
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Mcmaster has a wider selection and probably a wider quality range. But the equivalent grade would be the same. I mostly use grade 5 which is in the middle.
Commercial bolt threads are almost universally better than shop made. The commercial threads are rolled rather than cut & leaves compressive strain in the threads.