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I agree with standardizing fasteners in theory. However, we have never been able to get down to one fastener or one head style or one drive size.
For a starting team, I would say to try for this, but don't hold it as a rigid standard. There are times when you can get yourself out of a tricky dimensional corner simply by choosing a smaller fastener.
If you're just starting out, the new fabrication rules (which will hopefully persist next year) make it much easier to go to metric fasteners. If you haven't yet invested $$$$ in taps, spare fasteners, etc., I would strongly recommend that you "go metric." Although you may have trouble with local supply, you can get almost anything (fasteners, clench nuts, taps, etc) from the mail order houses (MSC, McMaster Carr) in short order.
When we were restricted to Small Parts, this was problematic.
If you standardize on 1-3 fasteners, you can greatly reduce the amount of tooling you have to take to competition.
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