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Yes cans are actually numbered.

Standard Can Number Sizes - Everything2.com

The smallest fractional fastener would be 1/4-20 or 1/4-24 depending on whether you need coarse or fine thread....

1/64" increments are not used because the system was not organized that way. You asked a question why you couldn't find 1/16" washers and I gave you an explanation of why. So on this side of the...

That's because you are asking for 1/16" fasteners which don't exist. 0-80 is a thread size (0 diameter and 80 threads per inch). It uses #0 washers (It happens to have a clearance drill size of...

What you are wishing for was used long ago and abandoned.

https://en.wikipedia.org/wiki/Whitworth_thread

Much like the metric system. 5/8" wrench fits nut for 5/8" diameter bolt. Unless you get...