Re: Which metal gauge do you use?
my Machinery's handbook (14th edition, 1949) gives the thickness of 18 ga as o.0403, 19 ga as 0.0359 and 20ga as 0.0320. According to that, there's a spread of .008 from the thickest to the thinnest. That was in 1949, how much may have changed is anyone's guess.
Terry
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