metalman
Oldtimer
Keep in mind whatever gauge sheet metal you buy it is likely to be undersized by a few thousands.
I noticed this consistently over many years. The squeeze up the rollers used to manufacture the sheet metal and stretch their product.
19 gauge, according to the chart I have is supposed to be .0418", The 19G I bought last time measures .0388-.039".
20 gauge is on the chart at .0359". So my 19G is only about .003" thicker, kind of like a fat 20G, half way between 20G and 19G.
Maybe it is a difficult thing to control in manufacturing but they don't error in your favor.
I noticed this consistently over many years. The squeeze up the rollers used to manufacture the sheet metal and stretch their product.
19 gauge, according to the chart I have is supposed to be .0418", The 19G I bought last time measures .0388-.039".
20 gauge is on the chart at .0359". So my 19G is only about .003" thicker, kind of like a fat 20G, half way between 20G and 19G.
Maybe it is a difficult thing to control in manufacturing but they don't error in your favor.