1929 Front Fender Sheet metal gauge

I would suggest trying to use a micrometer with a ball bearing cap on one side to get the exact thickness. They are drawn sheet metal which thins out a bit during the forming process but it is likely close to 19 gage. Ford made their own cold rolled draw quality steel and even provided some to the subcontractors if they charged too much. The US Standard Revised Gage dimensions can be found on line. It's close to the Birmingham or Stubs gage specs as well. Modern cars are closer to 20 or 22 gage depending on era of manufacture.

If they are reproduction types then it could be anywhere within a range of early to modern era thickness.
 
It will/should mic at 19 gauge….hard to find. If you can work it use 18; 20 is fairly common. I think a bit thin but I use it a lot for patches on body
 
What gauge sheet metal should I use to patch rust out in a front fender? Ed

This is kind of a loaded question. As Bill stated, 19 gauge AK is difficult to find, but it is available. As whether to use CR 18 or 20 gauge to me depends on whether you plan to shrink your shape, -or stretch to form your shape. Just remember that thicker metal is easier to weld for most people, but thinner is generally easier to shape. At that point, it just boils down to tooling and skillset.
 
I found a donor fender and a donor running board to make some of the patches. For others I used 20 ga and it worked fine.
 
Ink i got this from Marco
Uss 20ga: .037
 

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Think i got this from Marco
Uss 20ga: .037
 

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