What gauge sheet metal for rust repair

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PostPosted: Tue Mar 27, 2012 8:47 pm
I can't remember what gauge cars use . I can get either 22 or 16 gauge . My car is a 1970 oldsmobile



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PostPosted: Tue Mar 27, 2012 9:29 pm
I think usually 18 gauge. 16 will work for flat floor patches but its harder to shape



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PostPosted: Tue Mar 27, 2012 9:49 pm
Sorry I forgot to mention the rust I'm repairing is in the quarter panel and fenders. I googled this question before I posted it and I got answers from 14 gauge to 22.

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PostPosted: Wed Mar 28, 2012 12:17 am
If you have a set of calipers you can measure the thickness of the existing metal and then order what you need. Here's some of the common gauges and corresponding thickness of sheet steel:
GA. Thickness
12 - 0.1046
13 - 0.0897
14 - 0.0747
15 - 0.0673
16 - 0.0598
17 - 0.0538
18 - 0.0478
19 - 0.0418
20 - 0.0359
21 - 0.0329
22 - 0.0299
1968 Coronet R/T - a work in progress.


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PostPosted: Wed Mar 28, 2012 3:23 am
In the 1950s and 1960s they used 20 gage cold rolled steel for most of the outer panels, the roofs I believe are 19 gage, and I would be surprised if it isn't the same in the 1970s.



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PostPosted: Wed Mar 28, 2012 6:24 pm
Thanks guys. I'm in the store now. 16 is too thick. So 22 it is. Looks a tad thin but for a small spot itll do.



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PostPosted: Wed Mar 28, 2012 6:34 pm
Heating shops that make the duct work for furnace air return will have the 20 gage, just don't get galvanized. If you do use the 22 gage be aware that it will burn thru just a little quicker while welding.

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