The part is great for the price. Only one side is distorted from shearing. The other side is sufficiently flat for the gasket seating surface.
#33101 SS EXHAUST FLANGE
I thought these were laser cut. They were punched out which distorts the flatness and leaves pulled and smeared metal that may need grinding away to fit tubing. Then then it takes more sanding on a large belt sander to get flanges flat and parallel.
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P/N# 33021 Is a 1018 Mild Steel. P/N# 33102 is a 321 Stainless Steel.
Yes, that is correct.
They are both about a 1/4" thick.
The center hole is 1-1/2".