different specs have different tol.
Most common grades are made to pass a number of different specs at once. You need to ask the guys making (or selling) it.
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Rust never sleeps
Neither should your protection
What material requirements? The ASTM standards cover the dimensions, thickness tolerances and allowances.
ASTM A 176 covers stainless and chromium
ASTM A 480 covers sheet steel finish. ASTM A 568 Steel, Sheet, Carbon, Structural, and High-Strength, Low-
Alloy, Hot-Rolled and Cold-Rolled, General Requirements
ASTM A 635 Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, and High-Strength Low-Alloy with Improved Formability,...
For A 568 the tolerances are for over thickness - with no under thickness. For thickness down to 0.031 inch the tolerance is as low as 0.010 inch -- increasing to 0.018 inch for thickness 0.180 on sheets over 40 inch wide. Let's say that 11 gauge has a nominal thickness of 0.1196-inch (from memory). The permitted thickness would be from 0.1196 to 0.1356 as this thickness permits 0.016-inch tolerance for sheets over 40 inch wide. The tolerance is only 0.014-inch for sheet narrower than 40 inches. This explains why 11 gauge at 0.1196-inch is called 1/8th inch.
Thanks guys, however I guess I was not specific enough. Yes I know to go to the manufacturer of the product. What I was looking for in a nutshell is a spread sheet that covers the different cold rolled steel sheet gages from 22 gauge to 7 gauge (.25 thick)showing the mills tolerances for each specific gauge. For example 16 ga crs .059 thk +/- .004