ok so my noob question in regards to (press brake) material types and gauge tolerances.

2.1 #1. Stainless steel sheets metals

2.1.1 Stainless steel sheets Use

2.2 #2. Copper sheet metals

2.2.1 Copper sheet metal Uses

2.3 #3. Brass sheet metals

2.3.1 Brass sheet metals Uses

2.4 #4. Corrugated sheet metals

2.4.1 Corrugated sheet metals Uses

2.5 #5. Galvanized sheet metals

2.5.1 Electro-Galvanized sheet

2.5.2 The hot-dipped metallic coated sheet

2.5.3 Galvanized sheet metals Uses

2.6 Other Minor types of Sheet Metals

2.6.1 #1. Cold Rolled Steel Sheet

2.6.2 #2. Hot Rolled Steel Sheet

2.6.3 #3. Mild Steel Sheet

2.6.4 #4. Aluminum Sheet Metals

 is their a standard somewhere to reference or are the tolerances per-bend/angle determined by the designer?

thanks again for any links or mentoring here, thanks