1mm is what i use but it always measures 0.95mm. I only use 0.8 on some difficult areas and some mudguards we roll. 1.2mm is used for floor and structural sections anything needing to be structurally stronger we go to 1.6 and 2mm black hot rolled.
My clasification on the steel is
hot rolled which has the black scale coating.
cold rolled is pickled so has a clean finish. this is confusing but when I order they always call it black cold rolled! but its not black. available in CSA2 and 3 rating. 3 being a deep drawing material.
hope this helps.
My shop is always open for any allmetal shaping/metal meet visitors as long as its pre aranged.
regards
Dave
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