Is there a rule of thumb, or a table which helps one determine what is the maximum strength thread size to use for aluminium sheet?
I am interested in threading 3mm, and 2mm thick sheet aluminium. I am wondering what size of thread I should go for. E.g. M3 in 3mm sheet, or could I go M4, M6? With 2mm I would guess M3, but not M4?
I have not found an authoritive source, just answers ranging between equal to the thickness (M3 in 3mm), down to 50% of the thickness (M3 in 6mm).