Ignoramus21145 wrote:
I need to buy some steel sheet, such as appx. 1/2 mm thick, 18x48" or
some such size. Are there any online suppliers who you would
recommend? I want regular steel, non galvanized, preferably suitable
for spot welding. This is for making motor shroud for my wire brushing
motor.

That's a very clever mix of units. Maybe you can work for nasa.