Minimum clearance for tab

Hello;

      I have a part I'm making out of sheet metal; I have a main body, then a tab also; What is the minimum distance I can get by with between the main body

and the tab. Right now I have it at .25, which is the materials thickness, but it would be great for clearance issues  if I could move it over even a bit closer.

Thanks, in advance for any input;

Rob_D SW 2012 sp4

SolidworksSheet Metal