In order to ensure a safe installation and stable mechanical resistance, it's relevant to pay attention to the pilot hole diameter. The recommended dimensions for pilot hole diameter for different plate thickness are available at Design Guidelines.
FASTITE® 2000™ screws have been specially designed for the assembly into untapped thin aluminum and steel sheets. FASTITE® 2000™ screws are the best alternative to self-tapping screws: unthreaded length below the head is larger than the thickness of the assembly, causing the screw to clip the sheet.