A self-tapping screw is designed to form its own threads as you drive it into a material such as plastic or metal. In the past, you had to drill a guide hole before driving in whatever kind of screw would be used. Self-tapping screws create their own hole as pressure is exerted on them. They also provide a close, tight grip and a degree of certainty that the hole and screw fit exactly.
Slotted tapping screws are threaded fasteners with a coarse thread and a slotted head that can be driven with a flat blade screw driver. It has the ability to tap threads into the material. Tapping Screws are also sometimes called sheet metal screw. Slotted head tapping screws are suitable for use in an unthreaded hole.
Slotted pan head self tapping screw(sheet metal screws) also called framing head sheet metal screws, they have conventional head for general applications to replace round head type and could provides low profile fastening. Normally slotted screws are assembled by slot driver with hand.
