Overview

• Flat head fasteners have flat surfaces that taper toward the screw body to allow for countersinking
• The flat head lies flush against the workpiece
• Phillips drive types have a cross-shaped slot and are used with Phillips drivers
• Steel is strong and durable but less corrosion resistant than stainless steel
• To improve its resistance to corrosion, it may receive additional finishes and coatings
• Type A screws have sharp points and coarse threads
• They are used to cut threads in drilled or punched holes in thin sheet metal.