Black Screw
Drywall Screw is a specialized self-tapping screw with a cylindrical shaft. These screws
almost always have a Phillips Bulge Head rather than a slotted head, which provides
additional control for installers. In addition of a standard drill, installers also use
a tool known as a drywall dimpler, which has an adjustable nose to install a drywall
screw without tearing the paper on each sheet.
A standard drywall screw can be readily identified by its black finish. This black
coloring comes from a phosphate mineral coating that is applied to these screws. This
coating helps to minimize rusting and corrosion as the screws are exposed to wet joint
compound or paint.