The stainless steel machine screw has a plain finish and a round head with a one-way drive. Stainless steel resists corrosion and may be magnetic. The one-way drive has a sloped S-shaped slot that enables installation with a standard slotted driver but resists tampering by requiring a special tool for removal. The round head has a domed shape.
Machine screws are threaded fasteners that are typically used with nuts or drilled and tapped (threaded) holes. Machine screws are available with a variety of head shapes, which determine how the screw interacts with the mating surface, and drive styles, which determine the type of driver required to install and remove the screw.