Phillipshead

Phillipshead refers to a type of screw drive characterized by a cross-shaped recess at the head. This design was invented by Henry F. Phillips in the 1930s. The primary advantage of the Phillips head screw over earlier slot-head screws is its ability to center the screwdriver automatically, reducing the risk of the screwdriver slipping out of the recess. This self-centering feature also allows for greater torque to be applied during insertion without stripping the screw head.

The Phillips screw design features four points of contact, creating a "cam-out" effect where the screwdriver is designed to disengage from the screw head if excessive torque is applied. This prevents over-tightening and damage to both the screw and the workpiece, making it ideal for mass production and automated assembly lines. Variations of the Phillips head, such as the Pozidriv, were developed to further improve torque transmission and reduce cam-out. Phillips head screws are widely used in construction, electronics, automotive manufacturing, and various consumer products.