Phillips Screw Versus Torx Screw

Here is a quick compare between the Phillips screw and the Torx screw.

Phillips Screw

Invented by Henry Phillips in the early 1930's, the Phillips screw has a cross-shaped recess that facilitates centering the driver on the screw. The recess has rounded corners and angled surfaces, enabling the driver to cam or slip out under high torque.

Phillips screws are more widely available and less expensive than Torx screws. A variant of the Phillips, known as the Pozidriv, offers the ease of use of a standard Phillips screw but with greater resistance to cam-out.

Torx Screw

Developed by Camcar LLC, the Torx screw has a 6-pointed recess in the screw head, technically referred to as a splined socket. The spline resembles a star so the fastener is sometimes referred to as a star screw and the driver as a star driver.

Phillips head screws were purposely designed to cam-out to prevent over-tightening. Torx heads were designed to resist cam-out, thereby offering improved torque transfer between the driver and the fastener. This feature also reduces wear on driver bits.

Torx screws were originally used in applications requiring tamper-resistance because the screws and screwdrivers were not widely available. Today, they are commonly found in the automotive and electronics industries for products such as brake systems and hard disk drives.