What Are the Different Types of Screws?
Screws are amazingly versatile and powerful fasteners. The basic concept is used for holding all sorts of things together including wood, plastic and metal. Different varieties have been developed to maximize efficacy for particular applications. Driving Methods • Slotted: Slotted screw heads are perhaps the oldest and most common variety; a linear slot in the head accepts a standard, or flat, screwdriver. • Phillips: The phillips head is an improvement to the slotted screw; cross-shaped grooves accept a phillips-head screwdriver. These heads provide a larger mating surface between the screw and the screwdriver, which minimizes wear and helps prevent slipping. • Hex: These heads do not have any grooves or slots at all; the entire head is hexagonally shaped and they are tightened with a wrench. Since the size of the heads varies, a wrench set or an adjustable wrench is required for driving hex screws. • Square: Also know as Robertson drive, these heads have a square indentation to minim
