Use a wrench for square head bolts and screws. Hex head, like hex cap screws, require a wrench or socket. Also, Phillips, square, hex and Torx® drive screws are popular because there's less chance for the driver to slip out and scratch finish work. (See the Point / Bit Size Guide for information about Phillips, square and Torx® drive sizes, and the Socket Screw Products chart for information about hex key sizes.) Slotted and Phillips screwdrivers work with metric screws, but you must use metric hex keys with metric hex socket screws. 0 will be needed for some very small screws and 3 and 4 for large screws. 0, 1, 2, 3 or 4 Phillips screwdriver (the larger the number, the larger the driver tip). Depending on what size Phillips head screw you're using, you may need a No. For example, don't use a small slotted screwdriver with a large slotted screw, or the wrong size hex key. To prevent head damage, match the driver to the screw head. Use a slotted screwdriver (flat blade) for slotted, combination and one way screws a Phillips screwdriver for Phillips and combination screws a hex key for hex socket and a Torx® driver for Torx® screws. Of the many that exist, the most common are: slotted, Phillips, combination (both slotted and Phillips), hex, hex socket, square, Torx® and spanner. Bugle heads are commonly found in drywall screws, and the head design automatically compresses the drywall paper and gypsum as it is installed thus forming its own countersunk hole.ĭrive style-or drive recess as it is called-refers to the kind of tool you use to install (or remove) the screw. Made of plastic, these caps are available in standard colors that match commonly used plastic laminates and wood. If you are using flat heads screws in finish work, consider using a flat head screw cover (also known as a "beauty cap") to hide the head (not all drive styles will accept screw covers). The advantage is that little or no part of the head protrudes beyond the surface of the material. Unless the material is very soft, flat and oval heads require a countersunk hole. Sometimes features are combined, as in the case of slotted hex, hex washer, slotted hex washer and round washer head designs.Ĭountersunk designs mainly consist of flat, oval and bugle heads. This style includes: binding, button, cheese, fillister, flange, hex, pan, round, socket and low socket, square and truss heads (binding head is occasionally referred to as binder head). Non-countersunk heads-where the head is fully exposed-encompass the largest variety. There are two basic designs: countersunk and non-countersunk. Understanding the differences will help you decide which style to choose. Sometimes the style serves a functional purpose, and sometimes it's more decorative in nature. Screw type fasteners are manufactured with different head styles. Fastener Tech Data | Understanding Series Introduction
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