What are Screw Drives?
Screw drives are fasteners used to secure parts such as screws, bolts or nuts. They may be flat (screw) or cylindrical (nut). There are many different types of screw drives: flat, round, hexagonal and others. Some of them have multiple sizes available.
The most common type of screw drive is the Phillips head screw drive. These are used to secure various kinds of hardware such as screws, washers, nuts and bolts. Other types include Allen heads, T-nuts and other similar types.
Types of Screw Drives
There are several different types of screw drives. All these screws come in different shapes and sizes depending upon their purpose.
Phillips Head Screw Drives
These are the most commonly found screw drives. They are made up of two parts: a head and a nut. A Phillips head screw drive is usually flat, oval or hexagonal in shape. The size varies from 0.095 inch to 1/4 inch diameter.
Most of these screws come with a variety of sizes available which vary from 0.086 inches to 2mm diameter, though some manufacturers offer smaller sizes as well.
The Phillips head screw driver is easy to use and allows you to drive screws into any material with great precision and accuracy.
Flat Head Screw Drives
These are most commonly used in furniture and cabinets. These are easy to use because they can be driven easily with a hammer. They have a flat, oval or hexagonal shape. They are available in various sizes from 0.10 to 2.00 inches in diameter.
Most flat head screws have a single slotted drive with the width varying from 0.05 to 0.20 inches. A few specialty screws come with a double-slotted head or a Phillips head.
Allen Head Screw Drives
These are known as hex bolts or Allen bolts. They are characterized by a hexagonal shaped head. These are available in various sizes from 0.5 to 8mm diameter. Allen bolts come in right-hand and left-hand threads.
The most commonly used are the ones that have a 0.70 to 1.00-inch width and a 0.275 to 0.375-inch depth.
Torx Head Screw Drives
These are characterized by a star-shaped recess with multiple points. They are available in sizes from 8 to 64 points with the most common being the T10, T15 and T20 screws.
Sources & references used in this article:
- Fastener driving apparatus (TH Dorney – US Patent 3,215,324, 1965 – Google Patents)
- Fastener driver (JF Stephens – US Patent 7,802,499, 2010 – Google Patents)
- Driver tool with multiple drive gear layers for heart prosthesis fasteners (TG Schoon, ES Buchanan – US Patent 6,786,925, 2004 – Google Patents)