Fri. Feb 23rd, 2024

Screws come in many different shapes, sizes and types for a variety of tasks and environments. The correct screw for a job depends on the thickness, density and strength of the substrate material you’re working with as well as the load it needs to hold or anchor.

Fasteners (screws and bolts) are sized by their diameter, threads per inch, length and head type. Diameter is usually a one or two digit number, while threads per inch is shown as a fraction and is typically represented by counting the number of thread peaks over an inch of screw length. Length can be measured from the base of the head for flat and hex heads, or from where the round countersunk head rests on the material for non-countersunk screws.

Choosing the right fastener size will depend on what you’re working with, but a few key things to keep in mind are:

The drive style, or “drive recess,” refers to the kind of tool that can be used to install and remove the screw. The most common drive styles include slotted, Phillips and combination (both phillips and slotted) as well as hex, square, and Torx(r).

Finally, the head type refers to the shape of the screw head. There are a wide range of head designs including: oval, hex, pan, socket and low socket, bugle and square. screw sizes

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