Screws

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Screws

Screws

Screws are types of fasteners that have a helical thread on a cylindrical shaft and a head on one end. They are used to join objects together by creating an internal thread in the material or by mating with a female thread. Screws can be made of different metals, such as steel, brass, or stainless steel, and can have different coatings, such as zinc or chrome, to prevent corrosion. Screws can also have different shapes and sizes of heads, such as flat, round, hexagonal, or Phillips, to suit different tools and applications. Screws are commonly used for fastening wood, sheet metal, plastic, and other materials.

Some of the common types of screws are:

  • Wood screws: These screws have a sharp point and a coarse thread that can cut into wood and create a strong bond. They are used for carpentry, furniture, and woodworking projects. Wood screws can have different head styles, such as slotted, Phillips, or square, and different shank styles, such as plain, tapered, or shanked.
  • Machine screws: These screws have a blunt point and a fine thread that can fit into a pre-drilled hole or a nut. They are used for fastening metal, plastic, or other materials. Machine screws can have different head styles, such as pan, flat, oval, or hex, and different drive styles, such as slotted, Phillips, or Allen.
  • Sheet metal screws: These screws have a sharp point and a thread that can pierce and tap into thin metal or plastic. They are used for fastening ducts, gutters, or appliances. Sheet metal screws can have different head styles, such as hex, pan, or truss, and different drive styles, such as slotted, Phillips, or Torx.
  • Self-tapping screws: These screws have a sharp point and a thread that can create their own thread in the material as they are driven in. They are used for fastening metal, plastic, or wood without pre-drilling. Self-tapping screws can have different head styles, such as hex, pan, or flange, and different drive styles, such as slotted, Phillips, or Pozidriv.
  • Self-drilling screws: These screws have a drill bit point and a thread that can drill and tap into the material in one operation. They are used for fastening metal, wood, or composite materials. Self-drilling screws can have different head styles, such as hex, pan, or wafer, and different drive styles, such as slotted, Phillips, or square.
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