Sheet metal thread forming screws feature a completely threaded shank with sharp threads and tips, which enables them to cut through various materials, including metal, wood, plastic, and other common building materials. It is usual practice to indicate the size of sheet metal screws with a sequence of three digits; these numbers reflect the diameter, thread count, and length of the fastener. A screw for sheet metal that is described as having a diameter of 4, with 32 threads per inch, and a length of 1-12 inches has those dimensions.
Types of Sheet Metal Screws
Self-tapping and self-drilling screws are the two fundamental varieties of sheet metal screws. Self-tapping screws feature a pointed tip intended to pierce metal; however, the metal must first be pre-drilled to utilize these screws. The drill point tip of sheet metal thread forming screws is designed to be readily cut through metal without a pre-drilled hole.
Sheet metal screws can have a variety of various head designs. After installation, the heads of pan or round head screws will protrude above the material’s surface. Flat or oblong countersunk screws will be level with the top of the material. These screws are available with a flat, Phillips, or combination drive.
What Are They Made From?
The most prevalent and frequently most affordable sheet metal screws are those made of carbon steel. These thread forming screws for sheet metal should only be used inside since they are vulnerable to rust and corrosion when exposed to dampness or chemicals. Although they often cost more than normal steel screws, galvanized or stainless-steel screws are made to withstand rust and corrosion. Zinc or nickel can be applied to sheet metal screws to change their appearance.
