The most common fasteners used for assembling materials together, threaded screws are available in a wide variety of head shapes and driver fits but functionally may be divided into a few main categories:
Machine screws are blunt at the tips and finely threaded along straight shafts. Thicker metals are fastened together by inserting machine screws into tapped holes that have been specifically threaded to accept them. Alternatively, a machine screw may be inserted through a wider hole and securely held in place using a matching nut.
Wood screws have shanks that are smooth toward the head. On the other end, coarse spiral threading culminates in a tapered point at the tip. Used to join wood to wood, these screws are best installed using existing drill holes to prevent splitting the wood.
Sheet Metal Screws
Sheet metal screws are mostly straight down the shank with tapered tips. Unlike wood screws, sheet metal screws are fully threaded up to the head. The sharp point of a sheet metal screw makes it effective for directly penetrating sheet metal without need of an existing drill hole. Designed primarily to join sheet metals, these screws also work on plastic surfaces and may even be used in place of wood screws.Different jobs call for different screws. For more information on what kind of fasteners you need for your project, contact Ascension Fasteners today.