Screws and Bolts

Screws and bolts are commonly used as structural and non-structural fastening materials in aerospace, military and a wide range of industrial applications. Although quite often these terms are used interchangeably, screws differ from bolts as they are generally made of lower strength materials.Screws can be installed with a loose fitting thread, and the head shapes are made to engage a screwdriver or wrench. Some screws have a clearly defined grip (unthreaded portion) while others are threaded along their entire length (fully threaded).