Nuts used as fasteners come in various shapes and sizes, each designed for specific applications. Common types include hex nuts, which have six flat sides and are the most common type of nut used in fastening applications. Other types include nyloc nuts, which have a nylon insert to prevent loosening due to vibrations, and wing nuts, which have two large metal "wings" for easy hand tightening and loosening.
Nuts are essential components in construction, manufacturing, automotive, and other industries where secure fastening is required. They are used in a wide range of applications, from assembling machinery to building structures, and are available in different materials to suit various environmental and load requirements.