There's wide uses of
hex nuts to fasten 2 objects together. It is considered as part of a fastener with bolt as a partner and is usually a threaded hole. The thread secures the bolt does not loose out while a force, tension or vibration is applied to the object being fastened. Hex nut as the name says is a six sided nut and very popular and commonly used in mechanical, household and industrial hardware uses. These conforms with the standard and if you loose one you can always run to your hardware store to find a replacement.
