A nut is a fastening device. It is commonly hexagonal, however shape variations are common to suit specific applications. This device has a threaded space inside that is used to fix the position of a nut on a bolt with matching thread. Such devices are used to couple two or more parts together, and are often used as fixation mechanisms on fittings. A subdivision of nuts that have self-locking mechanisms is called locknuts. They are known for the ability to prevent loosening of the connection under torque, pressure, and vibration. Such devices utilize special materials or have construction peculiarities that allow them to do so. Locknuts are especially useful in portable systems or such set-ups that have a lot of vibration of pressure applied to the joints. Mega Depot offers a range of nuts and locknuts for the lowest prices you can find. Shop for the best with MegaDepot.