In nut is in soarte fan fastener mei in threaded gat. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together.

Yn applikaasjes dêr't trilling of rotaasje kin wurkje in moer losse, ferskate skutten meganismen kin tsjinst: lock washers, jam noten, spesjalist adhesive thread-skoatteltoets fluid lykas Loctite, feilichheid pins (split pins) of lockwire yn gearhing mei castellated noten, nylon Inserts (nyloc moer), of in bytsje oval-shaped diskusjes.