Studs, Nuts and Bolts are the few examples of the fasteners. HEXAGONAL NUT: It is a general purpose nut used mostly on fasteners. ... SQUARE NUT: The nut having a square shape is known as square nut. ... FLANGED NUT: ... CAP NUT: ... DOME NUT: ... WING NUT: ... CAPSTAN NUT: ... CASTLE NUT: Mar 22, 2021