Abstract: The present invention regards a nut assembly including a novel breakaway nut, as part of a roof bolt assembly, for use in underground mines to support mine roofs. The present invention further regards a nut assembly for use in threaded bar installation in I-beam structure configurations in the construction industry. The nut assembly includes a breakaway nut affixed to a traditional nut used in roof bolt assemblies by means of a breakaway collar. Each of the breakaway nut, the collar and the traditional nut have an internal central aperture to receive a bolt, bar or cable. The breakaway nut has threading along the interior surface of its central aperture, wherein the diameter of at least the internal most portion of the threading is slightly smaller than the diameter of the threading of the bar or cable; the threading along the central aperture of the traditional nut is sized and configured to accommodate the threading of the bolt, bar or cable.