Abstract: An insulated electric terminal assembly having an electrically conductive stud with a knurled outer surface held in locking engagement with a molded dielectric bolt mounted around the exterior surface of the stud, in combination with a molded dielectric nut adapted to be threaded onto the dielectric bolt. The nut is provided with a generally cylindrical surface portion over a predetermined part of its axial length which has a diameter at least as great as the maximum diameter of the remainder of the axial length of the nut, which includes generally parallel flat surfaces for receiving a torquing tool for rotating the nut. A unique configuration of the dielectric bolt head enables it to be securely fastened in snug relationship to a curved supporting surface having an aperture through it for receiving the shank portion of the dielectric bolt.