around the inner edge for a purpose to be described hereafter this assembly as so far described is of conventional well known construction and need not further be shown or described in detail to secure the wheel 16 to the axle flange 10 a plurality of wheel nut assemblies 24 are provided only one of which is shown in fig1 and 2 the wheel nut assembly 24 is of improved construction and comprises a nut 26 generally made of a low carbon steel the body of the nut is preferably hexagonal in shape to provide a plurality of planar angularly disposed adjoining surfaces 28 adapted to be engaged by a socket wrench or the like for tightening or loosening of the nut the nut 26 is provided with a central threaded aperture 30 adapted in assembly to engage the threads 19 of the wheel stud 18 the lower end of the nut 26 is provided with a radial conical surface 32 which extends into a cylindrical land portion 34 adjacent to the land portion 34 the radial outer surface of the nut is chamfered as at 36 preferably at an angle parallel to the angle of the conical surface 32 the top of the nut 26 is provided with a flat.