Abstract: An expansion stud for use in a blind bore hole or the like formed in a concrete anchorage or like support, wherein an expansion sleeve is caused to expand radially in perpendicular relation to the longitudinal axis of the expansion stud and to the bore hole wall. The stud is provided at its inner end with a conically tapered wedge tip formation whose smaller end is integral with the main body of the stud. The expansion sleeve is provided with an internal conically tapered bore which corresponds to the conical taper of the wedge tip, such that axial outward movement of the stud relative to the expansion sleeve causes radial expansion thereof perpendicular to the stud axis and the bore hole wall.