Abstract: A bolt assembly (22) for securing together members (10, 12, 14) having generally planar abutting surfaces, the bolt assembly (22) comprising a main axis (46), a tapered pin (24), a bush (32), and a means to supply an axial force; the tapered pin (24) comprises a narrow end (26), and a distal end (54); the bush (32) is defined by a generally annular wall (40) and, in use, is disposed substantially within coaxial holes (16, 18, 20) defined in the members (10, 12, 14) and surrounds the tapered pin (24); wherein the bush (32) is radially expandable so that when the means to supply an axial force is employed the tapered pin (24) is drawn into the bush (32) in the direction towards the narrow end (26) from the distal end (54) and thereby radially outwardly expands the bush (32), relative to the main axis (46), to abut the members (16, 18, 20) and substantially prevent relative movement between the members (16, 18, 20).