CORROSION PREVENTIVE FITTING

摘要

PROBLEM TO BE SOLVED: To provide a corrosion preventive fitting capable of assuring the ease of mounting to the head of a bolt or nut and suppressing the increase in the length in the axial central direction of the cylinder while absorbing the manufacturing errors of the inside diameter of the inner peripheral surface of the corrosion preventive cylindrical body and the dimensional tolerance of the head of the bolt or the nut. SOLUTION: The inner peripheral surface 5a of the corrosion preventive cylindrical body 5 which is press fittable onto the head part of the bolt or the nut from the axial central direction of the bolt and is made from a metal of a low potential having a higher tendency to ionization of the metal constituting the bolt or the nut is formed to a tapered surface of the diameter larger toward the press-fitting opening side in the axial central direction of the cylinder. Slits 6 opening to the press-fitting opening side in the axial central direction of the cylinder are formed respectively at the plural points in the circumferential direction of the peripheral wall 5A of the corrosion preventive cylindrical body 5 so that the peripheral wall part 5B adjacently existing between these slits 6 are made elastically deformable outward in the diametral direction as the corrosion preventive cylindrical body is press fitted onto the head of the bolt or the nut.