| 摘要 |
PROBLEM TO BE SOLVED: To provide a nut easy to caulk and tighten.SOLUTION: A washer of the present invention is set under the head of a nut and has an insertion hole which passes through the front surface and the back surface of a washer base plate. The insertion hole has the size of allowing insertion of a caulking tube which is provided protruding from the head of the nut. In the back surface of the washer base plate and in the outer periphery of the insertion hole, a recess is formed in a ring shape which is recessed by one step from the back surface. The recess opens in the back surface of the washer base plate and has the width and depth capable of receiving a caulked portion of the caulking tube which is inserted in the insertion hole. In a nut with the washer of the present invention, the washer is installed slidably in the axial direction of the caulking tube by putting the washer on the caulking tube which is provided protruding on the head back surface of the nut and by caulking the washer at the tip portion of the caulking tube.SELECTED DRAWING: Figure 1 |
