| 摘要 |
<p>Provided is an insertion washer capable not only of being inserted from the side of a male screw member such as a bolt, but also of preventing a split nut or openable nut from opening, and increasing the loosening-prevention effect of a tightening nut as well as preventing shifting or falling off. An insertion washer 1A capable of being inserted from the side of a male screw member 2 such as a bolt has a divided opening/closing portion 12 whereby the insertion washer 1A is divided in the width direction, and an opening/closing fulcrum 13 deformably formed with a narrow width as a fulcrum for opening and closing the divided opening/closing portion 12 vertically, a substantially tapered nut engaging portion 14 being formed on a top surface of the insertion washer 1A in a substantially circular manner projecting along a circumferential portion of a penetrating hole 11 through which the male screw member 2 penetrates, and inclining down from the outer circumferential side to the inner circumferential side.</p> |
