| 摘要 |
<p>Disclosed is a pierce nut which comprises a cylindrical nut body (1) having an internally threaded bore (2) formed therein, an external cylindrical projection (3) and an internal cylindrical projection (4) with an end surface projecting further from the external cylindrical projection (3), an annular groove (5) provided between both cylindrical projections and on a bottom surface of the cylindrical nut body (1). The external cylindrical projection (3) has an inner surface formed to an inclined side wall (7), which is conically tapered outward and has turning-preventing serrations. This pierce nut can be pressure-formed from a coil rod very easily, ensuring reduction of the manufacturing cost, required little pressing force at the time of clinch installation, and provides sufficient clinching strength so that the pierce nut can reliably be used at a spot where a large load is applied. <IMAGE></p> |
