| 摘要 |
A self-piercing nut for use with relatively thick metal panels has four independent posts ( 9 ) formed integral with respective corners of a nut body ( 2 ) and providing four seat faces ( 10 ). The pilot portion ( 6 ) has an end face ( 7 ) for punching a hole in the panel is projected beyond the seat faces, and the nut body ( 2 ) is a pressed boron steel article entirely hardened by the quenching method so as to show a strong piercing force. Height 'H' defined between a bottom of the panel engaging groove ( 8 ) and the pilot portion end face ( 7 ) is generally equal to maximum thickness of the metal panel. Further height 'h' defined between the seat face ( 10 ) of each corner post ( 9 ) and the pilot portion end face is generally equal to minimum thickness of the panel.
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