Patent ID: 9328762
Filing Date: 2016-05-03
CPC Classification: F16B

Claim Text:
1. A pierce nut that is adapted to be driven into engagement with a high-strength steel plate, the high-strength steel plate is a high-tension steel plate having a tensile strength of at least 980 MPa, the pierce nut comprising: a female screw thread portion formed in a center of a nut body; an annular piercing portion projecting around the female thread portion; and an annular outer peripheral projection extending from the periphery of the nut body, wherein the outer periphery of the piercing portion forms a first sloping surface increasing in diameter toward a leading end thereof, and also the inner peripheral surface of the outer peripheral projection forms a second sloping surface increasing in diameter toward a leading end thereof, and wherein serrations are formed on the second sloping surface and the first sloping surface central angle is between 10° to 30°, and the second sloping surface central angle is between 40° to 80°, and wherein the first sloping surface and the serrations formed on the second sloping surface are adapted to be engaged with the high-strength steel plate.