Patent ID: 7255523
Filing Date: 2007-08-14
Classification: F16B

Abstract:
1. A fastener comprising: a head; a shaft having a first and second end, said head being affixed to the shaft at the first end of the shaft and the second end of the shaft having a point; said shaft having an upper threaded portion and a lower threaded portion, the upper threaded portion being closer to the head end than the lower threaded section; said upper threaded portion having a first shaft diameter, the lower threaded portion having a second shaft diameter, wherein the first shaft diameter is less than the second shaft diameter; said head having an outer diameter greater than the outer thread diameter of the upper threaded portion and the lower threaded portion; and said upper threaded portion having a first thread angle and said lower threaded portion having a second thread angle, wherein the first thread angle is greater than the second thread angle.