Patent ID: 7591623

Claim:
A self-attaching fastener, comprising: a central pilot portion having an outer side wall being annular; an annular flange surrounding the central pilot portion, said annular flange having a planar end face defining a peripheral edge with a diameter greater than a diameter of said outer side wall of said central pilot portion; said planar end face including a plurality of circumferentially spaced first anti-rotation elements, each of said first anti-rotation elements having a planar top face spaced above said planar end face of said annular flange, said planar end face further including a plurality of circumferentially spaced second anti-rotation elements, each of said second anti-rotation elements having a planar top face spaced below said planar end face of said annular flange, one of said plurality of first anti-rotation elements and said plurality of second anti-rotation elements radially extending from said peripheral edge of said annular flange to a location spaced from said outer side wall of said central pilot portion, the other of said plurality of first anti-rotation elements and said plurality of second anti-rotation elements radially extending from said outer side wall of said central pilot portion to a location spaced from said peripheral edge of said annular flange, said first anti-rotation elements circumferentially alternating with said second anti-rotation elements.