A self-attaching fastener which may be formed by cold heading having a body including generally arcuate side faces and planar end faces, a central tubular pilot having a planar annular end face, a primary bearing surface surrounding the pilot and arcuate flanges extending from the side faces having planar surfaces spaced below the pilot end face, wherein one or both faces of the pilot and the flange portions facing the pilot are inclined. In one embodiment, the arcuate flange portions each comprise arcuate segments, preferably having inclined opposed surfaces, or the arcuate flanges may be continuous including an arcuate conical midportion and linear inclined side portions. Antirotation tabs may be integrally struck from either the pilot or the flanges.
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