Patent ID: 6851906

Claim:
A nail-shaped fastening element, comprising a stem; and a head ( 3 , 13 , 23 , 33 ) provided at one end of the stem and projecting radially beyond the stem, the stem tapering at another, free end thereof toward a tip ( 5 , 15 , 25 , 35 ) and having a substantially bullet-shaped first section ( 1 , 11 , 21 , 31 ) extending from the tip ( 5 , 15 , 25 , 35 ) in a direction toward the head ( 3 , 13 , 23 , 33 ), and a second conical section ( 2 , 12 , 22 , 32 ) adjoining the first section ( 1 , 11 , 21 , 31 ), extending between the first section and the head ( 3 , 13 , 23 , 33 ), tapering substantially uniformly toward the tip at a uniform inclination angle, and having a length (L 2 , L 12 , L 22 , L 32 ) smaller than a length (L 1 , L 11 , L 21 , L 31 ) of the first section ( 1 , 11 , 21 , 31 ).