The fastener (10) comprises a stem (100) having a first end with a tip (102) and a second end with a head (104). The shank (100) is a first area (110) starting from the first end and comprises a first diameter (D1) along at least a part of the first area (110) A first area (110) having a cylindrical cross section, and a second diameter (D2) extending from the first area (110) to the head (104) and greater than the first diameter (D1) And a second region (112) having a cross section comprising The first region (110) may comprise a strained portion adjacent to the tip and surrounding at least a portion of the surface of the first region (110), the strained portion having a first diameter (D1) It may have a third diameter that is large and less than or equal to the second diameter (D2).
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