SELF-ATTACHING FEMALE FASTENER ELEMENTS AND METHOD OF FORMING SAME

摘要

The method of forming self-attaching female fasteners (26) by rolling acontinuous metal strip (20) including a central pilot portion (28) havingparallel sides and flange portions (32) on opposed sides, severing at leastthe pilot portion (28) and cold forming the rectangular pilot portion (28)into a cylindrical end portion (38). Wing-shaped radial portions (40) areformed in the pilot portion (28) which may be severed or remain for anti-rotation features. The strip may remain continuous, wherein the severed pilotportions (28) are spread and the flange portions (32) are thinned or the stripmay be severed into discreet fasteners. The female fasteners thus includegenerally cylindrical pilot portions (28) and rectangular flange portions (32)which may include rolled grooves.