SELF-ATTACHING FEMALE FASTENER ELEMENTS AND METHOD OF FORMING SAME

摘要

The method of forming self-attaching female fasteners (26) by rolling a continuous metal strip (20) including a central pilot portion (28) having parallel sides and flange portions (32) on opposed sides, severing at least the pilot portion (28) and cold forming the rectangular pilot portion (28) into a cylindrical end portion (38). Wing-shaped radial portions (40) are formed in the pilot portion (28) which may be severed or remain for anti- rotation features. The strip may remain continuous, wherein the severed pilo t portions (28) are spread and the flange portions (32) are thinned or the str ip may be severed into discreet fasteners. The female fasteners thus include generally cylindrical pilot portions (28) and rectangular flange portions (3 2) which may include rolled grooves.