Method for manufacturing a multi-functional fastener

A method for manufacturing a multi-functional fastener comprising:

• a preparing operation which includes preparing a metal blank, said metal blank being a portion cut from a length of a metal material;
• a forming operation which includes shaping said metal blank so that said metal blank is provided with a head, a drilling portion, and a shank extending from said head to said drilling portion;
• and
• a threading operation which includes preparing a thread rolling set including two rolling plates opposite each other and rolling said metal blank between said two rolling plates, each of said two rolling plates including a rolling surface, an entrance end formed at one end of said rolling plate, an exit end formed at another end of said rolling plate, a top end defined between said entrance end and said exit end, and a bottom end defined in opposing relationship to said top end, said rolling surface having a plurality of slit grooves recessedly formed thereon and spaced from each other, a plurality of convex units being formed on said rolling surface and alternating with said plurality of slit grooves, each of said plurality of convex units being arranged in a line and including a plurality of protrusions, each of said plurality of protrusions being situated between two adjacent said slit grooves, the rolling of said metal blank between said two rolling plates moving said metal blank from said entrance end to said exit end to thereby forma plurality of thread convolutions, a plurality of slots, and a plurality of main ribs on said shank of said metal blank, with each of said plurality of slots situated between two adjacent said thread convolutions, and each of said plurality of main ribs situated between two adjacent said slots.