Screw comprising a thread-forming thread, blank for the production of said screw, and screw connection

Abstract

The invention relates to a screw 1 comprising a thread-forming thread 2 for the creation of a metric thread, comprising a load-bearing thread portion 3 and a forming thread portion 4 which is tapered to the tip of the screw. The flights of the tapered thread portion 4 are sharp-edged and fully formed.

1 - 11 . (canceled) 
     
     
         12 . A blank ( 21 ) for the production of a screw, comprising a non-tapered shaft region ( 22 ) to be provided with a thread, and a tapered shaft region ( 23 ) the tapered shaft region ( 23 ) comprising first and second subregions ( 24 ,  25 ), the first subregion ( 24 ) adjoining the non-tapered region of said shaft ( 22 ) and the second subregion ( 25 ) adjoining said first subregion ( 24 ) and extending to a tip of the blank. 
     
     
         13 . (canceled) 
     
     
         14 . The blank according to  claim 12 , wherein each of said first and second subregions are conical in shape. 
     
     
         15 . The blank according to  claim 14 , wherein a cone angle of said second subregion is larger than a cone angle of said first subregion. 
     
     
         16 . The blank according to  claim 15 , wherein a cone angle of said first subregion is between 7° and 20°, and a cone angle of said second subregion is between 10° and 40°. 
     
     
         17 . The blank according to  claim 14 , wherein a cone angle of said first subregion is between 7° and 20°, and a cone angle of said second subregion is between 10° and 40°.