Patent ID: 6863483

Claim:
Screw provided with self-locking rolled thread ( 3 ), wherein, in a plurality of places along its extent, said thread ( 3 ) is deformed in relation the normal thread cross section in that the thread outside diameter ( 21 ) is reduced by radial compression of limited thread portions ( 8 - 12 ), the area of the thread cross section being substantially identical to that of the undeformed thread ( 3 ), characterized in that, while maintaining the slant of the thread flanks ( 19 , 20 ), the thread cross section is symmetrically widened in the outer region ( 22 , 23 ) and reduced in the adjoining inner region ( 24 , 25 ), the transition ( 26 , 27 ) from the widened to the reduced thread cross section lying approximately in the centre of the respective thread flank, and in that the limited thread portion ( 8 - 12 ) extends over two parts of a thread turn ( 5 , 6 , 7 ) such that there result two symmetrically opposite thread portions ( 8 - 12 ) each of approximately ⅙ of the thread turn ( 5 , 6 , 7 ).