FIELD: machine building.
SUBSTANCE: self-drilling screw is made with, at least, a rod having thread in some places and defining longitudinal axis. At the free end of the rod there is a drilling top, at the opposite second end there is a head. The rod is made with, at least, one first cutting edge and, at least, one second cutting edge that lies in radially external zone of drilling top. The first cutting edge is located exclusively in radially internal zone of drilling top. Defined by the first cutting edge conical side surface corresponds with maximum deviation of +/-10% to defined by the second cutting edge conical side surface. The first sharp angle of the first cutting edge to the longitudinal line corresponds with maximum deviation of +/-5° to the second sharp angle of the second cutting edge to the longitudinal axis.
EFFECT: quick drilling at little pressing forces.
6 cl, 4 dwg
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