| 摘要 |
PCT No. PCT/EP84/00415 Sec. 371 Date Jul. 30, 1985 Sec. 102(e) Date Jul. 30, 1985 PCT Filed Dec. 20, 1984.A self-cutting fast construction screw for the fastening of fiber plates to a metal substructure carries on the screw shaft at least one turn of a thread. The screw core passes into a conical drill point. On the conical drill point two cutting edges are arranged in a symmetrical layout, said cutting edges cutting to a diameter located between the diameter of the screw core and the diameter of the outer thread tip. Upon impact on the metal substructure, the two cutting edges break off. |
