SCHRAUBVERBINDUNG FUER BOHRGESTAENGE.

摘要

The performances of a threaded joint for the screw connection of rod elements with frustoconical threads are at least doubled in relation to threads conforming to present standards when the opening angle ( alpha ) of the cone and the angle of inclination of the helix ( beta ) at the start of the thread are selected in such a way that their ratio is less than 2.