FIELD: borehole drilling. SUBSTANCE: screw face motor has stator, rotor and bearing unit which includes body, shaft, axial and radial supports. Stator and body of bearing unit are manufactured in the form of one tubular shell. Upper part of shell has screw teeth of stator. Outer bushings of radial supports and outer races of axial support are joined permanently with shell with the aid of protrusions on inner surface of body and recessions in outer surfaces of races. Relation of thickness of wall of body to outer diameter is within 0.04-0.065. EFFECT: increased durability and efficiency. 2 cl, 5 dwg
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