FIELD: mechanical engineering.
SUBSTANCE: device has screw head provided with the conical slot. The depth of the slot is less than the width of the screw along the longitudinal axis of the screw. The slot has circular cross-section with several projections which project toward the longitudinal axis and corresponding number of circular segments. The cone angle of the front side of the projections ranges from 5 to 15°. The cone angle of the wall of the circular segments interposed between the adjacent projections ranges from 20 to 30°. The angle of the sides of the projections ranges from 15 to 35°. .
EFFECT: enhanced reliability.
3 cl, 16 dwg
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