FIELD: mechanical engineering. SUBSTANCE: invention relates to design of heads of threaded fasteners, heads of tools, punches for forcing out parts. Member to transmit torque to threaded fastener is made in form of alternating curvilinear projections and valleys uniformly spaced over circumference. Profiles of projections and valleys are formed by parametric equations of hypocycloids displaced relative to each other with turning. EFFECT: increased area of contact of side generatrices of wrench and part. 7 dwg
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