FIELD: mechanical engineering. SUBSTANCE: device relates to constructions of heads of threaded fastening parts. Device is made in form of embracing or embraced member shaped as alternating curvilinear projections and hollows positioned uniformly over circumference of this member. Form of generatrix of projections and hollows corresponds to characteristics of hypocycloid and epicycloid equations. Embracing member is made as hollow in screw head or installation tool. Embraced member is manufacture as shaped head of bolt, nut or installation tool. As a result, maximum contact area of interacting curvilinear surfaces of fastening part projections and hollows and of installation tool, as well as maximum moment of tightening are obtained. EFFECT: high-strength reliable connection. 3 cl, 8 dwg
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