FIELD: mechanical engineering. SUBSTANCE: invention relates to fastening system containing threaded fastening part featuring predominant torque. Proposed threaded system contains nut member and bolt. Nut member has ring section and nut section. Nut section consists of main body and neck made for displacement into ring section and radial displacement inside thanks to which thread in neck is upset around thread of bolt to form construction with preset tightening precluding loosening of nut member on bolt. EFFECT: provision of joint in which parts are held together under action of previously chosen value of final locking load. 34 cl, 10 dwg
