FASTENER SYSTEM COMPRISING EXTERNALLY THREADED BOLT AND INTERNALLY THREADED NUT FOR AVOIDING CROSS-THREADING OF MATING THREADS DURING ASSEMBLY Russian patent published in 2019 - IPC F16B35/04 

FIELD: machine building.

SUBSTANCE: invention relates to a fastening system comprising an external bolt and a nut with an internal thread. Fastening system for axial alignment and elimination of unfavourable interaction of the thread comprises a bolt body having an external thread, designed to engage with an internal thread pre-cut into a nut element, wherein the external thread of the bolt body and the internal thread of the nut element have the same pitch and the same angle of elevation; the threaded lead-in part of the bolt, wherein the thread of the lead-in part of the bolt has a pitch that is larger than the thread pitch of the bolt body, and wherein the angle of elevation of the thread of the lead-in part of the bolt is greater than the angle of elevation of the thread of the bolt body, and wherein the outer diameter of the lead-in part of the bolt is approximately less than the internal diameter of the thread of the nut element.

EFFECT: invention aims to eliminate the adverse interaction of the thread leading to the jamming of the thread.

12 cl, 4 dwg