FIELD: machine building.
SUBSTANCE: invention relates to threaded fasteners. Fastening element includes three thread zones. In the first thread zone the first thread profile with increasing diameter is used. Second thread zone extends from the end of the first thread zone using the first thread cutting profile and continues with a constant diameter. Third thread zone uses a thread fixing thread profile passing along, in fact, the remaining part of the rod of the fastening element.
EFFECT: optimized thread locking mechanism.
12 cl, 19 dwg
