BOLT Russian patent published in 1999 - IPC

FIELD: manufacture of fastening products, for example by rolling, forging, drawing, working, extrusion or powder metallurgy, possibly for building, machine engineering and other metallic structures. SUBSTANCE: bolt includes at least in one cross section line of section boundary. At least a part of length of line of cross section boundary is in the form of fragment or combination of fragments of oblique cone section of straight circular cone. EFFECT: constructionally caused directivity of strength properties at operation, enhanced efficiency of fixation against self-turning off, easy identification of bolt maker. 14 cl, 13 dwg