LAMINATE BOLT Russian patent published in 1999 - IPC

FIELD: manufacture of fastening products, possibly for building, machine engineering and other structures. SUBSTANCE: laminate bolt includes at least two subareas of materials. At least a part of line of cross section boundary and(or) at least a part of line of boundary of material subareas is in the form of fragment 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, high corrosion resistance, easy identification of bolt maker. 16 cl, 16 dwg