FIELD: sealing screw pairs built of two threaded parts. SUBSTANCE: sealing screw pair used for transmitting axial forces has two mating threaded parts in which thread turns are filled with sealing compound. At least one threaded part has cylindrical threaded section and non-cylindrical one throughout entire axial length of its thread; when two threaded parts mate at axial longitudinal area of non- cylindrical section, opposite sides of thread profile of non-cylindrical section and of threaded section of mating part come in linear contact at point of maximal diameter of non-cylindrical section with radial displacement stress built up between thread profile sides. This radial displacement stress can ensures both locking of parts on sides of thread profile, in which case sides of thread profile provided in thread turns on cylindrical threaded section of threaded part and cylindrical thread of mating part are loosely disposed in a spaced relation, and permanent turning of threaded parts on axial locating section up to end stop of locking guide part or up to end stop of locking part base. In this way both sides are press-fitted into sealing compound due to clearance between thread profile sides. As a result we may have axial positioning pair and turning screw pair. EFFECT: enhanced stiffness of threaded joint. 4 cl, 2 dwg
