FIELD: manufacturing technology.
SUBSTANCE: invention relates to a threaded connection which comprises a hard coating (30) formed on the surface of its part (11) with male thread, hard coating has flowability during application and curing after application. In the screwed state, gaps are provided between the flat tops (12) of the part (11) with male thread and flat depressions of the part with female thread facing each other. Tips (12) of the part (11) with male thread comprise a screw groove (40) preliminary formed therein, and specified helical groove has a lifting angle equal to the angle of lifting of the threads. Groove (40) has a maximum depth of at least 30 micron, and specified depth comprises at most one fifth of the height of the threads.
EFFECT: in this screw joint, the occurrence of jamming and an anomalous make-up torque can be prevented during screwing without compromising the strength characteristics of the screw joint.
15 cl, 1 tbl, 14 dwg
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