FIELD: construction.
SUBSTANCE: on the entire length of useful thread there are two or more turns of the complete variation curved thread, in which tension along the average diameter of turns for specified value of fit tension is more than tension along the average diameter of turns of the appropriate reference standard conical thread. The side of the variation bent thread profile is a bent arched surface. The invention also relates to methods and devices for manufacturing of the external thread of the input pipeline, made as capable of tight fit, and also to the pair of fittings with thread of the input pipeline, made as capable of tight fit.
EFFECT: production of a tight threaded joint without usage of seals.
12 cl, 14 dwg
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