FIELD: soil or rock drilling.
SUBSTANCE: invention relates to tubular element of drilling rod. Tubular element comprises end part with axis of rotation and threaded passing around axis of rotation. End part can be connected by means of screwing to the corresponding end part of the other tubular element equipped with complementary thread. End part contains at least one external stop, which is made with possibility to contact with the corresponding external stop of the other element at completion of screwing, and the thread-free surface. Said outer support comprises at least one helical surface having axis of helical line that coincides with axis of rotation. Thread-free surface is located between screw surface and thread.
EFFECT: increase of rated torque of attachment and provision of connection sealing during repeated screwing-unscrewing operations.
14 cl, 12 dwg, 1 tbl
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