Threaded drilling rod screw joint - has conical male connector with generatrices inclined by less than 3 deg. and helical thread inclined by less than half that angle

摘要

A threaded screw joint for drilling rods has a threaded conical male section at the end of one rod with generatrices inclined by less than 3 deg., a helical thread on the section induced by less than twice that angle, a double stop on the male section, and a corresponding conical threaded female section.