Wear-resistant Lock for Drill Pipes NKT-73 (Coupling-Nipple) for Oil Well Repairs

The locks are designed for repair and technological needs during oil well workover, for assembly of technological columns. Threads of the nipple and coupling are made with hardening in the part that mates with each other and is constantly subjected to screwing and unscrewing during assembly and disassembly of the string, which increases the service life of threaded joints.