Castle NKM-73

The NKM-73 lock is designed to connect pipes in a tubing string to increase the period between repairs. The lock consists of a nipple and a coupling made of high-strength steels. The nipple and coupling are connected to the pipes with pipe threads, and are screwed together with wear-resistant trapezoidal-stop threads with an increased pitch. The presence of an external thrust end gives stability to the column, and the reinforced thread allows to increase the number of screwing cycles and maintain tightness after multiple assembly - disassembly operations during lowering and lifting the column. The increased channel size provides an advantage in the use of various tools for technological purposes.