Air-tight threads in the oil casing industry represent a premium connection. Their core characteristics lie in achieving zero-leakage, high-pressure gas-tight sealing through a metal-to-metal seal structure, while providing connection efficiency approaching 100% of the pipe body’s strength. They can withstand complex combined loads, including tension, compression, bending, and high temperatures. Additionally, their optimized thread parameters ensure precise make-up and anti-galling performance, delivering exceptional reliability and reusability in demanding applications such as deep and ultra-deep wells.