👉 A tie fluid, also known as a tie lubricant or thread sealant, is a specialized lubricant used in mechanical engineering to reduce friction and wear between threads of mating parts, particularly in high-torque applications like engines, pumps, and gearboxes. Typically made from silicone-based compounds or fluorocarbon polymers, it forms a thin, protective film that prevents metal-to-metal contact, thereby minimizing heat generation and extending the lifespan of the components. This fluid is crucial in maintaining smooth operation and reducing noise, especially under extreme conditions where conventional lubricants might fail.