Nonadecylcyclohexane is primarily used as a synthetic lubricant base stock due to its excellent thermal stability and low volatility. It is often employed in high-temperature applications, such as in industrial machinery and automotive engines, where it helps reduce friction and wear. Additionally, it serves as a key component in the formulation of greases and specialty oils, particularly for use in extreme conditions. Its chemical structure also makes it suitable for use in heat transfer fluids and as a dielectric fluid in electrical applications.