Thermocouples with lead wire mounted inside a stainless steel washer housing. Easily bolt to surfaces to measure temperature. Washer bolt thermocouples are used as temperature sensors to measure the temperature of the liquid in process lines. They allow continuous monitoring of temperature and provide an accurate indication of the level of heat transfer between the product and the surrounding environment. The thermal sensor can be installed directly into the vessel or pipe that contains the fluid, or it may be embedded in the wall of piping.