Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R66172C18301-1 found under Switch Thermostatic by Unifab Industries Inc. The National Stock Number assigned to this part is 5930009234176, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R66172C18301-1.