Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R6557111E8301-1 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 R6557111E8301-1.