Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AT2E-1639-1 found under Switch Sensitive by Accutemp Products Inc. The National Stock Number assigned to this part is 5930004639625, 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 AT2E-1639-1.