Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 640328-14A1-4 found under Track Switch Assemb by Pollak Corp. The National Stock Number assigned to this part is 5930001068950, 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 640328-14A1-4.