Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 266-6843-640 found under Push Button by Alcatel Usa Inc. The National Stock Number assigned to this part is 5930000174884, 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 266-6843-640.