Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11-21-21970-001 found under Switch Rotary by Electro Switch Corp. The National Stock Number assigned to this part is 5930010498273, 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 11-21-21970-001.