Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AZ420-21-4H found under Relay Assembly by American Zettler Inc. The National Stock Number assigned to this part is 5945016476126, and the Federal Supply Class is 5945 Relays And Solenoids. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AZ420-21-4H.