Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A2057 found under Relay Electromagnet by Aeronautical Communications. The National Stock Number assigned to this part is 5945006646668, 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 A2057.