Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HFW1003S04 found under Relay Electromagnet by Union Butterfield Corp. The National Stock Number assigned to this part is 5945005773985, 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 HFW1003S04.