Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R12-12012X4E1 found under Relay Electromagnet by Tyco Electronics Corporation. The National Stock Number assigned to this part is 5945011239873, 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 R12-12012X4E1.