Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R10 E4 Y2 S3 2K found under Relay Electromagnet by The Boeing Company. The National Stock Number assigned to this part is 5945011074654, 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 R10 E4 Y2 S3 2K.