Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 51X5 found under Solenoid Tray Actua by United States Postal Service. The National Stock Number assigned to this part is 5945001340834, 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 51X5.