Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4381 found under Relay Electromagnet by Rowan Bmi Corp. The National Stock Number assigned to this part is 5945005189971, 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 B4381.