Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H5471903-018 found under Nrp Retainer Bearing by Electric Boat Corp. The National Stock Number assigned to this part is 3120016040319, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H5471903-018.