Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MAG5664-189 found under Bearing Assembly Bo by Speco Corp. The National Stock Number assigned to this part is 3120000219965, 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 MAG5664-189.