Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MBB-2720A found under Bearing Washer Thrust by Sunnen Products Company. The National Stock Number assigned to this part is 3120012658878, 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 MBB-2720A.