Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 47B MLB-561-020 ITEM 23 found under Bearing Sleeve by Textron Marine Systems. The National Stock Number assigned to this part is 3120014698793, 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 47B MLB-561-020 ITEM 23.