Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4 7 1 2 5200X NO 21 found under Bearing Sleeve by Swaby Manufacturing Company. The National Stock Number assigned to this part is 3120013874086, 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 4 7 1 2 5200X NO 21.