Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3R409 found under Bearing Ball Annular by Grainger Div Of W W Grainger Inc. The National Stock Number assigned to this part is 3110011685460, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3R409.