Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 490559 found under Plate Retaining Bearing by National Aerospace. The National Stock Number assigned to this part is 3110009120648, 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 490559.