Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31313 found under Cone And Rollers Tapered Roller by Kessler Intl Corp. The National Stock Number assigned to this part is 3110016581007, 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 31313.