Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X3431 found under Bearing Roller Cylindrical by Koehring Co. The National Stock Number assigned to this part is 3110001817790, 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 X3431.