Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5519 found under Bearing Roller Thrust by Porter H K Co Inc. The National Stock Number assigned to this part is 3110001170763, 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 5519.