Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6440103 found under Parts Kit Universal Joint by E D Etnyre And Co. The National Stock Number assigned to this part is 2520002179322, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6440103.