Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 63A124D2019 found under Heat Exchanger by Leidos Inc. The National Stock Number assigned to this part is 2520009996498, 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 63A124D2019.