Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A-424-5 MODEL 496 found under Radioactive Test Sample by Qsa Globalinc. The National Stock Number assigned to this part is 6665013776267, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A-424-5 MODEL 496.