Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3A63-20 found under Test Kit Human Chorionic Gonadotropin Determinatio by Abbott Laboratories Inc. The National Stock Number assigned to this part is 6550013440485, 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 3A63-20.