Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EB 4178 5 found under Processor Audio by Electric Boat Corporation. The National Stock Number assigned to this part is 5998015419236, and the Federal Supply Class is 5998 Electrical And Electronic Assemblies Boards Cards And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EB 4178 5.