Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H677-2201-640 found under Shielding Gasket El by Electric Boat Corporation. The National Stock Number assigned to this part is 5999014982225, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H677-2201-640.