Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 400639-001 found under Heat Sink Insulator by Ge Medical Systems. The National Stock Number assigned to this part is 5999013849028, 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 400639-001.