Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 633 4559 001 found under Heat Sink Electrica by Rockwell Collins Inc. The National Stock Number assigned to this part is 5999012697986, 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 633 4559 001.