Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS4120-04A found under Heat Sink Electrica by Aerospace Industries Llc. The National Stock Number assigned to this part is 5999012053101, 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 NAS4120-04A.