Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5012B found under Heat Sink Electrical Electronic by Aavid Thermalloy Llc. The National Stock Number assigned to this part is 5999012492738, 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 5012B.