Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 25A55031 found under Heat Sink Electrical Electronic by Critical Power Systems Inc. The National Stock Number assigned to this part is 5999013639513, 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 25A55031.