Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AHT642-4 found under Release Cartridge D by Aerial Machine And Tool Corp. The National Stock Number assigned to this part is 1680006590720, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AHT642-4.