Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K663170081 found under Screw Externally Relieved Body by F E L Corp. The National Stock Number assigned to this part is 5305000573011, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K663170081.