Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K731011-21N8 found under Nut Plain Hexagon by Crane Company. The National Stock Number assigned to this part is 5310008808189, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K731011-21N8.