Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number STHC440-9 found under Nut Plain Hexagon by Standard Insert Co Inc. The National Stock Number assigned to this part is 5310002466366, 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 STHC440-9.