Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 120-31005052 found under Nut Plain Hexagon by Atlas Copco. The National Stock Number assigned to this part is 5310016020774, 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 120-31005052.