Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K1031 4 found under Nut Self Locking Pl by Fairchild Corp. The National Stock Number assigned to this part is 5310997118104, 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 K1031 4.