Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NN-13-BK found under Nut Self Locking Hexagon by Sealcon Limited Liability Company. The National Stock Number assigned to this part is 5310015115642, 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 NN-13-BK.