Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS20500-428 found under Nut Self Locking Hexagon by Tecno Trade S R L. The National Stock Number assigned to this part is 5310002982747, 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 MS20500-428.