Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N5 31 12 found under Washer Lock by Bofors A B. The National Stock Number assigned to this part is 5310121443934, 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 N5 31 12.