Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4369-0057 found under Nut Self Locking Plate by Bae Systems Information And Electronic Systems Integration Inc. The National Stock Number assigned to this part is 5310007723721, 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 4369-0057.