Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 319057 found under Washer Flat by Simpson Lawrence Ltd Johnson And Evi. The National Stock Number assigned to this part is 5310012055761, 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 319057.