Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4670.016 found under Washer Flat by Engine Power Inc. The National Stock Number assigned to this part is 5310013343502, 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 4670.016.