Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FWS0604 found under Washer Flat by Sei Industries Ltd. The National Stock Number assigned to this part is 5310200047926, 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 FWS0604.