Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D99-4260 found under Washer Flat by Hayes Diversified Technologies Inc. The National Stock Number assigned to this part is 5310015466762, 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 D99-4260.