Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS 1099-18 found under Washer Bevel by National Aerospace Standards. The National Stock Number assigned to this part is 5310012846395, 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 NAS 1099-18.