Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 65671 found under Nut Castellated by Hydro Test Products Inc. The National Stock Number assigned to this part is 5310012064921, 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 65671.