Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MIL-F-18866 found under Adapter Straight Tu by Air Corps Standards. The National Stock Number assigned to this part is 4730012970213, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MIL-F-18866.