Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MIL-F-5509 found under Adapter Straight Fl by Federal Specifications. The National Stock Number assigned to this part is 4730002896119, 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-5509.