Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS591 found under Inverted Nut Tube C by National Aerospace Standards. The National Stock Number assigned to this part is 4730006188507, 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 NAS591.