Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AP50N-4 found under Sleeve Flared Tube Fitting by Sps Technologies Inc. The National Stock Number assigned to this part is 4730004278692, 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 AP50N-4.