Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NS4-12 found under Nut Tube Coupling by Kerotest Manufacturing Corp. The National Stock Number assigned to this part is 4730005857316, 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 NS4-12.