Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NC1909-4 found under Locknut Pipe by Diamond Power International Inc. The National Stock Number assigned to this part is 4730001740166, 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 NC1909-4.