Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DLG21916F0504 found under Reducer Boss by Precision Form Rivet Inc. The National Stock Number assigned to this part is 4730006838872, 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 DLG21916F0504.