Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 137618599 found under Elbow Boss by Oto Melara Spa. The National Stock Number assigned to this part is 4730009290600, 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 137618599.