Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MD5306-3SS found under Thread Piece Union by B E C Systems Inc. The National Stock Number assigned to this part is 4730013188543, 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 MD5306-3SS.