Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BACSI3Z4 found under Sleeve Flared Tube Fitting by The Boeing Company. The National Stock Number assigned to this part is 4730002780678, 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 BACSI3Z4.