Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3034-B-256-B-5 found under Reducer Boss by R A F Electronic Hardware Inc. The National Stock Number assigned to this part is 4730008041906, 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 3034-B-256-B-5.