Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3MB531B found under Nozzle Welding by Sulzer Metco Us Inc. The National Stock Number assigned to this part is 3433014320143, and the Federal Supply Class is 3433 Gas Welding Heat Cutting And Metalizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3MB531B.