Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BG600M331A found under Back Up Ring Prefor by Trelleborg Sealing Solutions Us Inc. The National Stock Number assigned to this part is 5330016466569, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BG600M331A.