Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B55-053 found under Packing by Applied Power Products Inc. The National Stock Number assigned to this part is 5330008236042, 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 B55-053.