Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7H538 found under Packing Preformed by Caterpillar Inc. The National Stock Number assigned to this part is 5330007083855, 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 7H538.