Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HCS1009-053 found under Gasket by Heatcon Composite Systems Inc. The National Stock Number assigned to this part is 5330016644940, 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 HCS1009-053.