Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40320-1 found under Insulationthermalspecial Purpo by Arrowhead Products Corporation. The National Stock Number assigned to this part is 5330001309519, 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 40320-1.