Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PES0-4009 found under Insulator Stqasoff by Navy Electronics Supply Office. The National Stock Number assigned to this part is 5970008293494, and the Federal Supply Class is 5970 Electrical Insulators And Insulating Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PES0-4009.