Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AV71-019 IT 4 found under Insulator Washer by Automatic Switch Company. The National Stock Number assigned to this part is 5970006698823, 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 AV71-019 IT 4.