Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4X1-8 found under Insulator Bushing by Product Components Corporation. The National Stock Number assigned to this part is 5970009355026, 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 4X1-8.