Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 250-0021 found under Standoff Hex by Data I O Corp. The National Stock Number assigned to this part is 5970013262596, 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 250-0021.