Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST 221 3 32IN BLUE found under Insulation Sleeving Electrical by Manhattan Cdt. The National Stock Number assigned to this part is 5970008663034, 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 ST 221 3 32IN BLUE.