Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number APTEK 2100-A7C B (SEM found under Insulating Compound Kit Electric by Applied Technology. The National Stock Number assigned to this part is 5970015194294, 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 APTEK 2100-A7C B (SEM.