Daidaitaccen bututun ƙarfe shine nau'in babban kayan bututun ƙarfe bayan zane mai sanyi ko birgima mai zafi. Saboda fa'idodin babu wani bututun oxide akan bangon ciki da waje na madaidaicin bututun ƙarfe, babu ɓarna a ƙarƙashin babban matsin lamba, madaidaicin madaidaici, babban ƙarewa, babu nakasa yayin lanƙwasa sanyi, babu faɗaɗawa, shimfidawa kuma babu fashewa, galibi ana amfani dashi don samar da abubuwan pneumatic ko hydraulic, kamar silinda na iska ko silin mai, wanda zai iya zama bututu mara kyau ko bututu mai walƙiya.