A waje diamita na zafi-birgima sumul bututu ne kullum fi 32mm, da bango kauri ne 2.5-200mm.A waje diamita na sanyi-birgima sumul karfe bututu iya isa 6mm, da bango kauri iya isa 0.25mm.Diamita na waje na bututu mai bango na iya kaiwa 5mm kuma kaurin bangon bai wuce 0.25mm ba.

Gabaɗaya amfani da bututun ƙarfe maras nauyi an yi shi ne da 10, 20, 30, 35, 45 da sauran ƙarfe mai ƙarfi na carbon 16Mn, 5MnV da sauran ƙananan gami da tsarin ƙarfe ko 40Cr, 30CrMnSi, 45Mn2, 40MnB da sauran kayan haɗin sanyi mai zafi ko birgima. birgima.10, 20 da sauran ƙananan carbon karfe masana'anta sumul bututu ne yafi amfani da ruwa bututu.45, 40Cr da sauran matsakaici carbon karfe sanya daga m bututu don kera inji sassa, kamar motoci, tarakta jaddada sassa.The general amfani da sumul. bututun ƙarfe don tabbatar da ƙarfin ƙarfi da gwaji.