Kunezinhlobo eziningi zezikulufu ezihlanganisiwe, ezihlanganisa izikulufu ezimbili ezihlanganisiwe nezikulufu ezintathu ezihlanganisiwe (iwashi eyisicaba kanye newasha yasentwasahlobo noma iwasha eyisicaba ehlukile newasha yasentwasahlobo) ngokuya ngohlobo lwezesekeli ezihlanganisiwe;Ngokusho kohlobo lwekhanda, ingabuye ihlukaniswe ngezikulufu zenhlanganisela yekhanda le-pan, izikulufa zenhlanganisela yekhanda eliphikisayo, izikulufa zenhlanganisela yangaphandle ye-hexagonal, njll;Ngokusho kokuqukethwe, ihlukaniswe nge-carbon steel, insimbi engagqwali ne-alloy steel (iBanga 12.9).