Kusurwar Karfe Bar, wanda aka fi sani da Angle iron, dogon tsiri ne na ƙarfe wanda yake daidai da juna kuma yana kusurwa. Akwai kusurwoyi daidai da kusurwoyi marasa daidaito. Gefen biyu na Angle mai daidaito daidai suke a faɗin. Ana bayyana ƙayyadaddun bayanansa a cikin milimita na faɗin gefe × faɗin gefe × kauri gefe. Misali, ∟30 x 30 x 3 yana nuna daidai ƙarfe mai kusurwa tare da faɗin 30 mm da kauri 3 mm. Hakanan ana iya wakilta shi da lambar samfurin, wanda shine adadin santimita na faɗin gefe, kamar ∟3#. Samfurin bai nuna girman kauri daban-daban na gefe a cikin samfurin iri ɗaya ba, don haka girman faɗin gefe da kauri na gefen ƙarfe na Angle cikakke ne a cikin kwangilar da sauran takardu, don guje wa wakilcin samfurin kawai. Takaddun ƙarfe masu kama da juna masu zafi suna 2#-20#. Ana iya haɗa ƙarfe mai kusurwa da abubuwan damuwa daban-daban bisa ga buƙatun tsarin daban-daban, kuma ana iya amfani da shi azaman haɗi tsakanin abubuwan. Ana amfani da shi sosai a cikin gine-gine da gine-ginen injiniya daban-daban, kamar katako, gadoji, hasumiyoyin watsa wutar lantarki, injunan ɗagawa da jigilar kaya, jiragen ruwa, tanderun masana'antu, hasumiyoyin amsawa, wuraren ajiye kwantena da rumbunan ajiya.