Tsawon isar da bututun bakin karfe kuma ana kiransa tsayin da mai amfani ya nema ko tsawon kwangilar.Akwai dokoki da yawa don tsayin bayarwa a cikin ƙayyadaddun bayanai:

A. Tsawon al'ada (wanda kuma aka sani da tsayin da ba a kayyade): Duk wani bututu mai bakin karfe wanda tsayinsa yana cikin ma'auni na tsayin ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun buƙatun kuma ba tare da ƙayyadadden buƙatun buƙatun ba ana kiran tsayin al'ada.Alal misali, tsarin ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun bututu: zafi-birgima (kneaded, faɗaɗa) bututun ƙarfe 3000mm ~ 12000mm;sanyi kõma (birgima) karfe bututu 2000mm ~ 10500mm.

B. Tsawon yanke-zuwa-tsawon: Tsawon yanke-zuwa-tsawon ya kamata ya kasance a cikin ma'aunin tsayin da aka saba, wanda aka nema a cikin kwangilar ƙayyadaddun ƙayyadaddun tsayin tsayi.Duk da haka, a aikace, ba shi yiwuwa a tabbatar da cewa an ƙayyade tsayin tsayin daka.Sabili da haka, ƙimar kuskuren tabbatacce wanda aka ba da izinin ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun.

C. Tsawon ƙafafu da yawa: Tsawon ƙafafu da yawa ya kamata ya kasance cikin ma'aunin tsayin da aka saba.Ya kamata kwangilar ta nuna tsayin ƙafafu ɗaya da maɗaukaki na jimlar jimlar (misali, 3000mm × 3, wanda shine nau'i na 3 na 3000mm, kuma tsayin duka shine 9000mm).A aikace, jimlar tsawon ya kamata a ƙara tare da kuskuren kuskure na 20mm, tare da raguwar yankan ya kamata a bar shi don kowane tsayin mai mulki guda ɗaya.Ɗaukar tsarin bututu azaman misali, ƙa'idar ita ce barin izinin yankewa: diamita na waje ≤159mm shine 5 ~ 10mm;m diamita> 159mm ne 10 ~ 15mm.

D. Tsawon sikelin: tsayin ma'auni na bututun bakin karfe yana cikin ma'aunin tsayin da aka saba, lokacin da mai amfani ya buƙace shi Lokacin da aka saita takamaiman tsayin ma'auni, za a nuna shi a cikin kwangilar.

Ana iya ganin tsayin sikelin ya fi sauƙi fiye da ƙayyadaddun tsayi da buƙatun tsayi biyu, amma ya fi tsayi fiye da tsayin da aka saba, wanda kuma zai haifar da raguwar yawan amfanin da kamfanin ke samarwa.Sabili da haka, yana da ma'ana ga kamfanin samarwa don haɓaka farashin.Juyin haɓakar farashin yawanci kusan 4% na farashin tushe ne.