A cikin masana’antar ƙera bututun ƙarfe, ɓangaren giciye na bututun yawanci yana nufin siffar hazo na ruwa wanda bututun ya fesa, wanda aka yanke shi a cikin madaidaiciyar madaidaicin feshin bututun, kuma an yanke feshin .

Misali, a cikin hoton da ke sama, siffar giciye na bututun fan ɗin lebur shine siffar zaitun tare da siririn ɓangarori da ɗan faɗin tsakiya. Fahimtar nau’ikan nau’ikan bututun ƙarfe ya fi dacewa da mu zaɓin bututun da ya dace.

Misali, idan kuna buƙatar tsaftace abubuwan da ke kan bel ɗin jigilar kaya, kun dace da zaɓar bututun bututu mai ɗorewa, saboda wannan nau’in bututun ƙarfe na iya haifar da babban tasiri kuma yana da sauƙin tsaftace datti a saman abin. Amma nisan shigarwa, tsayin shigarwa da allurar feshin bututun Duk suna buƙatar ƙididdiga, zaku iya tuntuɓar mu don takamaiman hanyoyin ƙididdiga.

Sashin giciye na cikakken mazugi shine madaidaiciyar da’irar, sashin giciye na square. bututun ƙarfe murabba’i ne, sashin gicciye na bututun bututun bututun ƙarfe shine elliptical, sashin giciye na bututun bututun bututun yana da toroidal, da dai sauransu, cikakken fahimtar bututun kawai Ta hanyar feshin siffar giciye, zaku iya zaɓar mafi kyau bututun da ya dace da ku.