Izinsimbi zesigaba C zicutshungulwa ngeshidi lensimbi eligoqelwe ngokushisayo futhi likhishwa ngokubanda kusetshenziswa insimbi enamandla amakhulu ukuze kuncishiswe isisindo ngenkathi kukhulisa umthamo wesigaba ngasinye.Asetshenziselwa uphahla kanye ne-purline yodonga ukuze kusekelwe uphahla kanye nokuvala udonga.Qhathanisa nensimbi yesiteshi, amafreyimu ensimbi esigaba C angonga u-30% wokumosheka kwezinto ezibonakalayo, futhi anodonga oluncane oluncane, isisindo esilula, ukusebenza kahle kwesigaba nezici zamandla aphezulu. Insimbi engu-C icutshungulwa ngokuzenzakalelayo futhi yakhiwe umshini wokwenza insimbi omise okwe-C.Umshini wokwenza insimbi omise okwe-C ungaqedela ngokuzenzakalelayo inqubo yokwenza insimbi engu-C ngokuya ngosayizi wensimbi onikeziwe u-C.
I-C section steel purlins ihlukaniswe yaba yizicaciso ze-120,140,160, 180, 200,220,250 nokunye ngokusho kokuphakama.Ubude bunganqunywa ngokuya ngomklamo wobunjiniyela, kodwa uma kucatshangelwa izimo zokuhamba nokufakwa, ubude obuphelele ngokuvamile abudluli amamitha ayi-12.
| Ukucaciswa kwensimbi kwesigaba C | |||||
| Imodeli No. | H×B×C(mm) | Ubukhulu(mm) | Ibanga lembobo(mm) | Ubude(mm) | |
| C120 | 120×50×20 | 3.0 | Kuyalungiseka | Ubukhulu obungu-5.8m ku-20GP; 11.8m kwe-40GP/HQ | |
| C140 | 140×50×20 | 2.0-2.5 | Kuyalungiseka | ||
| C160 | 160×60×20 | 2.0-3.0 | Kuyalungiseka | ||
| C180 | 180×70×20 | 2.0-3.0 | Kuyalungiseka | ||
| C200 | 200×70×20 | 2.0-3.0 | Kuyalungiseka | ||
| C220 | 220×75×20 | 2.0-3.0 | Kuyalungiseka | ||
| C250 | 250×75×20 | 2.0-3.0 | Kuyalungiseka | ||
