A U-bolt ndi bawuti momwe kalata U imakhala ndi ulusi pazomaliza zonse ziwiri. Carbon iron U bolt limatanthauzira bwino kuti zinthu zomwe zili m'bulamu ndi chitsulo cha kaboni.
Carbon iron U bolt wayigwiritsa ntchito makamaka kuthandiza njomba, mapaipi omwe madzi ndi magalasi amadutsa. Mwakutero, mabatani achitsulo a kaboni anali kuyesedwa pogwiritsa ntchito uinjiniya wa bomba. U-bolt wazitsulo ungafotokozeredwe ndi kukula kwa chitoliro chomwe anali kuchirikiza. U-bolt wa kaboni umagwiritsidwanso ntchito kumangira zingwe pamodzi.