Kalmar “kingbolt” yawanci tana nufin wani babban kusoshi a tsaye wanda ke kiyaye gatari na gaba na abin hawa ko keken keke zuwa firam ɗin abin hawa. Har ila yau, a wasu lokuta ana amfani da shi don bayyana maƙallin tsakiya ko maɓalli a cikin tsarin.
