A girder is a support beam which is used to denote the main horizontal support of a structure that supports smaller beams. Single girder cranes can be of I-beam type main girder which has a crane span of 18m(59 ft) and load up to 10 tonnes Box-type main girder which spans up to 30m (98 ft) and can uplift load up to 40 tonnes Single girder cranes cost less in many ways as only cross girders are needed; quicker installation; runway beams are lighter enough due to reduced crane dead weight.

A girder is a support beam which is used to denote the main horizontal support of a structure that supports smaller beams. Single girder cranes can be of I-beam type main girder which has a crane span of 18m(59 ft) and load up to 10 tonnes Box-type main girder which spans up to 30m (98 ft) and can uplift load up to 40 tonnes Single girder cranes cost less in many ways as only cross girders are needed; quicker installation; runway beams are lighter enough due to reduced crane dead weight.