The present invention relates to a boom element for a telescopic boom, in particular a telescopic section or a pivotal piece of a telescopic boom, wherein the boom element has a substantially box-shaped hollow structure and wherein at least one component of a pinning system is arranged in at least one of the corner edges of the box-shaped hollow structure, wherein at least one further boom element located in the boom element and/or about the boom element can be pinned to the boom element by means of the pinning system for the purpose of fixing, and wherein the component of the pinning system is and/or includes at least one pin mount and/or at least one pin guide in which the at least one pin is guided and/or movable.