The present invention relates to a tensioner for an endless drive, in particular an internal combustion engine, the tensioner having a base part and a tensioning part rotatable relative thereto, a spring element arranged in a force-exerting manner between the base part and the tensioning part and a friction device provided between the spring element and the base part or the tensioning part with which the relative movement between the base part and the clamping part is damped. In order to improve a generic tensioner so that a simple structure is possible with good damping, it is proposed to arrange the friction device radially outside of the spring element.
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