ARCO is an automatic chain/belt tensioner which has a rotational functioning.
The elastic movement is created by a zinc-plated spiral spring which is conveniently guided when subjected to flex/torsional stresses. This feature gives to it a high reaction index and a good constant in the ratio between rotation angle / developed load.
Since ARCO is made completely of zinc-plated steel, it can be used even in extreme conditions such as high temperatures (around +300°) and low temperatures (around -50°).
ARCO is available in two different versions with two different maximum rotation angles: ±40° and ±90° from its resting position.