They are idle steering axles for high loading capacities, higher than 8 tons. The design of these products takes into account of the severe working conditions to which the components are subjected. The structural dimensionings are fundamental in order to obtain robustness, duration and low production costs, optimizing the shape, the thicknesses and the weight of the carrying structure. The axles can be equipped with disc or drum brake. Several possibilities for the design of the attachment to the chassis are moreover available.