The R-SMART series linear units are particularly suitable for heavy loads, pulling and pushing very heavy weights, demanding work cycles, possible cantilever or gantry mounting, and operation in industrial automated lines. Extruded and anodized aluminum self-sustaining structure with a rectangular section, available in three sizes, from 120 to 220mm. Transmission with polyurethane steel re-enforced driving belt and features a single-rail with one or more recirculating ball bearing runner blocks. Also available with multiple sliders to further improve load capacity. These units are best used in applications requiring very heavy loads in extremely confined spaces, and where machines cannot be stopped to carry out ordinary system maintenance.