For critical positioning applications requiring tight positioning accuracy and repeatability of a motion system, flatness of the mounting surface becomes a major factor. Polished granite surfaces are among the flattest, commercially available structures. Granite’s tight flatness tolerance and extreme hardness make it an attractive option to complement Newport’s Ultra-Precision XM Series Linear Motor Stages. The GB series granite base plates provide the surface flatness within 2 μm and feature 3 point mounting, to compensate for non-flat tables. Edge handles facilitate handling and locating the base plate on the work surface. Can be mounted on English and metric tables.