The flatness of the surface is often a major factor in the positioning accuracy and repeatability of a motion system. The polished granite surfaces are among the flattest and commercially available structures. Granite’s tight flatness tolerance and extreme hardness make it an attractive option to complement Newport’s Ultra-Precision Linear Motor XM series stage. The GB series granite base plates provide the surface flatness within 2 μm and feature 3 point mounting, to make-up for non-flat tables. Edge handles facilitate handling and locating the base plate on the work surface. English table only. Call for metric version.