Granite Surface Plate

A granite surface plate,also referred to as a granite inspection plate or marble surface plate,is a high-precision reference tool widely used in industrial measurement,precision machining,and quality inspection.It is crafted from high-quality natural granite,typically Jinan Black granite,which undergoes rigorous processing procedures including CNC cutting,rough grinding,fine grinding,hand lapping,and strict precision calibration to meet various industrial accuracy requirements.

The core advantage of a granite surface plate lies in its excellent physical and mechanical properties.Formed by natural geological processes over hundreds of millions of years,the dense crystalline structure of granite eliminates internal stress,ensuring exceptional dimensional stability and no deformation over long-term use.It boasts a high Mohs hardness(6-7),superior wear resistance,and a super-smooth surface with a roughness(Ra)as low as 0.02μm for high-grade models,providing a reliable flat reference plane.

Unlike traditional cast iron plates,granite surface plates are non-magnetic,corrosion-resistant,and have a low linear thermal expansion coefficient,effectively avoiding magnetic interference,rust,and dimensional drift caused by temperature changes.They require minimal maintenance—only regular wiping with a lint-free cloth to keep the surface clean and free of debris.

Available in precision grades(000,00,0,1)and customizable sizes,from small benchtop plates to large industrial worktables,granite surface plates are essential in aerospace,semiconductor,automotive manufacturing,mold verification,and laboratory research.They serve as the foundation for coordinate measuring machines(CMM),tool calibration,and precision assembly,guaranteeing accurate and consistent results in critical industrial processes.