Precision Granite Surface Plate

Precision Granite Surface Plate is a high-precision reference tool made of premium natural granite,widely used as the core datum plane in metrology,machining,and quality inspection fields.It provides a stable,flat,and reliable reference for workpiece measurement,instrument calibration,mold assembly,and precision machining,playing an irreplaceable role in ensuring the accuracy and consistency of industrial production and quality control.

The outstanding performance of Precision Granite Surface Plate stems from the unique natural properties of high-quality granite.It features an ultra-low linear expansion coefficient,ensuring excellent dimensional stability even under temperature fluctuations in industrial workshops,which effectively avoids precision deviations caused by thermal deformation.With non-magnetic characteristics,it does not interfere with magnetic workpieces,precision electronic instruments,or magnetic measurement tools,ensuring the accuracy of inspection and measurement data.Additionally,it has high rigidity,strong wear resistance,and excellent corrosion resistance,capable of withstanding heavy loads,frequent friction,and erosion from industrial contaminants without deformation,wear,or damage.

The raw material is carefully selected dense,fine-grained natural granite(such as Jinan Black granite)with a Mohs hardness of 6–7.These granite materials undergo hundreds of millions of years of natural aging,which completely eliminates internal residual stress and ensures long-term structural stability.The manufacturing process adheres to strict precision standards,including precision cutting,multi-stage grinding,and high-precision lapping,with the entire fine processing process carried out in a constant temperature and humidity workshop to avoid precision errors caused by environmental factors.Accuracy grades are divided into 000,00,0,and 1,which can be selected according to different application scenarios,from general workpiece inspection to ultra-high-precision component calibration.

Quality inspection of Precision Granite Surface Plate strictly complies with international and national standards such as ISO 8062,GB/T 20428,and ASTM,using professional equipment such as optical flats and coordinate measuring machines(CMM)to detect surface flatness,dimensional accuracy,and structural integrity.It is widely applied in metrology laboratories,mold manufacturing,aerospace component inspection,CNC machining quality control,and electronic part measurement.Daily use requires avoiding heavy impact(granite is brittle),cleaning with neutral detergents,and placing on a vibration-isolated base to maintain its long-term precision and service life.