A granite surface plate is a precision reference measuring tool made from natural granite. It provides an ideal reference plane for inspecting instruments, precision tools, and mechanical components, especially in applications that require high-accuracy measurements.
Granite surface plates are cut from deep-earth granite deposits, naturally aged over billions of years, giving them exceptional dimensional stability. Unlike metal plates, they are unaffected by normal temperature variations, ensuring they do not deform under everyday environmental changes. The fine-grained crystalline structure and high hardness of granite make it resistant to wear and capable of maintaining precision for extended periods.
Since granite is a non-metallic material, it does not produce magnetic interference and will not undergo plastic deformation. Even when subjected to accidental impacts, the worst damage is typically the loss of a few small chips, without affecting overall accuracy.
For example, our Grade 00 granite surface plate (1000 × 630 mm) maintains its original precision even after one year of use without adjustment.
Key Features & Advantages
Exceptional Dimensional Stability – Naturally aged granite with uniform structure, extremely low thermal expansion coefficient, and no residual internal stress, ensuring long-term precision without deformation.
High Rigidity & Wear Resistance – Excellent hardness and abrasion resistance, providing a stable measuring surface over years of use.
Corrosion-Resistant & Maintenance-Free – Immune to acid and alkali corrosion, will not rust, requires no oiling, and is less prone to dust adhesion, making cleaning simple.
Scratch-Resistant & Temperature Tolerant – Resists scratches and maintains accuracy under normal workshop temperature conditions without the need for constant temperature control.
Non-Magnetic & Smooth Operation – Allows measuring tools to slide freely without sticking or drag, unaffected by humidity, and ensures consistent flatness.
Applications
Granite surface plates are widely used in:
Precision measurement and inspection
Calibration of instruments and gauges
Mechanical component testing
Layout and marking work in machining and assembly
With their high accuracy, durability, and resistance to environmental influences, granite surface plates are an essential tool for metrology labs, manufacturing plants, and precision engineering workshops.