Granite Surface Plate

A granite surface plate is a precision measuring base made from natural granite, widely used in industrial settings for high-accuracy measurement, inspection, and layout operations. Thanks to its excellent physical properties and durability, the granite surface plate is an indispensable tool in quality control, metrology labs, and manufacturing environments.

Material and Structure
The surface plate is made of natural black granite, selected for its uniform grain, high density, and minimal porosity. After quarrying, the granite is carefully seasoned to eliminate internal stress and prevent deformation over time. It is then precision-machined and hand-lapped to achieve extremely flat and smooth measuring surfaces.

Key Features

• High Stability: Granite offers excellent dimensional stability with minimal thermal expansion, making it ideal for environments with fluctuating temperatures.

• Superior Hardness and Wear Resistance: With a Mohs hardness of over 6, granite is highly resistant to scratches, wear, and chemical corrosion.

• Non-Magnetic and Rust-Free: Unlike cast iron, granite does not rust and is non-magnetic, ensuring no interference with sensitive measuring tools.

• Long Service Life: Properly maintained granite plates can retain their accuracy for decades, with minimal maintenance required.

Accuracy Grades
Granite surface plates are available in different accuracy levels to meet varied application needs, including:

• Grade 3: For workshop layout and general work.

• Grade 2 and 1: For quality control rooms and inspection departments.

• Grade 0 and 00: For metrology labs and high-precision measurement.

Applications

• Inspection and layout for mechanical components

• Calibration base for height gauges, dial indicators, and coordinate measuring machines (CMMs)

• Reference surface for scribing and tooling setup

• Ideal for laboratories and precision assembly work

Optional Features
Granite surface plates can be customized with features such as T-slots, threaded inserts, leveling stands, and lifting holes, based on customer requirements.

Conclusion
Granite surface plates provide the flatness, stability, and reliability required for precision measurement. Their resistance to wear and environmental effects make them a long-term investment for ensuring consistent quality in modern manufacturing processes.