Granite Surface Reference Plate

UNPARALLELED LTD is one of the leading manufacturers and suppliers of granite surface reference plate in China. With abundant experience, we warmly welcome you to buy advanced granite surface reference plate made in China here from our factory. We also accept custom orders.

The UNPARALLELED® Granite Surface Reference Plate is manufactured from our exclusive UNPARALLELED® black granite, a high-density natural stone with exceptional stability and wear resistance. With a density of approximately 3100 kg/m³, it surpasses traditional European and American black granites in both physical and mechanical performance. Each plate is carefully machined and hand-lapped by our skilled craftsmen to achieve ultra-flatness and long-term dimensional stability.

UNPARALLELED® Granite Surface Reference Plate serve as the foundation of precision measurement, providing a stable reference surface for dimensional inspection, calibration, and equipment assembly in high-precision industries.

• Superior Material Quality

Made from UNPARALLELED® black granite - dense, uniform, non-porous, and free of internal stress. It resists warping, corrosion, and thermal expansion better than cast iron or marble alternatives.

• Exceptional Flatness Accuracy

Achievable flatness up to 0.001 mm/m (1 µm per 1000 mm), verified with electronic levels and laser interferometers traceable to national metrology institutes.

• Excellent Wear Resistance

The natural hardness of granite ensures minimal surface wear, maintaining precision for years of continuous use.

• Thermal Stability

Granite's low thermal expansion coefficient guarantees consistent accuracy under varying temperatures - ideal for temperature-controlled environments.

• Non-Magnetic and Rust-Free

Perfect for applications where magnetic interference or rust contamination is unacceptable, unlike traditional cast iron plates.

• High Load Capacity

Engineered structures support heavy measuring instruments and machine assemblies with minimal deflection.

UNPARALLELED® granite surface plates are widely used across metrology laboratories, semiconductor manufacturing, precision machining, optical inspection, and scientific research.
Typical applications include:

• CMM (Coordinate Measuring Machine) reference base
• Inspection and calibration benches
• Precision laser and optical equipment foundation
• Tool and gauge measurement reference
• Machine assembly and accuracy alignment platform

Every granite surface plate is produced in our ISO 9001, ISO 14001, ISO 45001, and CE certified facilities.
All products are inspected using advanced metrology equipment, including Renishaw laser interferometers, WYLER electronic levels, and Mahr indicators, ensuring traceability to national standards.
Each plate is supplied with a calibration certificate issued by an authorized metrology institute.

To maintain long-term precision:

• Clean regularly using a lint-free cloth and mild solvent to remove dust or oil.
• Avoid localized loading; distribute weight evenly across the plate.
• Protect from impact and prevent sharp objects from scratching the surface.
• Cover when not in use to prevent contamination from dust or moisture.
• Recalibrate periodically, depending on usage frequency and accuracy requirements.

Proper care ensures your UNPARALLELED® granite surface plate retains its ultra-flatness and performance for decades.

• Over 20 international patents and trademarks registered in the EU, US, and Asia
• Global clients including GE, Samsung, Oracle, Apple, Bosch, and THK
• Two advanced factories covering 200,000 m², equipped with Taiwan Nantong grinders (6000 mm capacity)
• Cooperation with top universities and metrology institutes worldwide

UNPARALLELED® has become the industry benchmark in precision granite manufacturing - where precision, reliability, and integrity converge.

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