UNPARALLELED LTD is one of the leading manufacturers and suppliers of metrology equipment in China. With abundant experience, we warmly welcome you to buy advanced metrology equipment made in China here from our factory. We also accept custom orders.
In the world of ultra-precision manufacturing and metrology, stability is not a feature-it's the foundation. At UNPARALLELED Group, we don't just manufacture granite surface plates; we engineer the bedrock upon which accuracy is built. Our UNPARALLELED® black granite surface plate is not merely a tool-it's a promise of integrity, precision, and performance that stands unmatched in the industry.
Crafted from our proprietary high-density black granite (≈3100 kg/m³), this surface plate delivers exceptional dimensional stability, minimal thermal expansion, and superior vibration damping-qualities that far exceed those of conventional marble or lower-grade granite. While others cut corners, we stand firm: No cheating. No concealment. No misleading. This is the UNPARALLELED® standard.
quality control
Why UNPARALLELED® Granite Surface Plates Are the Gold Standard
Uncompromising Material Quality
We use only UNPARALLELED® black granite, with a density of ≈3100 kg/m³-significantly higher than standard granite or marble. This ensures:
- Near-zero moisture absorption
- Exceptional resistance to warping and deformation
- Superior wear resistance and longevity
Unlike inferior alternatives, our granite undergoes rigorous aging and stress-relief processes to guarantee long-term dimensional stability.
Precision Beyond Tolerance
Our surface plates are precision-lapped to achieve flatness down to the nanometer level, meeting or exceeding international standards such as:
- DIN 876 Grade 00
- ASME B89.3.7
- JIS B 7411
- GB/T 20428
Each plate is calibrated using Swiss WYLER electronic levels and Renishaw laser interferometers, with traceable certification from provincial and national metrology institutes.
Engineered for Real-World Performance
Whether used as a standalone inspection table or integrated into complex systems, our granite plates provide:
- Vibration damping for stable measurements
- Thermal inertia to resist ambient temperature fluctuations
- Non-magnetic and non-conductive properties-ideal for sensitive electronics and semiconductor applications
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | UNPARALLELED® High-Density Black Granite |
| Density | ≈3100 kg/m³ |
| Flatness Accuracy | Up to ±0.5 µm (Grade 00) |
| Surface Finish | Precision Lapped, Matte Gray |
| Available Sizes | Custom up to 20,000 mm × 4,000 mm × 1,000 mm |
| Standards Compliance | DIN 876, ASME, JIS, GB, BS 817 |
| Calibration | Traceable to National Metrology Institute |
| Applications | CMM, SEMI, PCB drilling, AOI, CT, laser systems |
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Real-World Applications & Customer Benefits
Our granite surface plates are trusted by global leaders in precision engineering, including Samsung, Bosch, ZEISS, and national metrology institutes. They serve as the foundational reference in:
- Semiconductor manufacturing – for wafer stage alignment and lithography tool calibration
- Coordinate Measuring Machines (CMM) – as stable, vibration-free bases
- Precision assembly – for aerospace, optics, and medical devices
- Calibration labs – as primary reference planes for gauge blocks and instruments
You gain:
- Reduced measurement uncertainty
- Longer equipment lifespan
- Fewer recalibrations and downtime
- Confidence in every micron of precision
certificates
FAQ
Q: Why choose black granite over marble for a surface plate?
A: Black granite has higher density, lower porosity, and better thermal stability than marble. It resists chipping, absorbs less moisture, and maintains flatness over decades-critical for ultra-precision work.
Q: Can you customize the size and mounting features?
A: Absolutely. We manufacture monolithic plates up to 20 meters in length and can integrate T-slots, threaded inserts, or precision locating features per your design.
Q: Is calibration included?
A: Yes. Every plate comes with a full calibration certificate traceable to national standards. We also offer on-site verification services.
Q: How do you ensure flatness over large areas?
A: Using our 6-meter CNC precision grinders and manual lapping by master technicians with over 30 years of experience-our team can "feel" deviations down to 1 micron.
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