Ultra-Precision Granite Surface Plate

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

✅ Material: UNPARALLELED® Black Granite (density ≈3100 kg/m³)

✅ Flatness Grades Available:

Grade AA (Laboratory Grade): ≤ (4 + L/250) µm

Grade A (Inspection Grade): ≤ (8 + L/250) µm

Custom grades down to < 1 µm over 500 mm for semiconductor & optics applications

✅ Thermal Stability: Coefficient of thermal expansion as low as 6.5 × 10⁻⁶ /°C

✅ Non-Magnetic & Chemically Inert – Safe for cleanrooms, electron microscopes, and sensitive instruments

✅ Vibration-Damping Properties – Superior to cast iron or steel bases

✅ Compliance: Meets DIN 876, ASME B89.1.5, JIS B 7502, ISO 8512-2, and GB/T 6092

Each plate undergoes multi-stage grinding on Taiwan Nanter ultra-precision grinders (investment > $500,000/unit), followed by manual lapping in our 10,000 m² (constant temperature & humidity) metrology workshop - built with 1-meter-thick military-grade concrete floors and surrounded by 500mm-wide anti-vibration trenches.

Our Ultra-Precision Granite Surface Plate serve as the gold standard in environments where error is not an option:

🔬 Metrology & Calibration Labs – Primary reference for CMMs, optical flats, and gauge blocks

🧪 Semiconductor Manufacturing – Base for wafer inspection, lithography alignment, and probe stations

⚙️ Aerospace & Defense – Assembly and verification of turbine blades, guidance systems, and avionics

🔋 EV & Battery R&D – Stable platform for electrode coating analysis and cell stacking

📐 Precision Machining Shops – Setup surface for tooling, jig alignment, and first-article inspection

🏛️ National Metrology Institutes – Including partners in the UK, France, Russia, and Singapore

Trusted by Bosch, Siemens, Samsung, Apple supply chain partners, and research powerhouses like Nanyang Technological University and Chinese Academy of Sciences.

A granite surface plate can last decades - even generations - with proper care:

• Clean Daily – Wipe with lint-free cloth and isopropyl alcohol or mild soapy water. Never use acetone or abrasives.
• Avoid Overloading – Distribute weight evenly; never place sharp or heavy objects directly without protective pads.
• Use Proper Tools Only – Keep hardened steel tools off the surface; use ceramic or carbide-tipped instruments when possible.
• Store Covered – Use a fitted dust cover when idle to prevent airborne particle accumulation.
• Re-Certify Annually – We recommend recalibration using laser interferometry or electronic levels (e.g., Wyler) to maintain traceability.

All UNPARALLELED surface plates include a calibration certificate issued by Shandong Provincial Institute of Metrology, with full NMI traceability.

We are the only global manufacturer holding ISO 9001, ISO 14001, ISO 45001, and CE certifications simultaneously - operating two factories spanning 200,000 m², plus a dedicated 20,000 m² raw stone yard to ensure material consistency.

Our metrology lab features:

• German Mahr dial indicators (0.5 µm resolution)
• Mitutoyo digital calipers & roughness testers
• Swiss Wyler electronic levels
• Renishaw laser interferometers

And every technician is trained annually in international standards (DIN, ASME, JIS, GB, BS, TOCT, EIE) - because knowing the rules is how you exceed them.

Why Our Granite Surface Plate Stands Apart

While many suppliers use commercial-grade stone or recycled aggregates, we source only high-density natural black granite (≈3100 kg/m³) - selected for its ultra-low thermal expansion, minimal internal stress, and exceptional homogeneity. This material forms the backbone of every surface plate we produce.

Our plates are hand-finished by master lappers with 30+ years of experience, capable of "feeling" micron-level deviations during polishing. The result? A working surface with flatness accuracy down to nanometer levels - certified and traceable to national standards.

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