UNPARALLELED LTD is one of the leading manufacturers and suppliers of stable granite surface plates in China. With abundant experience, we warmly welcome you to buy advanced stable granite surface plates made in China here from our factory. We also accept custom orders.
Product Overview
Stable Granite Surface Plates, crafted from natural granite and precision-machined to achieve high flatness (including 00 and 000 grades), offer key advantages:
Exceptional stability: Natural stone's low thermal expansion minimizes temperature-related distortion, ensuring long-term dimensional consistency.
Superior durability: High hardness and corrosion resistance extend lifespan far beyond metal alternatives, with excellent wear resistance.
Non-magnetic: Eliminates magnetic interference, ideal for laboratories and high-precision industrial settings.
Eco-friendly: Made from natural materials without coatings, compliant with international standards like RoHS.
Specifications
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Model |
Details |
Model |
Details |
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Size |
Custom |
Application |
CNC,Laser,CMM... |
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Condition |
New |
After-sales Service |
Online supports,Onsite supports |
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Origin |
Jinan City |
Material |
Black Granite |
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Color |
Black/Grade 1 |
Brand |
UNPARALLELED |
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Precision |
0.001mm |
Weight |
≈3.05g/cm3 |
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Standard |
DIN/GB/JIS... |
Warranty |
1year |
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Packing |
Export Plywood CASE |
After Warranty Service |
Video technical support,Online support,Spare parts,Field mal |
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Payment |
T/T,L/C |
Certificates |
Inspection Reports/Quality Certificate |
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Keyword |
Granite Machine Base; Granite Mechanical Components;Granite Machine Parts;Precision Granite |
Certification |
CE,GS,ISO,SGS,TUV.. |
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Delivery |
EXW;FOB;CIF;CFR;DDU;CPT... |
Drawings'format |
CAD;STEP;PDF... |
📩 Test reports, material analysis, and ISO certifications are available upon request.
Applications
CNC Guide Rail Straightness Calibration
Mold and Die Assembly Precision Alignment
Semiconductor Equipment Platform Leveling
Scientific Lab Flatness Inspection
Factory Showcase
Key Features & Real-World Applications
A. Core Advantages: Engineered for Uncompromising Precision
Superior Thermal Stability
Unlike metal alternatives, natural Jinan Green granite boasts a thermal expansion coefficient just one-third that of steel. Even with a 10°C temperature fluctuation in workshops, flatness variation remains under 1μm-eliminating temperature-induced measurement errors.
Industrial-Grade Durability
Non-magnetic, acid-resistant, and oil-repellent, these granite plates maintain pristine condition for up to 20 years, even in humid workshops or chemical laboratories. Say goodbye to extra corrosion-prevention costs associated with metal platforms.
Micron-Level Accuracy
Achieving flatness of Grade 0 (±2.5μm) to Grade 00 (±1.5μm) per square meter (GB/T 20428-2006), their precision errors are hundreds of times smaller than a human hair's diameter-providing an "optical lens-grade" foundation for coordinate measuring machines (CMMs) and precision tools.
Hassle-Free Maintenance
No need for regular rust-proofing or shutdowns for upkeep. Daily wiping is sufficient to keep the plates in peak condition, reducing maintenance costs by over 60% compared to metal alternatives.
B. Versatile Applications: Powering Precision Across Industries
High-End Manufacturing
Ensures stable support for inspecting automotive engine crankshaft bores, detecting errors as small as 0.001mm.
Eliminates vibration interference during 3D scanning of aerospace turbine blades, guaranteeing accurate scan data.
Research Laboratories
Protects sensitive components during semiconductor wafer inspection with its non-magnetic properties, preventing static-induced dust attraction.
Serves as the ideal base for laser interferometers during optical instrument calibration, thanks to its 0.2μm mirror-like surface finish.
Production Line Efficiency
Allows direct marking of positioning lines on the working surface; its wear resistance ensures markings remain clear for up to a decade.
Offers 48-hour turnaround for custom non-standard sizes, enabling rapid response to urgent batch testing requirements.
Quality Control
| Comparison Factor | Our Granite Surface Plates | Traditional Metal Plates | Low-Quality Granite Plates |
|---|---|---|---|
| Material & Certification | High-density "Jinan Green" granite, ISO 9001 certified; strict quality control from raw material to finished product. | Cast iron/steel; often lacks international quality certifications. | Low-grade granite with loose structure; no formal quality checks. |
| Thermal Stability | Thermal expansion coefficient 1/3 of steel; ≤1μm flatness variation even with 10°C temperature changes. | High thermal expansion; significant flatness drift in temperature-fluctuating environments. | Poor stability; prone to warping under temperature changes. |
| Accuracy & Longevity | Grade 0/00 flatness (±1.5μm-±2.5μm); Ra ≤0.2μm surface roughness; maintains precision for 20+ years. | Grade 1/2 accuracy (±5μm-±10μm); degrades over time due to wear/rust. | Inconsistent flatness (often ≥±10μm); surface roughness >1μm; precision fades quickly. |
| Durability & Maintenance | Non-magnetic, corrosion/oil-resistant; 20-year lifespan with daily wiping only; no rust-proofing needed. | Magnetic; prone to rust/corrosion; requires regular oiling/painting; 5-8 year typical lifespan. | Porous surface; stains easily; needs frequent repairs; 3-5 year lifespan. |
| Application Versatility | Ideal for CMMs, aerospace/automotive inspection, lab calibration, and high-precision manufacturing. | Limited to low-precision tasks; unsuitable for magnetic-sensitive or corrosive environments. | Fails in high-accuracy scenarios (e.g., semiconductor inspection, laser calibration). |
| Customization & Support | 48-hour turnaround for custom sizes; full technical guidance + real-time production videos. | Long lead times (2-4 weeks) for customization; minimal post-sales support. | No custom options; limited or no technical assistance. |
International Certification and Service System
Delivery, Shipping & Support
A. Streamlined Delivery
Comprehensive Documentation: Includes inspection reports, calibration certificates (for measuring devices), quality certificates, invoices, packing lists, contracts, and bills of lading/airway bills.
Secure Packaging: Export-compliant, fumigation-free plywood crates to ensure product safety during transit.
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Ship |
Qingdao port |
Shenzhen port |
TianJin port |
Shanghai port |
... |
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Train |
XiAn Station |
Zhengzhou Station |
Qingdao |
... |
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Air |
Qingdao Airport |
Beijing Airport |
Shanghai Airport |
Guangzhou |
... |
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Express |
DHL |
TNT |
Fedex |
UPS |
... |
B. Dedicated Support
Technical Assistance: Expert guidance for assembly, adjustment, and maintenance.
Transparent Process: Real-time access to manufacturing and inspection videos-from material selection to delivery-allowing customers to monitor every detail remotely, anytime.
FAQ
Q: How do you calibrate a granite surface plate?
Calibration and Verification
If necessary, adjustments to the surface plate flatness – typically onsite re-lapping – can be done by those with the required skills and tools. The overall flatness is often checked with a laser interferometer, autocollimator, electronic levels, or master straightedge and indicator.
Q: What is the most accurate surface plate?
Granite
Granite is considered to be the best material for a surface plate due to its surface hardness, low thermal expansion, no rust or corrosion, little warping, and long wear life attributes. These attributes result in very accurate, stable and precise measurements.
Q: What are the grades of granite surface plates?
There are four grades of surface plates. Laboratory grade AA and A, Room Inspection Grade B, and the fourth is Workshop Grade. Grade's AA and A are the flattest with a flatness tolerances better than 0.00001 in for a Grade AA plate.
Q: What is the difference between Grade A and B surface plates?
Grade A – Inspection Grade This is typically specified for general work in quality control. Grade B – Toolroom Grade This is typically specified for production checking work throughout the shop. Overall flatness tolerance is based on unilateral measurement.
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