UNPARALLELED LTD is one of the leading manufacturers and suppliers of precision granite straightedge in China. With abundant experience, we warmly welcome you to buy advanced precision granite straightedge made in China here from our factory. We also accept custom orders.
Product Overview
In the demanding world of ultra-precision manufacturing, "close enough" is never acceptable. Whether you are calibrating a CNC machine tool, aligning a semiconductor lithography system, or verifying the linearity of a CMM guideway, your reference standard must be unimpeachable.
The UNPARALLELED® Precision Granite Straight Edge is not just a measuring tool; it is a guarantee of geometric truth. Crafted from our proprietary high-density black granite (approx. 3100kg/m³), this straight edge offers superior rigidity and thermal stability compared to standard granites or inferior marbles often found in the market. Designed for engineers who refuse to compromise, it serves as the definitive baseline for checking straightness, flatness, and parallelism in the most critical industrial applications.
Why Choose UNPARALLELED® Granite? (The Material Difference)
- Extreme Density (~3100kg/m³): Provides massive damping capacity, absorbing vibrations instantly to ensure stable readings.
- Zero Magnetic & Non-Conductive: Safe for use around sensitive electronic equipment and magnetic fields.
- Corrosion & Rust Proof: Unlike steel straight edges, our granite will never rust, even in humid environments, ensuring a lifetime of accuracy.
- Low Thermal Expansion: Maintains dimensional stability even with slight temperature fluctuations in the workshop.
quality control
Key Features & Technical Specifications
| Feature | Specification / Detail |
|---|---|
| Material | UNPARALLELED® Premium Black Granite (Jinan Black) |
| Density | ≥ 3100 kg/m³ (Superior to standard G654 granite) |
| Accuracy Grades | Grade 00, Grade 0, Grade 1 (Customizable) |
| Straightness Tolerance | Grade 00: 2 × (1 + L/1000) μm (Example: 3 μm for 1m) |
| Surface Finish | Fine lapped finish, Ra < 0.4 μm |
| Parallelism | High precision parallel working faces |
| Hardness | HS > 70 (Highly wear-resistant) |
| Standards Compliance | DIN 876, ASME B89.1.6, JIS B 7512, GB/T 24761 |
| Customization | Custom lengths, widths, and hole patterns available |
(Note: L = Length in mm. Tolerances are subject to final inspection report.)
Applications: Where Precision Matters Most
- Machine Tool Calibration: Checking the straightness of lathe beds and milling machine guideways.
- Semiconductor Manufacturing: Aligning wafer handling robots and lithography stages.
- CMM & Metrology Labs: Serving as a master artifact for verifying other measuring instruments.
- Optical & Laser Systems: Providing a stable, vibration-free reference line for laser alignment.
- PCB & Electronics Assembly: Ensuring the linear motion of SMT pick-and-place machines is within tolerance.
services
The UNPARALLELED® Promise: Integrity in Every Micron
- It's Real Granite: We strictly resist the industry practice of selling marble as granite. What you see is high-density, stable stone.
- It's Masterfully Lapped: Our craftsmen, some with over 30 years of experience-known as "walking electronic levels"-hand-finish these edges to ensure they meet the rigorous demands of Grade 00 accuracy.
- It's Verified: Every unit leaves our 10,000m² constant temperature and humidity workshop with a calibration certificate traceable to national standards, verified by Renishaw laser interferometers and Mahr indicators.
certificates
FAQ
A: Absolutely. We have massive processing capabilities (up to 20m length) and can manufacture custom dimensions to fit your specific machine bed or inspection table requirements.
A: Granite is naturally stable, but we recommend keeping it covered when not in use to prevent dust accumulation. Avoid dropping heavy objects on the working surface. Periodic recalibration is recommended based on usage frequency.
A: Yes. We provide comprehensive inspection reports. For higher-grade requirements, we can arrange calibration traceable to international metrology institutes.
A: Higher density means finer grain structure and better wear resistance. Our specific black granite source is geologically unique, offering superior performance for ultra-precision tasks compared to common grey granites.
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