UNPARALLELED LTD is one of the leading manufacturers and suppliers of precision granite master square in China. With abundant experience, we warmly welcome you to buy advanced precision granite master square made in China here from our factory. We also accept custom orders.
When precision matters down to the micron, your reference tools must be as stable as the machines you're calibrating. Our Precision Granite Square Ruler is engineered for engineers who refuse to compromise on geometric accuracy. Crafted from premium Jinan Black granite - renowned for its fine grain, high density, and thermal stability - this triangular square delivers unmatched rigidity and long-term flatness retention. The matte-black surface isn't just aesthetic; it minimizes glare under workshop lighting and resists fingerprints during frequent handling.
Unlike steel squares that warp under temperature swings or rust in humid environments, this granite square remains dimensionally inert. Whether you're verifying spindle perpendicularity on a 5-axis CNC mill or checking guide rail alignment on a surface grinder, its 90° angle holds true across seasons and shifts. The central hole? A thoughtful design touch - allows secure mounting or hanging without compromising structural integrity.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | Jinan Black Granite |
| Accuracy Grade | 0 / 00 (Customizable) |
| Standard Sizes | 300×200×40mm, 500×300×50mm, etc. |
| Weight Range | 8kg – 45kg (size-dependent) |
| Surface Finish | Hand-polished, non-reflective |
| Certification | GB/T 6092-85 / ISO 8512-2 |
| Customization | Yes – size, grade, hole position |
quality control
Why This Square Stands Out
- Zero Magnetic Interference: Safe for use near sensitive electronic probes and magnetic chucks.
- Thermal Stability: Coefficient of expansion is 1/3 that of steel - critical for labs with fluctuating ambient temps.
- Wear Resistance: Harder than most tool steels; maintains edge sharpness even after years of daily contact with cast iron workpieces.
- Multi-Surface Utility: All three faces are precision-ground - use any side as your reference plane.
- Export-Ready Packaging: Shock-absorbing foam + wooden crate ensures zero damage during ocean freight.
Real-World Applications
In automotive powertrain plants, our granite squares verify cylinder head deck perpendicularity before assembly. In aerospace component shops, they validate fixture plate orthogonality prior to milling titanium alloys. Lab technicians rely on them daily to recalibrate CMM probe heads - because when your measurement uncertainty budget is tight, every micrometer counts.
One client in Germany reported reducing rework scrap by 17% after switching from their old steel squares to our 00-grade granite version. "The consistency over six months was startling," said their QA manager. "No more seasonal recalibrations."
factory display
FAQ
Q: Can I get custom dimensions?
A: Absolutely. We routinely produce non-standard sizes for specialized machinery setups. Just send us your drawing - we'll confirm feasibility within 24 hours.
Q: How do I maintain calibration?
A: Store vertically or suspended via the center hole. Avoid dropping or striking edges. Recertify annually using an autocollimator or electronic level per ISO 8512-2.
Q: Is this suitable for outdoor use?
A: While granite itself won't corrode, prolonged UV exposure may fade markings. Best kept indoors or under sheltered conditions.
certificates
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