High-Precision Granite Straight Ruler

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

The Ultimate Reference for Linear Accuracy and Machine Alignment

In ultra-precision manufacturing, the Granite Straight Ruler is an indispensable tool for verifying the straightness and parallelism of machine guide rails and high-speed stages. UNPARALLELED® produces these rulers using our proprietary high-density black granite, which offers a physical stability that far exceeds standard commercial marble.

Our straight rulers are engineered for industries where a single micron is the difference between success and failure-specifically for Semiconductor, CMM, and Optical Inspection (AOI) applications.

• UNPARALLELED® Black Granite: We use exclusive material with a density of ≈ 3100kg/m³, providing superior vibration damping and thermal stability compared to European or American black granite.
• Precision Hand-Lapping: Every ruler is finished by master technicians with over 30 years of experience, achieving accuracies that we describe as "walking electronic levels".
• Weight-Optimized Design: As seen in our product image, we incorporate precision-engineered reduction holes to ensure the tool is manageable without sacrificing structural rigidity or bending resistance.
• Unmatched Durability: Our black granite is acid-resistant, non-magnetic, and does not rust, ensuring the measuring surface remains pristine over decades of use.

• Machine Tool Calibration: Aligning linear motion guides and ball screws with sub-micron precision.
• Semiconductor Equipment: Serving as the master reference for XY Table assembly and lithography stages.
• Metrology Labs: Used as a reference standard for checking the accuracy of other measuring instruments.
• Large-Scale Engineering: Ideal for the aerospace and automotive industries where long-span flatness is critical.

To ensure your UNPARALLELED® Straight Ruler maintains its certified accuracy for a lifetime, follow these professional protocols:

• Cleaning: Always clean the working surface with a lint-free cloth and specialized granite cleaner before and after use to remove microscopic dust.
• Temperature Stabilization: Allow the ruler to acclimate to your cleanroom environment (ideally 20°C) for several hours before performing critical measurements.
• Storage: Store the ruler in a horizontal position on its designated support points to prevent gravitational deflection or "sagging" over time.
• Traceability: Periodically verify the accuracy using a Renishaw Laser Interferometer or Wyler Electronic Level to maintain NIST or national-level traceability.

Why Choose UNPARALLELED®?

We are the only manufacturer in the industry to hold ISO 9001, ISO 45001, ISO 14001, and CE certifications simultaneously. Our products are trusted by global leaders such as Apple, Samsung, Bosch, and the UK National Physical Laboratory. When you choose UNPARALLELED®, you are choosing the industry's gold standard.

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