New Dimensions in Accuracy

Our commitment to quality is exemplified by both our ISO 9001:2000 certified quality system and our A2LA (American Association for Laboratory Accreditation) Accreditation per the ISO/IEC 17025 standard for calibration. Tru-Stone provides NIST traceable documentation on all granite machine bases, surface plates and metrology accessories.

We are proud of the complete value added package we can offer you, which includes our customer service, technical expertise, attention to detail, responsiveness and accuracy. Learn first hand the level of support you can experience for all of your precision granite related needs.


When your application calls for a plate with custom shapes, threaded inserts, slots or other machining, you’ll want to select a material like Black Diabase. This natural material is similar to granite but offers superior stiffness, vibration dampening and improved machinability.


The granite utilized by Tru-Stone for our standard surface plate products has high quartz content, which provides greater resistance to wear and damage. Our “Superior Black” and “Crystal Pink” colors have low water absorption rates, thus minimizing the possibility of your precision gages rusting while setting on the plates. The colors of granite offered by Tru-Stone create less glare resulting in less eyestrain for individuals using the plates. We have chosen our granite types while considering thermal expansion in an effort to keep this aspect minimal. And flatness is an ongoing, improving process as we continue to get closer specifications and higher tolerances.

Why Choose Granite?

Granite is the material of choice for machine bases and metrology components for a variety of reasons including:
  • Machinability
  • Ultimate Flatness
  • Does Not Rust
  • Long Wearing Properties
  • Easy Cleaning
  • Many Sizes and Accessories Available
  • Can Be Mobile