ZHHIMG® Precision Granite Square Ruler with Protective Carrying Case

High-Density ZHHIMG® Black Granite

The square ruler is manufactured from ZHHIMG® Black Granite, with a density of approximately 3100 kg/m³.

The material provides a combination of rigidity, dimensional stability, wear resistance, corrosion resistance and vibration-damping characteristics that makes granite suitable for precision metrology.

Unlike ordinary stone products or low-cost marble substitutes, ZHHIMG® selects and processes granite specifically for precision engineering applications.

Precision 90° Reference

The primary purpose of a granite square ruler is to establish a highly stable angular reference.

Depending on its configuration and specified accuracy grade, it can be used to inspect:

• •  Squareness
• •  Perpendicularity
• •  Machine-axis alignment
• •  Workpiece geometry
• •  Fixture alignment
• •  Guideway alignment
• •  Assembly accuracy
• •  CMM-related geometric references

Precision granite squares are commonly used for checking the relationship between nominally perpendicular machine axes and reference surfaces.

Precision-Machined and Hand-Lapped Surfaces

The working surfaces are produced through controlled machining, precision grinding and, where required, hand lapping.

ZHHIMG® combines modern large-format grinding equipment with experienced precision lapping technicians. Experienced technicians in the company have more than 30 years of hands-on lapping experience.

For precision measurement, the final surface condition is not simply a cosmetic requirement. Flatness, straightness, squareness and surface quality directly affect the reliability of the measurement reference.

Four Circular Lightening / Handling Holes

The product shown features four circular openings distributed across the granite body.

These openings reduce unnecessary mass while providing practical handling advantages without compromising the intended reference structure when properly engineered.

The exact hole configuration, dimensions and structural geometry can be customized according to the product size and customer's requirements.

Protective Aluminum Carrying Case

Precision measuring tools should not be treated like ordinary machine accessories.

The granite square is supplied with a dedicated protective carrying case designed to make transportation and storage safer. The case shown includes:

• •  Rigid aluminum-style exterior
• •  Protective internal cushioning
• •  Metal latches
• •  Carrying handle
• •  Dedicated internal support for the granite square

For customers moving precision inspection equipment between production areas, laboratories or machine installations, protective packaging helps reduce the risk of accidental impact during handling.