Precautions for Using Grade 00 Granite Square for Verticality Inspection

Granite squares, also known as granite angle squares or triangle squares, are precision measuring tools used for inspecting the perpendicularity of workpieces and their relative vertical positions. They are also occasionally used for layout marking tasks. Thanks to their exceptional dimensional stability and accuracy, granite squares are ideal for use in precision assembly, maintenance, and quality inspection environments.

Overview of Granite Square Specifications

Granite angle squares are commonly available in compact and medium sizes. Among them, the Grade 00 granite square with dimensions 630×400 mm is one of the most frequently used. While most granite squares feature multiple circular weight-reduction holes to ease handling, larger models are still relatively heavy and should be handled with care to avoid damage or strain.

How to Properly Use a Granite Square

When inspecting the verticality of a workpiece, you should utilize the two 90-degree working edges of the granite square. These surfaces are precision-ground and serve as the functional reference surfaces.

Key usage tips:

• Handle with care: Always place the square gently with its non-working surface facing downward to prevent damage. Only release your grip after the tool is securely positioned.

• Use in a temperature-controlled environment: Like all granite measuring tools, granite squares must be used in climate-controlled rooms to maintain their precision.

• Cleanliness is essential: Ensure the working surfaces of the granite square, the workbench or reference plate, and the test object surface are all clean and free of debris. Dust or particles can interfere with the measurement.

• Only use smooth test objects: Surfaces to be measured should be machined flat or polished to ensure accurate readings.

Precautions for Small-Sized Granite Squares

For smaller granite square models—such as the 250×160 mm Grade 0 granite square—be especially cautious:

• Despite their lighter weight and one-hand operability, never use granite squares as hammers or striking tools.

• Avoid dropping or applying lateral force, as this could chip the edges or compromise measurement accuracy.

Maintenance Requirements

Grade 00 granite squares are extremely durable and require minimal maintenance. Although routine oiling or special treatments are unnecessary, proper use and handling will significantly extend their service life—often lasting decades without performance degradation.

Conclusion

Granite angle squares are essential tools in modern precision manufacturing and metrology. Their non-magnetic properties, rust resistance, thermal stability, and high geometric accuracy make them indispensable for applications where vertical alignment is critical.

When used correctly—especially in controlled environments with careful handling—even the most delicate Grade 00 granite squares will maintain their calibration and deliver reliable results for years.