Granite Squares

Precision Granite Squares

Granite Master Squares and Granite Tri-Squares are extremely popular for accurately measuring the perpendicularity, squareness and straightness of the X, Y, and Z axes of machine tools.

These precision ground granite squares are MADE IN THE USA and are made of black granite, which is stronger and denser than light colored granite. Because the block granite is more stable, it provides more accurate and more repeatable measurements.

 We offer the following Granite Squares...

Granite Tri-Squares

A Grade - Inspection Grade (.0001" Accuracy)

AA Grade - Laboratory Grade (.000050" Accuracy)

Granite Tri-Squares

Granite Master Squares

A Grade - Inspection Grade (.0001" Accuracy)

AA Grade - Laboratory Grade (.000050" Accuracy)

Granite Master Squares

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