Starrett Five-Face Granite Master Square 12L x 12H x 3T – Grade AA Laboratory – 81919

Five-Face Granite Master Squares are popular for accurately checking the X-Y-Z axes on CNC machine tools and coordinate measuring machines.

Laying in the horizontal position, the X and Y axes can be checked for 90o squareness. With the square in the vertical position, tracing along the vertical edge of the square can check the perpendicularity of the Z axis. By tracing along the top edge of the square while in the vertical position, it will check parallelism of the table in the X and Y axes.

Five-face master squares may also be used on any work that requires the checking of squareness or parallelism.

• Grade (U.S.): AA Laboratory Squares: .000025″/6″ TIR (0.0006/150mm)
• Made in the U.S.A.

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