Square classification guide

Classifications:

Class H = 0.00008" + 0.00001" per inch
Class N = 0.00020" + 0.00002" per inch
Class 1 = 0.00040" + 0.00005" per inch
Class 2 = 0.00080" + 0.00010" per inch

So, for a six inch Class 2 square, the overall accuracy would be 0.0014". This means that no point along the edge of the square deviates from perfect squareness by more than 0.0014".

The squares we sell for use with TS-Aligner conform to accuracy Class 2. We use a Laboratory Grade AA granite square on a Starrett Laboratory Grade AA Crystal Pink Granite Surface Plate to calibrate TS-Aligner.

We also have a Class H bevel edge square and a precision master cylinder square for checking our machinery and other squares.


		Precision Square Classification Guide
		When purchasing a square, you should look for a specification telling you it's accuracy. Un-graded squares are rarely a good buy. The accuracy of a square is typically specified as the maximum deviation from perfect squareness over a given length.
TS-Aligner TS-Aligner Jr. TS-Aligner Jr. Lite RS-Aligner Accessories Technical Documentation How to buy Genuine Testimonies Home		Classifications: Class H = 0.00008" + 0.00001" per inch Class N = 0.00020" + 0.00002" per inch Class 1 = 0.00040" + 0.00005" per inch Class 2 = 0.00080" + 0.00010" per inch So, for a six inch Class 2 square, the overall accuracy would be 0.0014". This means that no point along the edge of the square deviates from perfect squareness by more than 0.0014". The squares we sell for use with TS-Aligner conform to accuracy Class 2. We use a Laboratory Grade AA granite square on a Starrett Laboratory Grade AA Crystal Pink Granite Surface Plate to calibrate TS-Aligner. We also have a Class H bevel edge square and a precision master cylinder square for checking our machinery and other squares. Last revised: January 21, 2006.
		Copyright 2005 Edward J. Bennett Company All rights reserved.

Last revised: January 21, 2006.