Cylindrical Ring Gages

Plain Cylindrical Ring Gages also referred to as Plain Cylindrical Ring Gauges are used to check the outside diameter limit on manufactured parts. Cylindrical ring gages are also used as masters for setting air gages, bore gages and internal micrometers. When they are used to check a part directly, the cylindrical ring gages are referred to as GO and NOGO. The GO checks the upper limit of the part tolerance while the NOGO checks the lower limit. Plain cylindrical ring gages are available in steel, chrome, and carbide in Class XXX, Class XX, Class X, Class Y, and Class Z in inch or metric.


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  • Free technical support from our knowledgeable engineering team with over 100+ years’ experience
  • Cylindrical ring gages are AGD – American Gage Design
  • GO or NOGO
  • Precision hand lapped and polished to ensure superior accuracy
  • Manufactured to the highest end of the ANSI specifications to provide maximum wearability
  • Final inspection of plain cylindrical ring gauges is completed in an environmentally controlled ISO 17025 laboratory
  • Free NIST certificate of accuracy