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The Vermont Gage steel no-go (-) plug gage is a class X inch gage for calibrating measuring equipment and gage parts. A certificate of accuracy traceable to NIST is available for each gage. All gages measure 2” long, and are within .00002” round (per ASME B89.1.5), with at least a 4-microinch finish for a smooth finish. Tolerance for this class X gage is -.000040” for sizes up to .825” and -.000060” from .8251” to 1.000”. This gage is made of tool steel 60/64 Rc (cold stabilized) for durability. Plug gages are precision ground cylindrical steel plugs used to measure the diameter and depth of drilled or machined holes. They are available in different classes, based on acceptable tolerance (allowed deviation from the stated size). Standard tolerances and classes for cylindrical gages up to .825” are as follows: Class XX (.00002" or .0005 mm), Class X (.00004" or .0010 mm), Class Y (.00007" or .0018 mm), Class Z (.0001" or .0025mm), and Class ZZ (.0002" or .0050 mm). F
