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   Gage Block


ceramic gage block

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tungsten carbide gage block

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A set of metric gauge blocks. Sizes are listed under each block. eg:- a pair of 2mm thick wear blocks at the lower left corner.
Gauge blocks (also known as gauge blocks, Johansson gauges, slip gauges, Jo blocks, block gauges) are precision ground and lapped measuring standards. Rectangular, square, wear, scribing and angle gage blocks are available in hardened steel, carbide and ceramic materials.
They are used as references for the setting of measuring equipment such as micrometers, sine bars, dial indicators (when used in an inspection role).

They are available in various grades depending on their intended use.
  1. reference (AAA) - high tolerance (¡¾ 0.00005 mm or 0.000002 in) used to establish standards
  2. calibration (AA) - (tolerance +0.00010 mm to -0.00005 mm) used to calibrate inspection blocks and very high precision gauging
  3. inspection (A) - (tolerance +0.00015 mm to -0.00005 mm) used as toolroom standards for setting other gauging tools
  4. workshop (B) - low tolerance (tolerance +0.00025 mm to -0.00015 mm) used as shop standards for precision measurement


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