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Gage Blocks
Gage blocks (also called gauge blocks, Jo blocks, Hoke blocks, and Johansson gauges) are precision ground and lapped metal or ceramic blocks, used for calibrating precision measuring equipment and as a length standard in manufacturing. Gage blocks are square or… Learn More
Gage blocks should be kept within a protective case, cleaned thoroughly before wringing and after each use to prevent corrosion, and kept free of burrs and other damage that would decrease their accuracy. Temperature is another important consideration. Blocks are susceptible to thermal expansion and must be used at room temperature (68 degrees F) to ensure their accuracy.
Gage blocks are available in different grades, which refer to their tolerance or allowable deviation from their nominal dimension. Grades are defined by the American Society of Mechanical Engineers (ASME) B89.1.9M for both length and flatness. ASME B89.1.9M also defines standards for parallelism and surface finish. Different grades are available depending on the application and the required level of accuracy. Grade 00 blocks are generally used to calibrate and check the accuracy of instruments, grade 0 blocks for setting and checking gages in quality control, grade AS-1 blocks for tool rooms and production purposes, and grade AS-2 are similar to AS-1 blocks but are slightly less accurate. Grade K blocks are used for calibrating and checking the accuracy of other gage blocks within a temperature-controlled inspection or calibration room. A certificate of inspection and calibration is provided with each gage block or set, specifying the deviation of the individual block from its nominal length.
3,800 products grouped into 133 families
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Mitutoyo Ceramic Square Gage Block, ASME Grade AS-1, Inch
(multiple sizes available)
$33.73 – $258.29
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Mitutoyo Ceramic Rectangular Gage Block, ASME Grade AS-1, Metric
(multiple sizes available)
$23.63 – $2,339.83
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Mitutoyo Ceramic Square Gage Block, ASME Grade 00, Inch
(multiple sizes available)
$75.17 – $539.24
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Mitutoyo Ceramic Rectangular Gage Block, ASME Grade AS-2, Metric
(multiple sizes available)
$37.82 – $89.07
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Mitutoyo Steel Rectangular Gage Block, ASME Grade K, Metric
(multiple sizes available)
$51.44 – $440.73
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Mitutoyo Steel Rectangular Gage Block, ASME Grade 00, Inch
(multiple sizes available)
$37.24 – $1,253.19
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Mitutoyo Steel Square Gage Block, ASME Grade AS-1, Inch
(multiple sizes available)
$14.76 – $698.76
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Mitutoyo Steel Square Gage Block, ASME Grade AS-2, Inch
(multiple sizes available)
$20.63 – $684.69
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Mitutoyo 516-101-26, Steel Micrometer Inspection Gage Block Set, Metric, ASME Grade AS-1, 10 Blocks
$254.02
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Mitutoyo Steel Rectangular Gage Block, ASME Grade AS-1, Inch
(multiple sizes available)
$15.00 – $591.50
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Mitutoyo Steel Square Gage Block, ASME Grade 00, Inch
(multiple sizes available)
$17.81 – $1,654.39
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Mitutoyo Steel Rectangular Micrometer Inspection Gage Block Set, ASME Grade AS-1, 0.0625 - 2.0" Length (9 Blocks)
$159.22
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Mitutoyo Ceramic Square Gage Block, ASME Grade AS-2, Inch
(multiple sizes available)
$35.51 – $96.53
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Mitutoyo Ceramic Rectangular Gage Block, ASME Grade 0, Inch
(multiple sizes available)
$20.69 – $3,095.66
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Mitutoyo Steel Square Gage Block, ASME Grade 00, Metric
(multiple sizes available)
$66.04 – $1,872.30
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Mitutoyo Steel Square Gage Block, ASME Grade AS-1, Metric
(multiple sizes available)
$7.99 – $1,124.96
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Mitutoyo Steel Square Gage Block, ASME Grade AS-2, Metric
(multiple sizes available)
$47.58 – $425.07
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Mitutoyo Ceramic Rectangular Wear Gage Block Set, ASME Grade AS-1, Inch
(multiple sizes available)
$87.46 – $89.07
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Mitutoyo Steel Rectangular Gage Block Set, ASME Grade AS-2, Inch
(multiple sizes available)
$595.25 – $1,176.86
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Mitutoyo Ceramic Square Wear Gage Block Set, ASME Grade AS-1, Inch
(multiple sizes available)
$94.96