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Gauge Blocks
Features and Accuracies
Features of Mitutoyo Gauge Blocks Grade and Application
Mitutoyo offers rectangular steel and ceramic (CERA Blocks) gauge blocks for use as length standards Grade 2:
in variously sized sets and as individual blocks. Accessories include wear blocks in tungsten carbide and These gauge blocks are intended for shop floor use to set and
ceramic in the standard thicknesses. Mitutoyo gauge blocks are recognized to be of the highest quality calibrate fixtures as well as precision instruments.
and are available in various grades to meet every need in respect of working conditions, environment and
application. Grade 1:
This grade is used within an inspection area to verify the
accuracy of plug and snap gauges as well as for setting
electronic measuring devices.
Accuracy Grade 0:
These higher accuracy gauges are intended for use within a
As a world-leading precision measuring equipment manufacturer, Mitutoyo is certified by the Japanese controlled environment by skilled inspection staff. Mainly used
government as an accredited calibration laboratory, which means that the accuracy of its gauge blocks as reference standards for setting high precision measuring
is guaranteed through traceability to the Metrology Management Centre of the National Institute of equipment and for the calibration of lower grade gauge
Advanced Industrial Science and Technology (AIST). blocks.
The following table can be used to select the gauge block
Wringing grade according to usage (specified by DIN861, BS4311, and
JIS B 7506).
Lapping measuring surfaces is one of Mitutoyo’s specialties. Our advanced technique, developed over
more than half a century, enables us to achieve the optimum flatness and surface finish needed for Usage Applications Grade
gauge blocks and thus maximize the wringing force. Workshop 2
use • Mounting tools and cutters
E Abrasion Resistance and Dimensional Stability of Steel Blocks • Manufacturing gauges 1 or 2
High-carbon high-chrome steel is employed to satisfy a variety of the material characteristics required Inspection • Calibrating instruments
use • Inspecting mechanical parts, 1 or 2
for gauge blocks. Our advanced heat treatment technology for steel blocks, which involves repeated tools, etc.
• Checking the accuracy of gauges 0 or 1
• Calibrating instruments
temperature cycling, simultaneously achieves excellent abrasion resistance and minimizes any change in • Checking the accuracy of gauge
blocks for workshop
length over time.
Calibration • Checking the accuracy of gauge
CERA Blocks use blocks for inspection 0
CERA blocks are made of a ceramic material with a superior surface finish, created by Mitutoyo’s ultra-
• Checking the accuracy of
instruments
precision machining techniques, that provides a premium quality block with significant advantages:
1. Corrosion Resistant Constructing a Gauge Block Stack
Anti-corrosion treatment is not required when handled normally (i.e. with fingers), resulting in simple The following points should be noted when constructing a
maintenance and storage. gauge block stack:
1. Use as few gauge blocks as possible to obtain the required
2. No Burrs Caused by Accidental Mishandling length by selecting thick blocks wherever possible.
Since the CERA Block is very hard, it will not scratch easily and is highly resistant to burrs. If a burr is 2. Select the block for the least significant digit first, then
formed, it can easily be removed with a ceramic deburring stone (Ceraston). work back through the more significant digits until the
3. Abrasion Resistant required length is attained.
CERA Blocks have 10 times the abrasion resistance of steel gauge blocks. 3. There are multiple combinations for the integer part of a
length. To reduce wear as much as possible, do not always
Abrasion loss data Steel use the same gauge blocks.
Example: Required length = 45.6785 mm
• For a 1 mm-based gauge block set (112 pcs.)
0.4 1.0005
Abrasion loss (µm) Silicon nitride
1.008
Tungsten carbide 1.17
0.2 17.5
CERA Block + ) 25.0
45.6785 mm
0 2000 4000 6000 8000 • For a 2 mm-based gauge block set (112 pcs.)
2.0005
Sliding distance (m) 2.008
4. Dimensionally Stable 2.17
CERA Blocks are free from dimensional change over time. 14.5
+ ) 25.0
5. Clearly Marked Sizes 45.6785 mm
Black characters, indicating the nominal length, are Note: For details on the recommended method of wringing, refer to
inscribed by laser and are clearly visible against the page E-17.
white surface of the block.
6. Non-Magnetic Nature Prevents Steel Swarf
Contamination
7. High Wringing Force
Superior flatness and surface finish provides
maximum wringing force.
E-3 Mitutoyo operates a policy of continuous improvement that aims to provide the customer with the benefit of the latest technological advances.
Therefore the company reserves the right to change any or all aspects of any product specification without notice.
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