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Mitutoyo Gauge Blocks and 8. Characteristics of CERA Blocks Compared with other Gauge Block Materials
Inspection Certificates
Property CERA Block Material Silicon nitride
A Certificate of Inspection is furnished with all Mitutoyo (ZrO2) Steel Tungsten Carbide (Si3N4)
gauge blocks with a serial number on the box (in the case (Fe) (WC-Co)
of sets) and an identification number on each block. The
deviation of each block from nominal length, at the time of Hardness (HV) 1350 800 1650 1500
inspection, is stated. For this inspection, each gauge block
is measured relative to the upper level master using a gauge Coefficient of thermal expansion (10-6/K) 9.3±0.5 10.8±0.5 5.5±1.0 2
block comparator.
Flexural strength by 3-point bending (MPa) 1270 1960 1960 580
Fracture toughness K1c (MPa•m1/2) 7 120 12 6.5
Young’s modulus x10-4 (MPa) 20.6 20.6 61.8 28.4
Poisson’s ratio 0.3 0.3 0.2 0.3
Specific gravity 6.0 7.8 14.8 3.2
Thermal conductivity (W/m•k) 2.9 54.4 79.5 16.7
Note: Ceramics have the advantage of a slow response to temperature changes due to the low thermal conductivity. However, caution is required when using CERA blocks in
an environment subject to rapid temperature change.
9. Closest Expansion Coefficient to Steel
The thermal expansion coefficient of a CERA Block is quite similar to that of a steel gauge block.
Difference
in dimension
(µm) 3 Silicon nitride
2 Tungsten carbide E
1 CERA Block
17 18 19
20 21 22 23 Temperature (C)
–1
–2
Differences in size between alternative
gauge block materials and steel that are
–3 obtained when measuring over a length
of 100mm at each temperature.
10. Highly Resistant to Impact Damage
The CERA Block material is one of the toughest ceramics. It is extremely difficult to crack a CERA block in
normal use.
ACCURACY SPECIFICATIONS: BS 4311: Part 1: 1993 (UK)
Inch
Nominal length (inch)
Grade* over 0 over 0.4 over 1 over 2 over 3
up to 0.4 up to 1 up to 2 up to 3 up to 4
Tolerance on deviation of measured central length
±5 µin ±6 µin ±8 µin ±10 µin ±12 µin
0 Parallelism
4 µin 5 µin
Flatness
Tolerance on deviation of measured central length 4 µin
1 Parallelism ±10 µin ±12 µin ±15 µin ±20 µin ±25 µin
Flatness 6 µin 7 µin 8 µin
Tolerance on deviation of measured central length
6 µin
2 Parallelism
±20 µin ±25 µin ±30 µin ±40 µin ±50 µin
Flatness
12 µin 14 µin
10 µin
Metric
Nominal length (mm)
Grade* over 0 over 10 over 25 over 50 over 75
up to 10 up to 25 up to 50 up to 75 up to 100
Tolerance on deviation of measured central length
±0.12 µm ±0.15 µm ±0.2 µm ±0.25 µm ±0.3 µm
0 Parallelism
0.1 µm 0.12 µm
Flatness
Tolerance on deviation of measured central length 0.1 µm
1 Parallelism ±0.25 µm ±0.3 µm ±0.4 µm ±0.5 µm ±0.6 µm
Flatness 0.16 µm 0.18 µm 0.2 µm
Tolerance on deviation of measured central length
0.15 µm
2 Parallelism
±0.5 µm ±0.6 µm ±0.8 µm ±1.0 µm ±1.2 µm
Flatness
0.3 µm 0.35 µm
* At 20C
0.25 µm
Mitutoyo operates a policy of continuous improvement that aims to provide the customer with the benefit of the latest technological advances. E-4
Therefore the company reserves the right to change any or all aspects of any product specification without notice.
mitutoyo@mitutoyo-tools.ru www.mitutoyo-tools.ru