Alumina gauge blocks are precision ceramic length standards made from high-purity aluminum oxide, used to set and verify dimensional measuring instruments. Their non-magnetic and corrosion-free ceramic structure provides stable length, high wear resistance, and reliable performance in both laboratory calibration and shop-floor inspection environments.
Advantages of Alumina Gauges Blocks & Sets
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Non-magnetic and corrosion-free
Alumina gauge blocks are immune to rust in humid or oily environments and remain non-magnetic, reducing measurement interference with magnetic or electronic instruments. -
High wear resistance and dimensional stability
The high hardness and dense microstructure of alumina support strong abrasion resistance, enabling more calibration cycles before re-lapping or replacement is required. -
Low thermal expansion for stable readings
With a thermal expansion coefficient around 8 × 10⁻⁶/K, alumina gauge blocks help minimize length change around the reference temperature, which is important for high-precision grade 0 and grade 1 measurements. -
Clear laser markings and good readability
The contrast between the ceramic surface and laser-etched legends supports quick identification of nominal length, grade, and serial number, which simplifies daily use in metrology labs. -
Configurable sets and long blocks
Users can combine standard sets with long alumina gauge blocks up to 1000 mm to cover both small instrument setting tasks and machine tool alignment work under a unified material system.
Alumina Gauges Blocks Properties
| Property | Unit | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Open porosity | % | 0 | – | – | – | – | – |
| Color | – | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | 152 | – | – | – | – | – |
| Bulk modulus | GPa | 228 | – | – | – | – | – |
| Poisson’s ratio | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 2600 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 379 | 312 | 313 | 314 | 315 | 320 |
| Fracture toughness | MPa·m¹ᐟ² | 4 | – | – | – | – | – |
| Hardness | GPa | 14.1 (≈1440 kg/mm²) | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 35 | 32–37 | 33–38 | 34–39 | 35–40 | 36–42 |
| Thermal shock resistance ΔT | °C | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 8.4 | – | – | – | – | – |
| Specific heat | J/kg·K | 880 | – | – | – | – | – |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | 0.0002 | – | – | – | – | – |
Specifications of Alumina Gauge Blocks Sets
Type 1-Alumina Gauges Blocks

| Item | Gauge Size(mm) | Grades of Gauge Blocks(H) | Options for Grades(h) | Weight (g) |
| AT-CMT-015 | 0.5mm | 1 | 1/0/K | 10 |
| AT-CMT-016 | 0.5mm | 0 | 1/0/K | 11 |
| AT-CMT-017 | 25mm | 1 | 1/0/K | 26 |
| AT-CMT-018 | 25mm | 0 | 1/0/K | 27 |
| AT-CMT-019 | 30mm | 1 | 1/0/K | 28 |
| AT-CMT-020 | 30mm | 0 | 1/0/K | 29 |
| AT-CMT-021 | 40mm | 1 | 1/0/K | 30 |
| AT-CMT-022 | 40mm | 0 | 1/0/K | 31 |
| AT-CMT-023 | 41.2mm | 1 | 1/0/K | 32 |
| AT-CMT-024 | 41.2mm | 0 | 1/0/K | 33 |
| AT-CMT-025 | 41.3mm | 1 | 1/0/K | 34 |
| AT-CMT-026 | 41.3mm | 0 | 1/0/K | 35 |
| AT-CMT-027 | 50mm | 1 | 1/0/K | 36 |
| AT-CMT-028 | 50mm | 0 | 1/0/K | 37 |
| AT-CMT-029 | 60mm | 1 | 1/0/K | 38 |
| AT-CMT-030 | 60mm | 0 | 1/0/K | 39 |
| AT-CMT-031 | 70mm | 1 | 1/0/K | 40 |
| AT-CMT-032 | 70mm | 0 | 1/0/K | 41 |
| AT-CMT-033 | 75mm | 1 | 1/0/K | 42 |
| AT-CMT-034 | 75mm | 0 | 1/0/K | 43 |
| AT-CMT-035 | 80mm | 1 | 1/0/K | 44 |
| AT-CMT-036 | 80mm | 0 | 1/0/K | 45 |
| AT-CMT-037 | 81.5mm | 1 | 1/0/K | 46 |
| AT-CMT-038 | 81.5mm | 0 | 1/0/K | 47 |
| AT-CMT-039 | 90mm | 1 | 1/0/K | 48 |
| AT-CMT-040 | 90mm | 0 | 1/0/K | 49 |
| AT-CMT-041 | 100mm | 1 | 1/0/K | 50 |
| AT-CMT-042 | 100mm | 0 | 1/0/K | 51 |
| AT-CMT-043 | 125mm | 1 | 1/0/K | 52 |
| AT-CMT-044 | 125mm | 0 | 1/0/K | 53 |
| AT-CMT-045 | 150mm | 1 | 1/0/K | 54 |
| AT-CMT-046 | 150mm | 0 | 1/0/K | 55 |
Type 2-Alumina Gauges Block Sets

| Item | Gauge Size(mm) | Increments(mm) | Total Blocks | Grades of Gauge Blocks(h) | Weight (g) |
| AT-CMT-001 | 1-1.5mm | 0.01 | 51 | 1 | 12 |
| AT-CMT-002 | 1-1.5mm | 0.01 | 51 | 0 | 13 |
| AT-CMT-003 | 1.6-1.9mm | 0.1 | 4 | 1 | 14 |
| AT-CMT-004 | 1.6-1.9mm | 0.01 | 31 | 0 | 15 |
| AT-CMT-005 | 2-6.5mm | 0.5 | 10 | 1 | 16 |
| AT-CMT-006 | 2-6.5mm | 0.5 | 10 | 0 | 17 |
| AT-CMT-007 | 7-9.5mm | 0.5 | 6 | 1 | 18 |
| AT-CMT-008 | 7-9.5mm | 0.5 | 6 | 0 | 19 |
| AT-CMT-009 | 10-13.5mm | 0.5 | 8 | 1 | 20 |
| AT-CMT-010 | 10-13.5mm | 0.5 | 8 | 0 | 21 |
| AT-CMT-011 | 14-19.5mm | 0.5 | 12 | 1 | 22 |
| AT-CMT-012 | 14-19.5mm | 0.5 | 12 | 0 | 23 |
| AT-CMT-013 | 20-24.5mm | 0.5 | 10 | 1 | 24 |
| AT-CMT-014 | 20-24.5mm | 0.5 | 10 | 0 | 25 |
2.1 Metric set of Gauge Blocks
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Common gauge block sets: Grade K, Grade 0, Grade 1
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Caliper and micrometer setting sets: Grade 0, Grade 1
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Applicable standards: GB/T 6093, DIN EN ISO 3650, JIS B 7506
| Set Size | Standard | Block Composition (English) |
|---|---|---|
| 32-piece set | DIN EN ISO 3650 | 1.005 mm × 1; 1.01–1.09 mm (0.01 step, 9); 1.1–1.9 mm (0.1 step, 9); 1–9 mm (1 step, 9); 10–30 mm (10 step, 3); 50 mm × 1 |
| 32-piece set | JIS B 7506 | 1.005 mm × 1; 1.01–1.09 mm (0.01 step, 9); 1.1–1.9 mm (0.1 step, 9); 1–9 mm (1 step, 9); 10–30 mm (10 step, 3); 60 mm × 1 |
| 38-piece set | GB/T 6093 | 1.005 mm × 1; 1.01–1.09 mm (0.01 step, 9); 1.1–1.9 mm (0.1 step, 9); 1–9 mm (1 step, 9); 10–100 mm (10 step, 10) |
| 46-piece set | DIN EN ISO 3650 | 1.001–1.009 mm (0.001 step, 9); 1.01–1.09 mm (0.01 step, 9); 1.1–1.9 mm (0.1 step, 9); 1–9 mm (1 step, 9); 10–100 mm (10 step, 10) |
| 47-piece set | DIN EN ISO 3650 | 1.005 mm × 1; 1.01–1.19 mm (0.01 step, 19); 1.2–1.9 mm (0.1 step, 8); 1–9 mm (1 step, 9); 10–100 mm (10 step, 10) |
| 47-piece set | JIS B 7506 | 1.005 mm × 1; 1.01–1.09 mm (0.01 step, 9); 1.1–1.9 mm (0.1 step, 9); 1–24 mm (1 step, 24); 25–100 mm (25 step, 4) |
| 56-piece set | JIS B 7506 | 0.5 mm × 1; 1.001–1.009 mm (0.001 step, 9); 1.01–1.09 mm (0.01 step, 9); 1.1–1.9 mm (0.1 step, 9); 1–24 mm (1 step, 24); 25–100 mm (25 step, 4) |
| 76-piece set | JIS B 7506 | 1.005 mm × 1; 1.01–1.49 mm (0.01 step, 49); 0.5–10 mm (0.5 step, 20); 20–50 mm (10 step, 4); 75 mm × 1; 100 mm × 1 |
| 83-piece set | GB/T 6093 | 1.005 mm × 1; 1.01–1.49 mm (0.01 step, 49); 1.6–1.9 mm (0.1 step, 4); 0.5–9.5 mm (0.5 step, 19); 10–100 mm (10 step, 10) |
| 87-piece set | DIN EN ISO 3650 | 1.001–1.009 mm (0.001 step, 9); 1.01–1.49 mm (0.01 step, 49); 0.5–9.5 mm (0.5 step, 19); 10–100 mm (10 step, 10) |
| 88-piece set | JIS B 7506 | 1.0005 mm × 1; 1.001–1.009 mm (0.001 step, 9); 1.01–1.49 mm (0.01 step, 49); 0.5–9.5 mm (0.5 step, 19); 10–100 mm (10 step, 10) |
| 91-piece set | GB/T 6093 | 1.001–1.009 mm (0.001 step, 9); 1.01–1.49 mm (0.01 step, 49); 1.6–1.9 mm (0.1 step, 4); 0.5–9.5 mm (0.5 step, 19); 10–100 mm (10 step, 10) |
| 103-piece set | DIN EN ISO 3650 | 1.005 mm × 1; 1.01–1.49 mm (0.01 step, 49); 0.5–24.5 mm (0.5 step, 49); 25–100 mm (25 step, 4) |
| 112-piece set | DIN EN ISO 3650 | 1.0005 mm × 1; 1.001–1.009 mm (0.001 step, 9); 1.01–1.49 mm (0.01 step, 49); 0.5–24.5 mm (0.5 step, 49); 25–100 mm (25 step, 4) |
| 121-piece set | DIN EN ISO 3650 | 1.001–1.009 mm (0.001 step, 9); 1.01–1.49 mm (0.01 step, 49); 1.6–1.9 mm (0.1 step, 4); 0.5–24.5 mm (0.5 step, 49); 30–100 mm (10 step, 8); 25 mm × 1; 75 mm × 1 |
| 122-piece set | DIN EN ISO 3650 | 1.0005 mm × 1; 1.001–1.009 mm (0.001 step, 9); 1.01–1.49 mm (0.01 step, 49); 1.6–1.9 mm (0.1 step, 4); 0.5–24.5 mm (0.5 step, 49); 30–100 mm (10 step, 8); 25 mm × 1; 75 mm × 1 |
2.2 Inch set of Gauge Blocks
- Accuracy (Grades): Grade 0, Grade 1, Grade 2
- Applicable Standard: ASME B89
| Set Size | Standard | Block Composition (English) |
|---|---|---|
| 36-piece set | ASME B89 | 0.05 in × 1; 0.1 in × 1; 0.1001–0.1009 in (0.0001 step, 9); 0.101–0.109 in (0.001 step, 9); 0.11–0.19 in (0.01 step, 9); 0.2–0.5 in (0.1 step, 4); 1–2 in (1 step, 2); 4 in × 1 |
| 81-piece set | ASME B89 | 0.1001–0.1009 in (0.0001 step, 9); 0.101–0.149 in (0.001 step, 49); 0.05–0.95 in (0.05 step, 19); 1–4 in (1 step, 4) |
2.3 Detailed Size of Gauge Blocks
| Gauge Size(mm) | 1-1.5mm | 1.6-1.9mm | 1.6-1.9mm | 2-6.5mm | 7-9.5mm | 10-13.5 mm | 14-19.5 mm | 20-24.5 mm |
| Increments(mm) | 0.01 | 0.1 | 0.01 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| 1 | 1 | 1.6 | 1.6 | 2 | 7 | 10 | 14 | 20 |
| 2 | 1.01 | 1.7 | 1.61 | 2.5 | 7.5 | 10.5 | 14.5 | 20.5 |
| 3 | 1.02 | 1.8 | 1.62 | 3 | 8 | 11 | 15 | 21 |
| 4 | 1.03 | 1.9 | 1.63 | 3.5 | 8.5 | 11.5 | 15.5 | 21.5 |
| 5 | 1.04 | 1.64 | 4 | 9 | 12 | 16 | 22 | |
| 6 | 1.05 | 1.65 | 4.5 | 9.5 | 12.5 | 16.5 | 22.5 | |
| 7 | 1.06 | 1.66 | 5 | 13 | 17 | 23 | ||
| 8 | 1.07 | 1.67 | 5.5 | 13.5 | 17.5 | 23.5 | ||
| 9 | 1.08 | 1.68 | 6 | 18 | 24 | |||
| 10 | 1.09 | 1.69 | 6.5 | 18.5 | 24.5 | |||
| 11 | 1.1 | 1.7 | 19 | |||||
| 12 | 1.11 | 1.71 | 19.5 | |||||
| 13 | 1.12 | 1.72 | ||||||
| 14 | 1.13 | 1.73 | ||||||
| 15 | 1.14 | 1.74 | ||||||
| 16 | 1.15 | 1.75 | ||||||
| 17 | 1.16 | 1.76 | ||||||
| 18 | 1.17 | 1.77 | ||||||
| 19 | 1.18 | 1.78 | ||||||
| 20 | 1.19 | 1.79 | ||||||
| 21 | 1.2 | 1.8 | ||||||
| 22 | 1.21 | 1.81 | ||||||
| 23 | 1.22 | 1.82 | ||||||
| 24 | 1.23 | 1.83 | ||||||
| 25 | 1.24 | 1.84 | ||||||
| 26 | 1.25 | 1.85 | ||||||
| 27 | 1.26 | 1.86 | ||||||
| 28 | 1.27 | 1.87 | ||||||
| 29 | 1.28 | 1.88 | ||||||
| 30 | 1.29 | 1.89 | ||||||
| 31 | 1.3 | 1.9 | ||||||
| 32 | 1.31 | |||||||
| 33 | 1.32 | |||||||
| 34 | 1.33 | |||||||
| 35 | 1.34 | |||||||
| 36 | 1.35 | |||||||
| 37 | 1.36 | |||||||
| 38 | 1.37 | |||||||
| 39 | 1.38 | |||||||
| 40 | 1.39 | |||||||
| 41 | 1.4 | |||||||
| 42 | 1.41 | |||||||
| 43 | 1.42 | |||||||
| 44 | 1.43 | |||||||
| 45 | 1.44 | |||||||
| 46 | 1.45 | |||||||
| 47 | 1.46 | |||||||
| 48 | 1.47 | |||||||
| 49 | 1.48 | |||||||
| 50 | 1.49 | |||||||
| 51 | 1.5 |
Alumina Gauges Blocks Packaging
- Each alumina gauge block set is supplied in a rigid case with fitted foam compartments to avoid impact and edge chipping during transport.






