In precision manufacturing and quality control, the material composition of a measuring tool bears directly on both measurement accuracy and service life. The CAA series of ceramic gages from NIIGATA SEIKI is positioned around that relationship, using an advanced zirconia ceramic to address the wear and thermal-drift problems that affect conventional steel gages in high-precision calibration and industrial inspection.
Compared with conventional steel gages, ceramic materials offer clear advantages in wear resistance, corrosion resistance and thermal stability. The CAA series is manufactured from AmZirOx 86 zirconia ceramic, a yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) whose microstructure is engineered to absorb impact energy through transformation toughening, a mechanism intended to reduce the brittleness that ordinarily limits ceramic tools in demanding environments.
Ceramic also carries a lower coefficient of thermal expansion than steel, which matters where shop-floor temperatures fluctuate. Under such conditions a gage holds its dimensions more consistently, supporting repeatable measurement data.
NIIGATA SEIKI supplies several ceramic gage types to cover different measurement tasks. The line spans accuracy grades from Class ZZ through Class XX and is intended for demanding applications, including calibration of Keyence vision systems.
| Product type | Accuracy grade |
|---|---|
| Ceramic plug gages | Class ZZ, Z, X, XX, Y |
| Ceramic ring gages | Class ZZ, Z, X, XX, Y |
| Ceramic gage blocks | Grade 00 |
| Ceramic thread gages | Class ZZ, Z, X, XX, Y |
The physical properties of a material determine how it performs in industrial use. The table below compares the thermal expansion coefficients of AmZirOx 86 zirconia and Amalox 68 alumina, with 1018 carbon steel included as a reference point.
| Material | Thermal expansion coefficient (CTE) |
|---|---|
| Amalox 68 alumina | 8.2 |
| AmZirOx 86 zirconia | 10.3 |
| 1018 carbon steel (reference) | 12.0 |
The figures place zirconia below carbon steel but above alumina, a distinction that guides material selection where dimensional stability under heat is the governing requirement.
Transformation toughening works at the microstructural level, where a stress-induced phase change absorbs impact energy. In practice, the company says, this means a gage is less likely to chip or fracture after a minor knock or drop, which extends the interval between maintenance and replacement.
Hardness and abrasion resistance also allow the gages to retain geometric accuracy over extended use, a property relevant to shops that treat gages as long-lived references rather than consumables.
