TSUBAKI NAKASHIMA
Tsubaki Nakashima Alumina Oxide (99.5% Al2O3)
Manufacturer: TSUBAKI NAKASHIMA CO., LTD.
Model: 99.5% Al2O3
Features
- Alumina oxide balls have proven capabilities with superior wear performance in corrosive environments and high temperature conditions.
- The material resists oxidation and is tolerant to high moisture environments, salt solutions, and many chemicals.
- Typical applications include pumps, valves and flow meters
| Materials | |||
|---|---|---|---|
| Items | Chrome Steel (SUJ2) | Silicon Nitride (Si3N4) | Alumina Oxide (99.5% Al2O3) |
| Density (g/cm3) | 7.8 | 3.24 | 3.9 |
| Hardness (Hv, 20kg) | 772 – 900 | 1,500 | 1,600 – 1,700 |
| Coefficient of thermal expansion (x10-6/℃) | 12.5 | 3.0 | 8.2 – 9.0 |
| Max. use temperature (℃) | 160 | 800 | 1,400 |
Dimensional Accuracy
Grade Diameter
mmAllowable ball
grade deviations
high/low
μmVariation of ball lot
diameter
Max. μmDeviation from
spherical form
Max. μmSurface roughness
Max. μmRaC10 3.0 – 25.4 +1.27/-1.02 0.508 0.508 0.0762 C15/C16 3.0 – 25.4 +1.27/-1.02 0.762 0.762 0.0762 C24/C25 3.0 – 25.4 +2.54/-2.54 1.27 0.635 0.0762 48/50 3.0 – 50.8 +5.08/-5.08 2.54 1.27 0.0762 100 3.0 – 101.6 +12.7/-12.7 5.08 2.54 0.102 200 3.0 – 152.4 +25.4/-25.4 10.16 5.08 0.203
