Heat-Resistant Stainless Bearings
Heat-resistant bearings are made of AISI 440C stainless steel and are filled with heat-resistant fluorine grease.
Features
- Operating temperature is up to 250℃ /482℉, except sealed type.
- AISI 440C stainless steel has lower hardness decrease ratio and smaller dimension changes than SAE 52100 bearing steel in high temperature environment.
- AISI 440C stainless steel is superior to SAE 52100 bearing steel in oxidation resistance in high temperature environment.
- Filling heat-resistant fluorine grease enables lubrication in high temperature environment.
Product Specifications
| Standard Specifications | |
|---|---|
| Inner and Outer Rings | AISI 440C |
| Balls | AISI 440C |
| Retainer | AISI 304 |
| Shield | AISI 304 |
| Seal | Fluorine rubber* |
| Lubricant | Heat-resistant fluorine grease |
| Radial clearance*1 | C4 |
* Sealed type is usable up to 200℃ /392℉
The following special specifications are also available.
*1 Special clearance, such as C3 or C5.
Performance
Durability in high temperature environment
*The above performance values are our test results and are not guaranteed values.
Application
Device around furnace, oven, heater, drying equipment, vacuum apparatus and other high temperature area.
Heat-Resistant Hybrid Bearings
Heat-resistant Hybrid Bearings offer a longer lifetime, by incorporating ceramic balls, compared to Heatresistant Stainless Bearings.
Features
- Operating temperature is up to 250℃ /482°F, except sealed type.
- Hybrid type incorporating ceramic balls into the outer and inner rings of AISI 440C stainless steel.
- Longer grease life, by lower heat generation with ceramic balls.
- Less running cost by longer lifetime.
| Items | Unit | Silicon nitride Si3N4 |
Stainless steel AISI 440C |
Bearing steel SAE 52100 |
Superiority of ceramic ball |
|---|---|---|---|---|---|
| Density | g/cm3 | 3.2 | 7.8 | 7.8 | Lowering centrifugal force of balls |
| Heat expansion coefficient | X10-6/℃ | 3.2 | 10.5 | 12.5 | Small variation of internal clearance by temperature rise |
| Hardness | HV | 1400 | 700 | 740 | Less deformation and high rigidity |
| Young’s modulus | GPa | 320 | 200 | 210 | Reducing friction by high rigidity |
| Heat resistance | ℃ (℉) | 800 (1472) |
400 (752) |
180 (356) |
Maintaining rigidity capacity in high temperature |
| Conductivity | – | No | Yes | Yes | Preventing electric corrosion |
Product Specications
| Standard Specifications | |
|---|---|
| Inner and Outer Rings | AISI 440C |
| Balls | Silicon nitride（Si3N4） |
| Retainer | AISI 304 |
| Shield | AISI 304 |
| Seal | Fluorine rubber* |
| Lubricant | Heat-resistant fluorine grease |
| Radial clearance | C4 |
* Sealed type available up to 392°F
Performance
Durability in high temperature environment
* The above performance values are our test results and are not guaranteed values.
Precautions
Under high temperature environment, radial internal clearance is decreased depending on the difference of materials used for shaft, i.e. linear expansion coefficient, which may interfere with the rotation of the bearing. Please consider the thermal expansion sufficiently and select fitting and material of the shaft. Please contact us for further information.