Our 7900 ceramic ball angular contact ball bearing is designed and manufactured in strict accordance with the specifications of SKF and NSK 7900 models, realizing perfect interchangeability. It adopts high-purity silicon nitride (Si3N4) ceramic balls, which have significant advantages such as high hardness, wear resistance, corrosion resistance, and low thermal expansion coefficient compared with traditional steel balls. Combined with P2/P4/P5 high-precision grading processing, the bearing can maintain stable operation under high speed, high temperature and harsh working conditions, and effectively reduce noise, vibration and energy consumption. It is widely used in high-end machine tools, precision instruments, aerospace, medical equipment and other fields that require high precision and reliability.
1. Product Data Parameters
Parameter Item | Value | Unit | Remarks (Consistent with SKF/NSK 7900) |
|---|
Inner Diameter (d) | 10 | mm | Precision grinding, ISO 3290-1 tolerance |
Outer Diameter (D) | 22 | mm | - |
Width (B) | 6 | mm | - |
Precision Class | P2/P4/P5 | - | Optional, high-precision rotation |
Ball Material | Si3N4 Ceramic | - | High strength, high temperature resistance |
Ring Material | GCr15 / 440C Stainless Steel | - | 440C for corrosion resistance |
Limiting Speed (Oil) | 38000 | r/min | Higher than steel ball bearings |
Limiting Speed (Grease) | 28000 | r/min | - |
Radial Dynamic Load (C) | 3.25 | kN | - |
Axial Dynamic Load (Ca) | 1.62 | kN | - |
Radial Static Load (C0r) | 1.62 | kN | - |
Axial Static Load (C0a) | 1.05 | kN | - |
Contact Angle | 15° | - | Optimized for axial load |
Operating Temp Range | -40 ~ +200 | ℃ | Customizable for high temp |
2. Product Features
Perfect interchangeability with SKF/NSK 7900, no equipment modification needed
Si3N4 ceramic balls reduce friction and runout error, P2/P4/P5 precision grade
Excellent high-speed performance, stable operation at 38000 r/min (oil lubrication)
Optional 440C stainless steel ring, strong corrosion resistance in harsh environments
Low noise (<35dB) and energy saving, long service life (3-5x of steel ball bearings)
3. Application Scenarios
High-end CNC machine tool spindles/feed shafts
Precision metrology instruments, optical equipment
Aerospace navigation equipment, small aircraft engines
Medical high-speed centrifuges, precision surgical instruments
Electronic high-speed motors, precision gear sets
4. Installation & Maintenance
Use special tools for installation, avoid knocking bearing rings
Choose oil lubrication for high-speed, high-temp grease for high-temperature scenarios
Regularly check lubrication and cleanliness, clean and maintain in time
Store in sealed dry environment, avoid humidity and corrosion
