S71905 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71905 CDGB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.038 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
900 lbf
Limiting speed
83 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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S71905 CDGB/HCP4A Bearing Product Overview & Core Advantages
The S71905 CDGB/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. Engineered to a P4A tolerance class, it delivers exceptional running accuracy. Its core advantage lies in its ability to handle combined loads (radial and axial) simultaneously, making it ideal for applications requiring extreme rotational precision and stability. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact bearings. |
| 1905 | Bore size 25 mm, Outside diameter 42 mm, Width 9 mm. |
| CD | A 15° contact angle and specific internal design for high-speed operation. |
| GB | Indicates a universal matchable bearing designed to be paired in a back-to-back (DB) arrangement. |
| HC | Refers to the hybrid ceramic construction (steel rings with ceramic balls). |
| P4A | Denotes an ABEC 7 / ISO P4 tolerance class with additional running accuracy requirements. |
S71905 CDGB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds. It also provides inherent electrical insulation and superior resistance to wear.
- Phenolic Resin Cage: The lightweight and robust phenolic cage (often designated as TV or TN9) is ideal for high-speed applications, offering excellent strength and guidance with minimal friction.
- Precision & Rigidity: Manufactured to P4A super-precision standards, this bearing ensures minimal runout and vibration. Its design provides high rigidity, which is critical for maintaining accuracy under combined loads.
- Universal Matching (SU): The "GB" suffix signifies that bearings are universal matchable. When two bearings are mounted in a back-to-back arrangement, they create a preloaded set capable of supporting moment loads and bidirectional axial loads.
- Pre-lubrication: The bearing is pre-greased with a high-performance lubricant suitable for the specified temperature range, ensuring immediate operation and long-term reliability.
S71905 CDGB/HCP4A Bearing Typical Application Areas
The S71905 CDGB/HCP4A is engineered for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and radar systems.
