S71905 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71905 CDGA/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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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S71905 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71905 CDGA/HCP4A is a super-precision angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. As a universally matchable single bearing, it is designed to be paired with an identical bearing to form a duplex set, enabling it to handle significant combined loads (radial and axial) simultaneously. Its core advantages stem from its P4A tolerance class, ceramic balls, and phenolic cage, which collectively deliver exceptional rotational accuracy, minimal heat generation, and extended service life under extreme operating conditions.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71905 | Precision angular contact ball bearing series with a 25 mm bore and 42 mm outside diameter. |
| C | 15° contact angle. |
| DG | Universal Matchable (SU designation). The bearing is designed for universal mounting (any face-to-face, back-to-back, or tandem arrangement) when paired with another identical bearing. |
| A | Extra light preload (Class A). |
| HCP4A | Indicates the tolerance class P4A (geometrically superior to ABEC 7) and the use of a phenolic cage. |
S71905 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Super-Precision & High Rigidity: Manufactured to a P4A tolerance class, this bearing ensures extremely tight dimensional and running accuracy, providing superior system rigidity and positional stability.
- Enhanced High-Speed Performance: The combination of silicon nitride ceramic balls and a lightweight phenolic cage reduces centrifugal forces and friction, enabling a high limiting speed of 83,000 rpm. This design also minimizes heat buildup.
- Superior Load Capacity: The 15° contact angle and universal matchability allow configured duplex sets to efficiently support combined loads, including high-speed axial loads.
- Pre-Lubricated & Sealed: The bearing is pre-lubricated with grease and features seals, protecting against contamination and providing maintenance-free operation within its specified temperature range of -30°C to 110°C.
S71905 CDGA/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications requiring extreme precision and speed, such as:
- Machine Tool Spindles
- High-Frequency Spindles for PCB drilling and routing
- Precision Grinding Spindles
- High-Speed Automation & Robotics
- Medical Device Drives
