S71912 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71912 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.16 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3668 lbf
Radial static load rating
2655 lbf
Limiting speed
32.5 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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In Stock
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S71912 CEGA/HCP4A Bearing Product Overview & Core Advantages
The S71912 CEGA/HCP4A is a super-precision angular contact ball bearing designed for the most demanding applications. Engineered to a P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its key advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high rigidity, making it ideal for high-speed spindles and precision machinery. The combination of a ceramic ball material and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, establishing it as a top-tier solution for high-performance and high-reliability scenarios.
S71912 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S7 | Series designation for high-precision angular contact bearings | Indicates a premium, high-performance bearing family. |
| 1912 | Bore Diameter: 60 mm, Outside Diameter: 85 mm, Width: 13 mm | Specifies the critical bearing dimensions. |
| CE | 15° Contact Angle, Universal Matchable (SU) | Optimized for high-speed operation and can be universally paired with another identical bearing for duplex sets. |
| GA | Preload: Extra Light (Class A) | Provides minimal starting torque and is ideal for very high speeds where low friction is critical. |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Ceramic balls reduce weight, centrifugal force, and heat generation, enabling higher limiting speeds and longer life. |
| P4A | Tolerance Class (Super Precision) | Denotes extremely tight dimensional and running accuracy, superior to ABEC 7/ISO P4. |
S71912 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of silicon nitride (Si3N4) ceramic balls within a chrome steel ring structure significantly reduces friction and operating temperature. This results in a higher limiting speed (32,500 rpm), improved stiffness, and dramatically extended lubrication life compared to all-steel bearings.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance at high speeds, contributing to smooth operation and reduced vibration.
- Super-Precision P4A Tolerance: Manufactured to the strictest P4A tolerance class, this bearing ensures minimal runout and superior rotational accuracy, which is critical for applications like machine tool spindles.
- Optimized for Matched Sets: As a Universal Matchable (SU) bearing, it is supplied with selective tolerances that allow two bearings to be universally paired in a back-to-back (DB) or face-to-face (DF) arrangement without additional machining, simplifying installation and ensuring optimal preload and stiffness.
- Sealed & Grease-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within its specified temperature range.
S71912 CEGA/HCP4A Bearing Typical Application Areas
The S71912 CEGA/HCP4A is engineered for high-performance machinery requiring extreme precision, speed, and reliability. Key application areas include:
- High-Speed Machine Tool Spindles: CNC milling, grinding, and turning centers.
- Precision Robotic Drives: High-accuracy joints and arms.
- Medical & Dental Equipment: High-speed handpieces and scanners.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and avionics.
- High-Frequency Motors and Spindles: Where maximum rotational accuracy and speed are paramount.
