71908 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71908 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.088 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2194 lbf
Radial static load rating
1350 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
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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71908 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71908 CEGA/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. As a single bearing designed for universal matching (SU), it enables simplified assembly into precisely preloaded pairs, delivering superior rotational accuracy and system rigidity. Its construction, featuring a phenolic cage and ceramic balls, is optimized for high-speed operation and extended service life, making it an ideal solution for high-reliability machinery.
71908 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| CEGA | Universal Matchable bearing set with a 15° contact angle and Extra Light preload (Class A). | Ensures simplified pairing for optimal preload control and system stiffness without selective assembly. |
| HC | Hybrid Ceramic (Silicon Nitride balls with steel rings). | Enables higher limiting speeds, reduced friction, and operation in marginal lubrication conditions. |
| P4A | High tolerance class equivalent to ABEC 7, with enhanced running accuracy requirements. | Guarantees exceptional rotational precision and minimal runout for critical applications. |
71908 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and increases the limiting speed to 56,000 rpm. This construction also offers superior resistance to wear and electrical arcing.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at high speeds, excellent acceleration/deceleration characteristics, and compatibility with a wide temperature range (-30°C to 110°C).
- 15° Contact Angle & Universal Match Design: The optimized contact angle provides an excellent balance between radial and axial load capacity. The universal matchable (SU) designation allows any two bearings to be paired without selective grinding, ensuring consistent preload (Extra Light / Class A) and simplifying inventory and assembly.
- Precision P4A Tolerances: Manufactured to P4A tolerance class, this bearing guarantees tight dimensional control (bore/OD tolerance: -0.004mm to 0) and superior running accuracy, which is critical for minimizing vibration and noise in precision spindles.
71908 CEGA/HCP4A Bearing Typical Application Areas
The 71908 CEGA/HCP4A is specifically designed for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: Dental handpieces, high-speed centrifuges, and imaging device rotors.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
