71948 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71948 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
5.98 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
240 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
320 mm
Outside diameter tolerance
-0.015mm to 0
Width
38 mm
Width tolerance
-0.24mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
31
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
51525 lbf
Radial static load rating
73125 lbf
Limiting speed
7 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 6163.95
/ each
In Stock
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71948 CD/HCP4A Bearing Product Overview & Core Advantages
The 71948 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 15° contact angle and is supplied with a preload, making it ideal for setups where minimal shaft deflection and high system stiffness are critical. Its construction with a phenolic cage and ceramic balls contributes to lower friction, higher limiting speeds, and superior performance in high-speed operations. The bearing is pre-lubricated and operates effectively within a wide temperature range, offering reliable service in precision machinery.
71948 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a high-precision duplex bearing arrangement with a specific preload and contact angle optimization for high rigidity and accuracy. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce weight, centrifugal force, and heat generation, enabling higher speeds. |
| P4 | Denotes an ultra-precision tolerance class (ABEC-7 / ISO P4), ensuring extremely tight dimensional and running accuracy for critical applications. |
| A | Specifies a 30° contact angle (Note: The provided spec indicates 15°. In this context, 'A' may refer to a standard angular contact design with a specific preload or internal geometry). |
71948 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The angular contact design combined with a preload ensures maximum system stiffness and precise shaft positioning, minimizing runout under load.
- Superior High-Speed Capability: The hybrid ceramic balls and lightweight phenolic resin cage significantly reduce rotational mass and friction, allowing for a high limiting speed of 7,000 rpm.
- Excellent Load Capacity: Engineered to handle combined radial and axial loads simultaneously, with high dynamic and static load ratings for long service life.
- Optimized for Precision: Manufactured to P4 tolerance class, this bearing guarantees exceptional running accuracy and low noise/vibration levels.
- Wide Operating Range: The standard lubrication and material selection provide stable performance across a temperature range from -30°C to 110°C.
71948 CD/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and imaging scanner rotors.
- High-Frequency Motors and Spindles: Applications requiring minimal friction and heat generation at extreme rotational speeds.
