71944 CD/HCP4ADGB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71944 CD/HCP4ADGB
Basic Information
System of measurement
Metric
Weight
11.1 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
220 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
300 mm
Outside diameter tolerance
-0.004mm to 0
Width
76 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
80550 lbf
Radial static load rating
135000 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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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71944 CD/HCP4ADGB Bearing Product Overview & Core Advantages
The 71944 CD/HCP4ADGB is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. As a universally matchable (SU) bearing supplied in a pre-set pair, it is designed to accommodate combined loads (radial and axial) simultaneously. Its core advantages stem from a P4A super-precision tolerance class, a light preload (Class B) for optimal rigidity and running accuracy, and the use of ceramic balls which significantly enhance high-speed performance and service life. This configuration provides a compact, high-performance solution for the most critical spindle arrangements.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series and size designation (220mm bore, 300mm OD). |
| CD | Indicates a universal matchable (SU) bearing designed in a 15° contact angle duplex pair. This arrangement provides high rigidity and can accommodate axial loads in both directions when mounted face-to-face or back-to-back. |
| HC | Signifies the use of Hybrid Ceramic components, specifically ceramic balls (Si3N4), which reduce centrifugal forces, lower operating temperatures, and enable higher limiting speeds. |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards. This ensures extremely tight dimensional and running accuracy for applications requiring minimal runout and vibration. |
| DGB | Indicates a Light Preload (Class B). This preload eliminates internal clearance, increasing system stiffness and improving rotational accuracy for superior performance under load. |
71944 CD/HCP4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: The universal matchable (SU) duplex pair with a light preload creates an exceptionally stiff bearing system, minimizing deflection under load and ensuring precise shaft positioning. The P4A tolerance class guarantees minimal runout.
- Superior High-Speed Performance: The combination of hybrid ceramic balls and a phenolic resin cage is key to achieving the high limiting speed of 11,000 rpm. Ceramic balls are lighter, reducing centrifugal loads and friction, while the phenolic cage offers excellent strength-to-weight ratio and smooth operation at high velocities.
- Enhanced Load Capacity: With a 15° contact angle and a duplex design, this bearing efficiently handles significant combined radial and axial loads. The high-grade chrome steel rings and ceramic balls contribute to its high dynamic (80,550 lbf) and static (135,000 lbf) load ratings.
- Optimized for Precision Applications: The open seal type allows for custom lubrication schemes to further optimize performance for specific speed and temperature conditions, making it ideal for precision machinery.
71944 CD/HCP4ADGB Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- High-Frequency Machine Tool Spindles: CNC milling centers, grinding spindles, and precision lathes.
- High-Speed Robotic Drives: Arm joints and precision gearboxes requiring high rigidity and accuracy.
- Precision Medical Equipment: Dental handpieces, imaging scanner gantries, and laboratory automation.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation and control mechanisms.
