71944 CD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71944 CD/HCP4ADBB
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71944 CD/HCP4ADBB Bearing Product Overview & Core Advantages
The 71944 CD/HCP4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This matched back-to-back arrangement (DB) provides superior stiffness and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class, it offers extremely tight dimensional and running accuracy. The use of ceramic balls and a phenolic cage enables superior high-speed performance and reduced rotational mass, making it ideal for high-precision, high-reliability spindle applications.
71944 CD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71944 | Basic bearing series and size designation (220mm bore, 300mm OD). |
| C | Designates a 15° contact angle, optimized for high-speed operation. |
| D | Indicates the bearing is part of a duplex (matched) set. |
| HC | Refers to the hybrid ceramic construction (steel rings with ceramic balls). |
| P4A | Specifies the ultra-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DB | Denotes the back-to-back mounting arrangement of the duplex pair. |
| B | Specifies a light preload (Class B) for optimal rigidity and running accuracy. |
71944 CD/HCP4ADBB Bearing Structural Features & Performance Benefits
- Enhanced Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing system rigidity and moment load capacity. This configuration effectively handles combined radial and axial loads from both directions.
- Superior High-Speed Capability: The combination of silicon nitride ceramic balls and a lightweight phenolic resin cage reduces centrifugal forces and inertial mass, enabling a high limiting speed of 11,000 rpm. The 15° contact angle is optimized for such high-speed applications.
- Ultra-Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration for exceptional rotational accuracy.
- Reduced Heat Generation & Long Service Life: Hybrid ceramic construction provides superior lubrication characteristics, reduced friction, and higher stiffness compared to all-steel bearings, leading to lower operating temperatures and extended service life.
71944 CD/HCP4ADBB Bearing Typical Application Areas
This precision duplex bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Machining Centers
- Advanced Robotics: Precision rotary joints and arm actuators.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
