71920 CD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 CD/P4ADGA
Basic Information
System of measurement
Metric
Weight
1.6 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
21938 lbf
Radial static load rating
29700 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 756.19
/ each
In Stock
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71920 CD/P4ADGA Bearing Product Overview & Core Advantages
The 71920 CD/P4ADGA is a super-precision angular contact ball bearing designed for the most demanding applications. As a universal matchable (SU) bearing supplied in a pre-set duplex pair, it is engineered to provide exceptional rotational accuracy, high rigidity, and reliable performance under combined radial and axial loads. Its P4A tolerance class and extra light preload (Class A) make it an ideal choice for high-speed spindles and other precision machinery where minimal runout and thermal stability are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series, indicating a super-precision, 100mm bore, 140mm OD, 40mm width angular contact design. |
| C | 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is one of a universally matchable (SU) pair. Two such bearings can be mounted in any combination (DB, DF, DT) to achieve the required stiffness and load configuration. |
| P4A | Tolerance class exceeding ABEC 7/ISO P4, with additional specifications for running accuracy. Ensures extremely low vibration and precise rotation. |
| DGA | Suffix combination indicating the specific preload grade (Extra light / Class A) and that the bearing is supplied lubricated and ready for installation. |
71920 CD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair arrangement creates a highly rigid bearing system capable of supporting significant combined loads (radial and axial loads acting simultaneously). The universal match design provides flexibility in application engineering.
- Super-Precision Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on bore, outside diameter, and width. This results in superior running accuracy, reduced vibration, and enhanced machine tool finish.
- Optimized High-Speed Capability: The 15° contact angle and phenolic resin cage are engineered for high-speed operation (limiting speed of 16,000 rpm). The cage offers low weight, high strength, and excellent sliding properties.
- Pre-Lubricated for Immediate Use: The bearing is factory-filled with high-quality grease suitable for the specified temperature range (-30°C to 110°C), ensuring immediate startup and long-term, maintenance-free operation in many applications.
71920 CD/P4ADGA Bearing Typical Application Areas
The 71920 CD/P4ADGA is specifically engineered for high-precision, high-speed machinery. Key application areas include:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling spindles requiring extreme accuracy.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Precision Instrumentation: Rotary encoders, measuring devices, and optical scanners.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical rotational systems.
