71930 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71930 CD/P4ADGB
Basic Information
System of measurement
Metric
Weight
5 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
150 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
56 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
41850 lbf
Radial static load rating
58500 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71930 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71930 CD/P4ADGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a universally matchable (SU) set, it enables simplified assembly and optimal performance in preloaded configurations. Its core advantages include a 15° contact angle for effective handling of combined radial and axial loads, a P4A tolerance class for superior running accuracy, and a light preload (Class B) that ensures high system rigidity and minimizes deflection under operational stresses.
71930 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71930 CD/P4ADGB provides detailed technical specifications:
- 71930: Basic designation indicating a metric, angular contact ball bearing with a 150mm bore, 210mm OD, and 56mm width.
- C: Denotes a 15° contact angle.
- D: Indicates the bearing is part of a universally matchable (SU) pair for duplex mounting.
- P4A: Specifies the tolerance class, representing very high precision for both dimensional and running accuracy.
- DGB: Signifies a light preload (Class B) applied to the bearing set.
71930 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4A tolerance class and universal matchability (SU) ensure minimal runout and high system stiffness. The light preload eliminates internal clearance, providing superior positional accuracy and resistance to operational vibrations.
- Combined Load Capacity: The 15° contact angle is optimized to support significant combined loads, efficiently managing both radial forces and thrust loads in one direction.
- High-Speed Capability: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to the bearing's limiting speed of 11,000 rpm. This makes it a true high-speed bearing.
- Durability and Reliability: Manufactured from chrome steel for both rings and balls, the bearing ensures high fatigue life and durability. The open seal type allows for customized lubrication regimes to suit specific application needs.
71930 CD/P4ADGB Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where accuracy and speed are critical. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors.
- Aerospace Positioning Systems and Medical Equipment.
