71920 CD/P4ADFB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71920 CD/P4ADFB
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
Duplex Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71920 CD/P4ADFB Bearing Product Overview & Core Advantages
The 71920 CD/P4ADFB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex bearing set, arranged in a Face-to-Face (DF) configuration, is preloaded to Class B (Light) to ensure minimal axial and radial play, providing superior system stability. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads from both directions—simultaneously. Manufactured to the exacting P4A tolerance class, it is the ideal choice for high-speed spindles and other precision machinery where high rigidity and running accuracy are paramount.
71920 CD/P4ADFB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 CD/P4ADFB is decoded as follows:
- 71920: The basic bearing designation, indicating a 100 mm bore, 140 mm outside diameter, and 40 mm width.
- C: Denotes a 15° contact angle, optimized for high axial load capacity.
- D: Signifies that the bearing is part of a Duplex (paired) set.
- P4A: Indicates an ultra-precision tolerance class exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy.
- DF: Specifies the Duplex Face-to-Face mounting arrangement, which provides high rigidity and is tolerant to misalignment.
- B: Identifies the Light preload applied to the bearing set, eliminating internal clearance for precise shaft positioning.
71920 CD/P4ADFB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex DF arrangement and light preload create an exceptionally rigid bearing system that resists deflection under load, crucial for maintaining precision in machining and positioning applications.
- Superior Load Capacity: With a 15° contact angle and robust construction, this bearing is engineered to support high combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces, while the precision-ground components contribute to a high limiting speed of 16,000 rpm, making it suitable for high-speed spindle applications.
- Precision Performance: The P4A tolerance class guarantees minimal runout and vibration, which is essential for achieving superior surface finishes and high operational accuracy.
- Durability: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers excellent wear resistance and long service life under demanding conditions.
71920 CD/P4ADFB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Industrial Pumps and Compressors
- Precision Measuring Instruments
