71920 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71920 CD/P4ADBA
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 Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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:
$ 391.06
/ each
In Stock
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71920 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71920 CD/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement is preloaded to Extra light / Class A specifications, ensuring minimal axial and radial play for superior system stability. Its primary advantage lies in its ability to handle combined loads—significant radial forces alongside thrust loads in both directions—making it an ideal choice for high-precision, high-rigidity spindles and machinery.
71920 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 CD/P4ADBA provides detailed technical specifications:
- 71920: Basic bearing series, indicating a high-precision, light-series angular contact design with a 100mm bore.
- C: Denotes a 15° contact angle, optimized for high-speed operation with moderate axial load capacity.
- D: Indicates the bearing is part of a Duplex (paired) set.
- P4A: Specifies a very high tolerance class (superior to ABEC 7), guaranteeing extreme dimensional and running accuracy.
- DB: Defines the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
- A: Specifies the Extra light preload level within the matched set, minimizing friction and heat generation at high speeds.
71920 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement of two bearings creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under load.
- Superior Precision: Manufactured to P4A tolerance class with tight bore, OD, and width tolerances, this bearing ensures exceptional running accuracy and minimal vibration.
- Optimized High-Speed Performance: The 15° contact angle and phenolic resin cage reduce centrifugal forces and friction, enabling stable operation up to the specified limiting speed.
- High Load Capacity: With a dynamic load rating of 21,938 lbf and static load rating of 29,700 lbf, it reliably handles significant combined radial and axial loads.
- Durability: Constructed from chrome steel for both rings and balls, the bearing offers high wear resistance and long service life.
71920 CD/P4ADBA Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors and Robotic Drives.
- Medical Equipment: High-speed centrifuges and imaging devices.
