71921 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71921 CDGA/P4A
Basic Information
System of measurement
Metric
Weight
0.82 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
145 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
13905 lbf
Radial static load rating
15638 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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:
$ 254.45
/ each
In Stock
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71921 CDGA/P4A Bearing Product Overview & Core Advantages
The 71921 CDGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with Universal Matchable (SU) designation, it can be precisely paired with another identical bearing to form a preloaded duplex set, optimizing performance for combined loads. Its P4A tolerance class and extra light preload (Class A) ensure superior running accuracy, making it ideal for high-speed spindles and other precision machinery.
71921 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71921 CDGA/P4A is decoded as follows:
- 71921: Basic bearing series and size designation (105mm bore, 145mm OD, 20mm width).
- C: 15° contact angle, optimized for high-speed applications.
- D: Signifies a universal matchable bearing designed for duplex pairing.
- G: Indicates a preload grade.
- A: Denotes Extra Light preload (Class A).
- P4A: The tolerance class, representing very high precision levels for both dimensional and running accuracy.
71921 CDGA/P4A Bearing Structural Features & Performance Benefits
- High Precision and Rigidity: Manufactured to P4A tolerance class, this bearing provides extremely tight dimensional control for superior system rigidity and minimal runout. The phenolic cage offers excellent dimensional stability and is well-suited for high-speed operation.
- Optimized for Combined Loads: The 15° contact angle is engineered to efficiently handle combined radial and axial loads simultaneously, a critical requirement in precision spindle applications.
- Superior High-Speed Performance: The combination of the lightweight phenolic cage, precision-ground chrome steel components, and optimized internal geometry allows for a high limiting speed of 16,000 rpm.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, two 71921 CDGA/P4A units can be mounted together in various preloaded arrangements (e.g., back-to-back, face-to-face) to achieve the exact stiffness and running characteristics required by the application.
71921 CDGA/P4A Bearing Typical Application Areas
This precision angular contact bearing is predominantly used in high-performance applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and lathes.
- High-Frequency Motors and High-Speed Drives.
- Precision Instrumentation and measuring equipment.
- Aerospace components and auxiliary systems.
