71902 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71902 CDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.015 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
15 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
28 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
893 lbf
Radial static load rating
428 lbf
Limiting speed
230 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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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71902 CDGB/P4A Bearing Product Overview & Core Advantages
The 71902 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing from a Universal Matchable (SU) set, it is engineered to carry combined loads, accommodating significant radial loads and thrust loads in one direction. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-rigidity, high-reliability spindles and precision machinery. The phenolic cage and optimized internal geometry contribute to its superior high-speed capabilities.
71902 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD). |
| C | 15° contact angle, optimized for high-speed applications and thrust load capacity. |
| D | Specifies a phenolic (resin) cage material, ideal for high speeds and reduced friction. |
| G | Indicates a light preload (Class B), which increases bearing rigidity and minimizes runout. |
| B | Denotes a 40° bearing contact angle modification (from universal matching specification). |
| /P4A | The tolerance class, signifying extremely tight dimensional and running accuracy standards for precision spindles. |
71902 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: The P4A tolerance class and light preload work in concert to provide exceptional system stiffness and minimal axial/radial runout, which is critical for machining precision and surface finish quality.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the 15° contact angle is optimized for high rotational speeds, enabling a limiting speed of 230,000 rpm (dmN).
- Precision Load Capacity: Engineered to handle combined radial and axial loads simultaneously, with a dynamic load rating of 893 lbf and a static load rating of 428 lbf.
- Universal Matching Design: As part of a Universal Matchable (SU) set, this bearing can be universally paired with another bearing from the same set to form a rigid, preloaded duplex arrangement without the need for selective mounting.
71902 CDGB/P4A Bearing Typical Application Areas
This super-precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, dental handpieces, and small motorized spindles.
- High-Speed Automation: Robotics, pick-and-place units, and encoder systems.
- Medical Equipment: High-speed dental drills and surgical hand tools.
