71907 CBGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 CBGB/P4A
Basic Information
System of measurement
Metric
Weight
0.078 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
10 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1141 lbf
Radial static load rating
821 lbf
Limiting speed
56 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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Product Overview and Core Advantages
The 71907 CBGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing in a Universal Matchable (SU) pair, it is engineered to handle combined loads, particularly high-speed axial loads from one direction. Its P4A tolerance class ensures ultra-precise running, making it ideal for high-reliability, high-performance machinery where minimal runout and vibration are critical.
71907 CBGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series, indicating a super-precision, light-weight angular contact design with a 35mm bore. |
| C | A 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| B | Specifies a Light preload (Class B), which reduces axial and radial play for enhanced system stiffness and precise shaft positioning. |
| G | Indicates the bearing is Universal Matchable (SU), allowing two identical bearings to be mounted together in a back-to-back (DB) or face-to-face (DF) arrangement to handle combined or moment loads. |
| P4A | Denotes an ABEC 7 / ISO P4 precision tolerance class with additional running accuracy requirements for the tightest tolerances on bore, OD, and width. |
Structural Features and Performance Benefits
- High Rigidity and Precision: The phenolic resin cage and P4A tolerance class contribute to exceptional dimensional stability and low vibration, enabling smooth operation at high speeds. The light preload eliminates internal clearance, providing superior system stiffness.
- Optimized Load Capacity: With a 15° contact angle, this bearing is engineered to support significant axial loads in one direction while also accommodating radial loads. Its high dynamic load rating of 1141 lbf ensures long service life under demanding conditions.
- Superior High-Speed Performance: The lightweight phenolic cage and optimized internal geometry allow for a high limiting speed of 56,000 rpm, making it a true high-speed bearing solution.
- Universal Matching Capability: The Universal Matchable (SU) designation means bearings can be directly paired without selective mounting, simplifying assembly and ensuring optimal preload and performance in duplex sets.
71907 CBGB/P4A Bearing Typical Application Areas
This bearing is specified for high-precision, high-speed rotational systems, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial High-Speed Pumps and Compressors
- Aerospace Gyroscopes and Instrumentation
