71905 CDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.042 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
900 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71905 CDGC/P4A Bearing Product Overview & Core Advantages
The 71905 CDGC/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and moderate preload. Operating under the P4A tolerance class, it delivers exceptional dimensional accuracy and rotational precision. Its 15° contact angle is optimized to handle significant combined loads (radial and axial), making it a compact, high-performance solution for precision spindles and other critical machinery requiring superior running accuracy and rigidity.
71905 CDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation indicating a lightweight, ultra-precision series with a 25 mm bore. |
| CD | Specifies a 15° contact angle and a moderate preload (Class C). |
| GC | Indicates the bearing is part of a Universal Matchable (SU) set, allowing for precise axial play adjustment when mounted in pairs. |
| P4A | Denotes an ultra-precision tolerance class superior to ABEC 7, ensuring minimal runout and vibration for high-speed applications. |
71905 CDGC/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance with a phenolic resin cage, this bearing provides exceptional dimensional stability and high-speed capability, contributing to superior system rigidity and accuracy.
- Optimized Load Capacity: The 15° contact angle is engineered to efficiently support combined radial and axial loads, making it ideal for complex loading conditions.
- High-Speed Performance: The lightweight phenolic cage and optimized internal geometry enable a high limiting speed of 100,500 rpm, suitable for demanding spindle applications.
- Universal Matching: Designated as Universal Matchable (SU), these bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to create a pre-loaded set that manages bidirectional axial loads and moments.
71905 CDGC/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Rotary Systems
- High-Frequency Motors
- Medical & Dental Equipment Spindles
- Aerospace Instrumentation
