71907 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 CD/P4ADBC
Basic Information
System of measurement
Metric
Weight
0.15 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
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2902 lbf
Limiting speed
56 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
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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71907 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71907 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Moderate / Class C standards, providing superior stiffness and stability under combined loads (radial and axial). Manufactured to P4A tolerance class, it delivers high running accuracy essential for demanding industrial machinery. The phenolic cage and optimized 15° contact angle contribute to its excellent high-speed performance and smooth operation.
71907 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing designation indicating a high-precision angular contact bearing series with a 35mm bore, 55mm OD, and 20mm width. |
| CD | Indicates a duplex pair in a back-to-back (DB) arrangement. This configuration provides high moment rigidity and is optimal for withstanding overturning moments. |
| P4A | Specifies the tolerance class, denoting very high precision with tight controls on bore, outer diameter, and width tolerances for superior running accuracy. |
| DBC | Indicates the specific preload level (Moderate / Class C) applied to the matched set, ensuring consistent stiffness and minimal axial/radial play. |
71907 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement and moderate preload create a highly rigid bearing system that effectively resists complex combined loads and moments, minimizing deflection under operation.
- Superior Precision: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore: -0.004mm to 0), this bearing ensures exceptional running accuracy and low vibration for precision applications.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the 15° contact angle is optimized for high-speed operation, supporting a limiting speed of 56,000 rpm.
- Optimized Load Capacity: With a dynamic load rating of 3578 lbf and a static load rating of 2902 lbf, the bearing is engineered to handle significant radial and axial forces simultaneously.
- Material Integrity: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and durability under demanding conditions.
71907 CD/P4ADBC Bearing Typical Application Areas
The 71907 CD/P4ADBC is ideally suited for high-performance machinery where precision, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring utmost accuracy.
- Precision Gearboxes: In robotics and automation systems for precise motion control.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational speeds are essential.
- Medical and Laboratory Equipment: Such as centrifuges and precision scanners.
- Aerospace Actuation Systems: For control surfaces and other critical mechanisms.
