71813 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71813 CD/P4DBB
Basic Information
System of measurement
Metric
Weight
0.25 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 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
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4972 lbf
Radial static load rating
6750 lbf
Limiting speed
36 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71813 CD/P4DBB Bearing Product Overview & Core Advantages
The 71813 CD/P4DBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This matched back-to-back (DB) arrangement is preloaded to Light / Class B standards, ensuring high system stiffness and minimal axial and radial runout. Its primary advantage lies in its ability to handle combined loads—simultaneous radial and axial forces—with superior performance, making it an ideal choice for high-precision, high-speed spindles and machinery.
71813 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71813 | Basic bearing designation, indicating a metric, light series angular contact ball bearing with a 65 mm bore, 85 mm OD, and 20 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4 | Denotes a high-precision tolerance class (P4), ensuring extremely tight dimensional and running accuracy for critical applications. |
| DB | Specifies the Back-to-Back (DB) matched arrangement. This configuration provides high moment rigidity and is effective in withstanding overturning moments. |
71813 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex back-to-back (DB) design and Light preload create an exceptionally rigid bearing system that minimizes deflection under load, crucial for maintaining precision in machining and positioning.
- Superior Load Capacity: Engineered to support significant combined loads. The 15° contact angle effectively manages axial loads from both directions in conjunction with high radial loads.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the high limiting speed of 36,000 rpm. The open design allows for efficient lubrication management.
- Premium Materials & Construction: Manufactured from chrome steel for rings and balls, ensuring high durability and fatigue life. The P4 tolerance class guarantees consistent, ultra-precise performance.
71813 CD/P4DBB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications where precision and speed are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes and tight tolerances.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational accuracy are critical.
- Industrial Pumps and Compressors: For shafts requiring rigid, preloaded support.
