71814 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71814 CD/P4DBB
Basic Information
System of measurement
Metric
Weight
0.27 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
70 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 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
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5062 lbf
Radial static load rating
7200 lbf
Limiting speed
28 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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71814 CD/P4DBB Bearing Product Overview & Core Advantages
The 71814 CD/P4DBB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Light / Class B specifications, ensuring optimal stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting significant radial and axial forces. Manufactured to P4 tolerance class, it is ideal for high-speed, high-precision spindles and other critical machinery where uncompromising performance is required.
71814 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71814 | Basic bearing designation, indicating a metric, super-precision angular contact bearing with a 70mm bore, 90mm OD, and 20mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and high axial load capacity. |
| D | Indicates the bearing is part of a duplex pair (two bearings supplied as a matched set). |
| P4 | Specifies the tolerance class (P4), denoting very high precision with tight dimensional and running accuracy tolerances. |
| DB | Defines the matched arrangement as Back-to-Back (DB). This configuration provides high moment rigidity and excellent stability under complex loads. |
71814 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, making it exceptionally stable under combined loads.
- Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 5062 lbf, this bearing is engineered to handle high radial loads and substantial axial loads in both directions simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and ensures stable operation at the high limiting speed of 28,000 rpm. The open design allows for efficient lubrication management.
- Exceptional Precision: Manufactured to ABEC 7 / P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and positional accuracy in precision machinery.
- Premium Material Construction: The rings and balls are made from high-grade chrome steel, providing excellent wear resistance and long-term dimensional stability.
71814 CD/P4DBB Bearing Typical Application Areas
This precision angular contact ball bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors requiring high rotational accuracy.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other instrumentation requiring ultra-precise rotation.
