71830 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71830 CD/P4DBB
Basic Information
System of measurement
Metric
Weight
2.2 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
150 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
35
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
18720 lbf
Radial static load rating
32850 lbf
Limiting speed
11 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
No drawings available at the moment, will be launched soon
Price:
$ 739.66
/ each
In Stock
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71830 CD/P4DBB Bearing Product Overview & Core Advantages
The 71830 CD/P4DBB is a precision angular contact ball bearing configured as a duplex back-to-back (DB) matched set. Engineered to the exacting P4 tolerance class, this bearing is designed for applications demanding exceptional rotational accuracy and high system rigidity. Its primary advantage lies in its ability to support combined loads—significant radial loads alongside substantial axial loads in both directions—making it an ideal choice for high-precision spindles and other critical machinery components. The matched set, preloaded for light preload (Class B), ensures optimal stiffness and minimal runout right from installation.
71830 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71830 | Basic bearing designation | Defines the bore (150 mm), outside diameter (190 mm), and width (40 mm). |
| C | 15° Contact Angle | Optimized for high-speed operation and a balanced capacity for radial and axial loads. |
| D | Duplex Back-to-Back (DB) arrangement | Provides high moment rigidity and stable axial positioning under complex loads. |
| P4 | Tolerance Class | Denotes ultra-precision manufacturing with extremely tight dimensional and running accuracy tolerances. |
| DBB | Duplex Back-to-Back (DB) Light Preload | Specifies the bearings are supplied as a factory-matched and preloaded pair for immediate high-performance use. |
71830 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and tilting. This setup, combined with a 15° contact angle and high-grade chrome steel construction, enables the bearing to handle high radial dynamic load ratings of 18,720 lbf and radial static load ratings of 32,850 lbf.
- High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces and ensures stable operation at the high limiting speed of 11,000 rpm. The open design and factory lubrication facilitate efficient heat dissipation.
- Precision & Accuracy: Manufactured to P4 tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing guarantees minimal runout and superior rotational accuracy for precision applications.
- Optimized for Performance: The bearings are supplied as a matched set with a light preload already applied, eliminating the need for complex on-site adjustment and ensuring immediate, consistent performance.
71830 CD/P4DBB Bearing Typical Application Areas
This precision duplex bearing set is engineered for high-performance applications where accuracy, speed, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Spindles for routers and other high-RPM equipment.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
