71934 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71934 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71934 CD/P4ADBA is a 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 Extra Light (Class A) specifications, ensuring minimal axial and radial runout under high-speed operation. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside thrust loads in both directions—making it ideal for high-precision spindles. Manufactured to the stringent P4A tolerance class, this bearing offers superior dimensional stability and performance consistency.
71934 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71934 | Basic bearing series and size designation | Defines the core dimensions: 170 mm bore, 230 mm OD. |
| CD | Duplex Back-to-Back arrangement | Two bearings are mounted opposing each other, providing high moment rigidity and the ability to handle bidirectional axial loads. |
| P4A | High-Precision Tolerance Class | Exceeds standard ABEC 7 precision, ensuring extremely tight running accuracy for high-speed applications. |
| DB | Universal matching (Not applicable) | This is a standard, pre-matched set of two bearings, ready for installation without further selection. |
| A | Light Preload | Optimizes bearing stiffness and minimizes deflection at high speeds while controlling heat generation. |
71934 CD/P4ADBA Bearing Structural Features & Performance Benefits
Optimized Internal Geometry & Material Selection: The 15° contact angle provides an excellent balance between radial and axial load capacity. The phenolic resin cage offers superior guidance, low friction, and is ideal for high-speed operation up to 16,250 rpm. The use of high-grade chrome steel for both rings and balls ensures high durability and fatigue life under dynamic loads.
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads. With a dynamic load rating of 47,700 lbf and a static load rating of 75,375 lbf, this bearing set is engineered for demanding applications.
Precision & Speed Performance: The P4A tolerance class guarantees minimal runout, which is critical for achieving high surface finishes and machining accuracy. The combination of the lightweight phenolic cage and optimized internal design enables the high limiting speed.
Lubrication & Temperature Range: The bearing is pre-lubricated for immediate operation and performs reliably within a temperature range of -30°C to 110°C.
71934 CD/P4ADBA Bearing Typical Application Areas
The 71934 CD/P4ADBA is specified for high-performance machinery where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
