71938 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71938 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71938 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric system bearing features a back-to-back (DB) matched arrangement and an Extra Light (Class A) preload, making it ideal for handling combined radial and axial loads simultaneously. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy and stability, which is critical for high-speed, high-precision machinery. Its open design allows for customized lubrication solutions to optimize performance in specific operating conditions.
71938 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71938 | Basic bearing designation | Defines the standard bore (190mm), outside diameter (260mm), and width (66mm) dimensions. |
| C | 15° Contact Angle | Optimized for applications requiring a balance between axial and radial load capacity. |
| D | Duplex Back-to-Back (DB) Arrangement | Provides high moment rigidity and can accommodate axial loads in both directions. |
| P4A | High Precision Tolerance Class | Specifies extremely tight dimensional and running accuracy tolerances for superior performance. |
| DB | Universal Matching (Standard) | Indicates the two bearings in the set are universally matched for simplified mounting and optimal performance. |
| A | Extra Light Preload | Minimizes friction and heat generation, making it suitable for very high-speed applications. |
71938 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex back-to-back (DB) arrangement creates a large spread between load centers, significantly increasing the bearing's moment stiffness. This configuration enables it to handle substantial combined loads (radial and axial loads acting simultaneously) effectively.
Precision Performance: Manufactured to P4A tolerance class with a 15° contact angle, this bearing ensures minimal runout and vibration, which is paramount for maintaining precision in demanding applications.
High-Speed Capability: The combination of the lightweight, durable phenolic resin cage, extra light preload, and a 15° contact angle allows for a high limiting speed of 16,250 rpm, making it an excellent choice for high-speed spindles.
Material and Construction: The rings and balls are made from high-grade chrome steel, providing excellent wear resistance and fatigue life. The open seal type allows for the application of specialized lubricants to further enhance performance and temperature range capabilities.
71938 CD/P4ADBA Bearing Typical Application Areas
The 71938 CD/P4ADBA is engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Its primary applications 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 Equipment: Gyroscopes and other precision navigation instruments.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
