71938 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
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71938 CD/P4A Bearing Product Overview & Core Advantages
The 71938 CD/P4A is a single-row angular contact ball bearing engineered for applications demanding exceptional precision and rigidity. Designed to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 15° contact angle optimized for high axial load capacity. Manufactured to P4 (ABEC-7) tolerance class, it delivers superior running accuracy, making it ideal for high-speed, high-precision machinery. The preloaded configuration ensures minimal axial play, providing immediate system responsiveness and enhanced operational stability.
71938 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing designation (190mm bore, 260mm OD, 33mm width) |
| CD | Specific internal design with optimized contact angle and internal clearance for high rigidity |
| P4 | Tolerance class equivalent to ABEC-7, ensuring ultra-precision performance |
| A | Indicates a preload condition for enhanced stiffness and reduced vibration |
71938 CD/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The single-row angular contact design, combined with P4 precision and preload, delivers exceptional system stiffness and running accuracy, critical for maintaining positional stability under load.
Optimized Load Capacity: With a 15° contact angle, this bearing efficiently handles significant axial loads in one direction while supporting substantial radial loads. The radial dynamic load rating of 38,700 lbf and static load rating of 49,500 lbf ensure reliable performance in demanding applications.
High-Speed Capability: The phenolic resin cage offers low mass and excellent sliding properties, contributing to a high limiting speed of 7,500 rpm. This makes the bearing suitable for high-speed spindles and other rapid-rotation equipment.
Material & Lubrication: Constructed from chrome steel for rings and balls, the bearing provides high durability and fatigue resistance. It is supplied lubricated for immediate operation within a wide temperature range of -30°C to 110°C.
71938 CD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring superior rigidity and accuracy.
- High-Speed Machining Centers: Applications demanding high rotational speeds and minimal runout.
- Precision Gearboxes: Where accurate shaft positioning and load capacity are critical.
- Industrial Pumps & Compressors: For handling axial and radial loads in rotating assemblies.
- Robotic Arm Joints & Precision Rotary Tables: Providing high stiffness and precise motion control.
