719/8C
Miniature Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Performance
Materials
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719/8C Bearing Product Overview & Core Advantages
The 719/8C is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Engineered with a 15° contact angle, it efficiently handles combined loads (radial and axial) in one direction. Available in both Sealed and Open variants, and with options for Preload and Universal Matchable (SU) arrangements, it offers design flexibility for high-rigidity systems. Its compact dimensions (8 mm bore, 19 mm OD, 6 mm width) make it ideal for high-precision spindles and other demanding machinery.
719/8C Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 719 | Series designation for super-precision, high-speed angular contact ball bearings. |
| 8 | Nominal bore diameter in millimeters (8 mm). |
| C | Designates a 15° contact angle, optimized for high-speed operation and requiring less axial preload. |
719/8C Bearing Structural Features & Performance Benefits
High-Speed Capability: The 719/8C is engineered for extreme rotational velocities, with a grease limited speed of 64,000 r/min and an oil limited speed of 68,000 r/min. This is facilitated by precision-ground components and optimized internal geometry.
Super-Precision & Rigidity: Manufactured to ABEC P5/P4 tolerance classes, this bearing ensures minimal runout and vibration. The angular contact design, especially when preloaded or arranged in a Universal Match (SU) set, provides high system rigidity and precise shaft positioning.
Material & Lubrication Options: The cage is available in lightweight Nylon or Phenolic materials, reducing centrifugal forces for higher speeds. Ball options include standard Steel or high-performance Ceramic (Si3N4) for enhanced speed and longevity. The bearing comes lubricated for immediate operation.
Load Capacity: With a dynamic load rating of 449.6 lbf and a static load rating of 195.58 lbf, it provides reliable performance under significant combined loads.
719/8C Bearing Typical Application Areas
The 719/8C precision bearing is ideally suited for applications where high rotational speed and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and drilling spindles.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Robotics: High-precision joints and actuators.
