719/4C
Miniature Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Performance
Materials
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719/4C Bearing Product Overview & Core Advantages
The 719/4C is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a metric series bearing, it features a compact design with a 4 mm bore, 11 mm outside diameter, and 4 mm width. Its core advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high rigidity, making it an ideal choice for high-speed spindles and other precision machinery. Available in both Sealed and Open variants, and with options for Preload, it offers flexibility for various high-performance engineering requirements.
719/4C Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 719 | Denotes the super-precision angular contact bearing series. |
| 4 | Indicates the bore diameter of 4 mm. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
Note: This model is available with various options such as seal type (Sealed/Open), cage material (Nylon, Phenolic), ball material (Steel, Ceramic), and ABEC rating (P5/P4), which are specified separately in the full product ordering code.
719/4C Bearing Structural Features & Performance Benefits
The design of the 719/4C delivers significant performance benefits for demanding applications:
- High Rigidity and Precision: Manufactured to ABEC P5/P4 tolerance classes, this bearing ensures minimal runout and vibration, providing stable and precise rotation essential for high-precision machinery.
- Superior High-Speed Capability: The 15° contact angle and lightweight polymer cages (Nylon or Phenolic) contribute to lower centrifugal forces, enabling exceptional limiting speeds of up to 98,000 r/min with oil lubrication.
- Excellent Load Capacity: Despite its compact bearing dimensions, it offers a dynamic load rating of 181.86 lbf and a static load rating of 65.19 lbf, reliably supporting combined loads.
- Versatile Configuration: The bearing is Universal Matchable (SU), allowing two bearings to be mounted in a duplex arrangement to adjust preload and stiffness for optimal performance.
- Material Options: The availability of Ceramic balls (typically Silicon Nitride) further enhances high-speed performance, reduces weight, and increases service life by offering superior hardness and corrosion resistance.
719/4C Bearing Typical Application Areas
The 719/4C super-precision bearing is engineered for the most demanding sectors where speed, accuracy, and reliability are paramount. Key application areas include:
- High-Frequency Spindles: For PCB drilling, precision grinding, and milling machines.
- Medical and Dental Equipment: In high-speed handpieces and scanners.
- Aerospace and Defense: Gyroscopes, navigation systems, and instrumentation.
- Robotics and Automation: High-precision joints and servo motors.
- Test and Measurement Equipment: Where minimal rotational error is critical.
