719/4AC
Miniature Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
719/4AC Bearing Product Overview & Core Advantages
The 719/4AC is a miniature double row angular contact ball bearing designed for applications requiring exceptional precision and reliability. This high-precision bearing excels at simultaneously handling combined loads, including radial loads and bidirectional axial loads, thanks to its optimized 25° contact angle. Its compact design, with a 4mm bore and 11mm outside diameter, makes it ideal for space-constrained, high-performance mechanisms. Available in both sealed and open variants, and with options for steel or ceramic balls, it offers superior high-speed capability and operational stability.
719/4AC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 719 | Series designation for miniature, high-precision angular contact bearings. |
| 4 | Bore diameter of 4 mm. |
| AC | Angular Contact ball bearing design. |
Common Suffix Options (Not part of base model 719/4AC):
- Sealed/Open: Indicates the presence of seals or an open design for different lubrication strategies.
- P5 / P4: Denotes ABEC-5 or superior ABEC-11 precision classes for ultra-high running accuracy.
- Universal Matchable (SU): Bearings are pre-manufactured to be universally matchable, allowing for simplified preload arrangement without selective mounting.
719/4AC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The double row ball complement and 25° contact angle provide significantly higher radial and axial stiffness compared to single row designs, enabling stable performance under combined loads.
- Superior High-Speed Performance: The use of lightweight Nylon or Phenolic cages minimizes centrifugal forces, reducing friction and heat generation, which is critical for achieving high rotational speeds.
- Exceptional Precision: Manufactured to ABEC-5 (P5) or ABEC-11 (P4) tolerance classes, these bearings ensure minimal runout and vibration for applications demanding extreme accuracy.
- Flexible Configuration: The Universal Matchable (SU) design allows for easy creation of preloaded bearing pairs (back-to-back, face-to-face, or tandem) without the need for selective assembly, simplifying installation and enhancing system rigidity.
- Material Options: The availability of Ceramic balls (Silicon Nitride) offers advantages such as reduced weight, higher speed capability, electrical insulation, and longer service life in demanding environments.
719/4AC Bearing Typical Application Areas
The 719/4AC precision bearing is engineered for high-performance applications where compact size, high speed, and accuracy are paramount. Key industries and equipment include:
- High-Speed Spindles: For PCB drilling, dental handpieces, and small precision machining centers.
- Precision Instruments: Used in optical encoders, gyroscopes, and laboratory equipment.
- Robotics: Ideal for small robotic joints, actuators, and harmonic drive systems.
- Medical Devices: Found in miniature motors for surgical tools and diagnostic scanners.
- Aerospace & Defense: Applied in guidance systems, instrumentation, and avionics.
