709AC
Miniature Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Performance
Materials
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709AC Bearing Product Overview & Core Advantages
The 709AC angular contact ball bearing is a precision bearing engineered for applications demanding high rotational accuracy and reliability. As a double row angular contact ball bearing, it is specifically designed to support combined loads, simultaneously handling significant radial loads and axial loads in both directions. Its compact bearing dimensions (9 mm bore, 24 mm OD, 7 mm width) make it ideal for space-constrained, high-performance assemblies. Available in both sealed and open configurations, and with options for steel or ceramic balls, it offers exceptional versatility for high-speed and high-rigidity applications.
709AC Bearing Model Code Explained, Specifications & Naming Convention
The model number 709AC and its available options denote specific technical features:
- 709AC: Base model number indicating the bearing dimensions and a 25° contact angle.
- Seal Type: Available as Sealed (for contaminant exclusion) or Open (for maximum speed and relubrication capability).
- Preload: Available to eliminate internal clearance, enhancing system rigidity and rotational accuracy.
- Matched Arrangement: Universal Matchable (SU), allowing bearings to be mounted in pairs or sets in any combination to achieve desired preload and stiffness.
- Ball Material: Steel (standard) or Ceramic (for higher speed, reduced weight, and longer life).
- Cage Material: Nylon or Phenolic, contributing to low friction, quiet operation, and high-speed capability.
- ABEC Rating: P5 (ABEC-5) or P4 (ABEC-32), denoting very high precision levels for smooth, accurate rotation.
709AC Bearing Structural Features & Performance Benefits
The design of the 709AC delivers distinct performance advantages:
- High Rigidity & Load Capacity: The double row design and 25° contact angle provide superior high rigidity and the ability to support substantial combined loads (radial and bidirectional axial loads) in a single, compact unit.
- Exceptional High-Speed Performance: Optimized internal geometry, lightweight Nylon or Phenolic cages, and the option for Ceramic balls enable maximum rotational speeds, with an oil-lubricated limit of 85,000 r/min.
- Precision Operation: Manufactured to ABEC P5/P4 tolerance classes, this precision bearing ensures minimal runout and vibration for sensitive applications.
- Versatile Configuration: The Universal Matchable (SU) feature provides design flexibility, allowing engineers to create custom preloaded sets for optimal system performance.
709AC Bearing Typical Application Areas
The 709AC is ideally suited for demanding applications across various industries, including:
- High-Speed Spindles for CNC machining centers, routers, and grinders
- Precision Instrumentation and medical devices
- High-Frequency Motors and turbo-molecular pumps
- Aerospace Actuation Systems and auxiliary power units (APUs)
- Robotics joints and servo mechanisms
