707AC
Miniature Angular Contact Ball Bearings
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707AC Bearing Product Overview & Core Advantages
The 707AC is a high-performance angular contact ball bearing engineered for applications demanding exceptional precision and speed. As a precision bearing, it is designed to simultaneously accommodate combined loads—significant radial loads and high unidirectional axial loads. Its compact design, with a bore of 7 mm and outside diameter of 19 mm, offers a space-saving solution without compromising performance. Available in both Sealed and Open variants, and with options for Ceramic balls, it is built for high rigidity and reliable operation in demanding environments.
707AC Bearing Model Code Explained, Specifications & Naming Convention
The 707AC model number and its common suffixes indicate specific technical features:
- 707: Standard designation for this bearing series, defining its core bearing dimensions.
- A: Denotes a 25° contact angle, optimized for supporting high axial loads.
- C: Indicates the availability of Ceramic (Silicon Nitride) ball material for enhanced speed and longevity.
- Seal Type: The bearing can be supplied as Open or Sealed, with seals retaining lubrication and excluding contaminants.
- Preload: The bearing is available with Preload for increased system stiffness and precise rotational accuracy.
- SU: Signifies Universal Matchable arrangement, allowing two bearings to be paired for optimal performance.
707AC Bearing Structural Features & Performance Benefits
The 707AC's design delivers distinct performance advantages critical for advanced machinery:
- High-Speed Performance: Engineered as a true high-speed bearing, it achieves remarkable limiting speeds of up to 115,000 r/min with oil lubrication and 70,000 r/min with grease. The use of lightweight Nylon or Phenolic cages minimizes centrifugal forces, which is crucial for stable operation at extreme velocities.
- Superior Rigidity and Load Capacity: The 25° contact angle and robust internal geometry provide high axial and radial stiffness, enabling the bearing to handle combined loads effectively and maintain precise shaft positioning.
- Precision & Longevity: Manufactured to ABEC P5/P4 precision classes, it ensures minimal runout and vibration. The optional Ceramic balls offer reduced friction, lower operating temperatures, and dramatically extended service life, especially in high-speed applications.
- Versatile Lubrication & Sealing: Being Lubricated, it is ready for immediate use. The sealed versions provide a maintenance-free solution by protecting the bearing from contamination and retaining the lubricant.
707AC Bearing Typical Application Areas
The 707AC is ideally suited for high-speed and high-precision applications across various industries, including:
- High-Speed Spindles for CNC machining centers and PCB drilling machines
- Turbochargers and auxiliary systems in the automotive and aerospace sectors
- Precision Instrumentation and medical device components
- High-Frequency Motors and dental handpieces
