718/8C
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
718/8C Bearing Product Overview & Core Advantages
The 718/8C is a high-precision miniature angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. Featuring a 15° contact angle, this bearing is optimized to support combined loads (simultaneous radial and axial loads) with high reliability. Its compact design, with an 8 mm bore, 16 mm outside diameter, and 5 mm width, makes it ideal for space-constrained, high-speed applications. Available in both Sealed and Open variants, and with options for preload and Universal Matchable (SU) arrangements, it offers design flexibility for achieving optimal system performance and high rigidity.
718/8C Bearing Model Code Explained, Specifications & Naming Convention
- 718: Series designation for miniature angular contact ball bearings.
- 8: Nominal bore diameter in millimeters (8 mm).
- C: Denotes a 15° contact angle, which is optimized for high-speed operation and provides a good balance between radial and axial load capacity.
Common optional suffixes and their technical meanings include:
- P5 / P4: ABEC rating indicating high precision levels (P5/ABEC-5 or P4/ABEC-16).
- -2RS or similar: Indicates sealed construction with contact seals for enhanced contamination protection.
- Cage Material: Options include Nylon for quiet operation and high speeds, or Phenolic for high-temperature applications.
- Ball Material: Standard Steel or Ceramic (Si3N4) for hybrid ceramic bearings offering higher speed capability and electrical insulation.
718/8C Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to ABEC P5/P4 precision classes, the 718/8C ensures minimal runout and vibration. The angular contact design and availability of preload enable a stiff bearing setup that minimizes deflection under load.
- Superior Load Capacity: The 15° contact angle is engineered to handle significant combined loads, making it suitable for applications with complex loading conditions.
- Optimized High-Speed Performance: The use of lightweight Nylon or Phenolic cages reduces centrifugal forces, while the option for Ceramic balls further enhances high-speed capability and reduces friction.
- Versatile Configuration & Longevity: The Universal Matchable (SU) feature allows bearings to be mounted in pairs (back-to-back, face-to-face, or tandem) without selective matching. Sealed versions are lubricated for life, providing long-term, maintenance-free operation.
718/8C Bearing Typical Application Areas
- High-Speed Spindles in CNC machining centers, PCB drilling machines, and dental handpieces.
- Precision Instruments including optical encoders, gyroscopes, and measuring devices.
- Office Automation Equipment such as high-performance scanner and printer rollers.
- Robotics and small precision gearboxes requiring compact, high-rigidity support.
