718/7C
Miniature Angular Contact Ball Bearings
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718/7C Bearing Product Overview & Core Advantages
The 718/7C is a miniature angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to accommodate combined loads (radial and axial loads simultaneously), this bearing is ideal for compact spaces where performance cannot be compromised. Its availability in various configurations, including sealed and open types, along with options for ceramic balls and high-grade cage materials, makes it a versatile solution for demanding high-speed environments.
718/7C Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 718 | Series designation for miniature angular contact ball bearings. |
| 7 | Bore diameter code (7 mm). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
Common Optional Suffixes (Not part of base 718/7C code):
- Sealed/Open: Available with seals for contamination protection or open for high-speed lubrication regimes.
- P5 / P4: Denotes ABEC-5 and ABEC-7 (P4) precision classes for superior running accuracy.
- Universal Matchable (SU): Bearings can be mounted in pairs (back-to-back, face-to-face, or tandem) to enhance system rigidity and load capacity.
- Preload: Available with preload for reduced axial play and increased stiffness.
718/7C Bearing Structural Features & Performance Benefits
The performance of the 718/7C is derived from its precise engineering:
- High Rigidity and Precision: Manufactured to ABEC-5 (P5) and ABEC-7 (P4) tolerance classes, this bearing ensures minimal runout and vibration, which is critical for high-precision spindles and instruments.
- Superior Load Capacity: The 15° contact angle is optimally designed to handle significant combined loads, providing robust support in applications with simultaneous radial and axial forces.
- Optimized High-Speed Performance: The availability of lightweight nylon or phenolic cages reduces centrifugal forces, while the option for ceramic balls further minimizes friction and heat generation, enabling higher limiting speeds.
- Versatile Configuration & Longevity: The Universal Matchable (SU) designation allows for flexible mounting arrangements to build a stiffer bearing system. Sealed versions come pre-lubricated for long-term, maintenance-free operation in contaminated environments.
718/7C Bearing Typical Application Areas
The 718/7C miniature angular contact ball bearing is indispensable in applications where space is limited and performance is paramount. Key sectors include:
- High-Speed Spindles: For PCB drilling, dental handpieces, and small precision machine tools.
- Precision Instrumentation: Used in optical encoders, gyroscopes, and medical diagnostic equipment.
- Robotics and Automation: Ideal for joints and drives in small-scale robotic arms and precision actuators.
- Aerospace and Defense: Deployed in guidance systems, instrumentation, and other critical avionics components.
