S71918 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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S71918 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The S71918 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This sealed bearing features a universal matchable (SU) design, allowing two bearings to be mounted in a tandem, back-to-back, or face-to-face arrangement to optimize performance for specific load conditions. Its construction with a phenolic cage and ceramic balls enables superior high-speed performance and reduced rotational mass. The bearing is preloaded to Extra Light (Class A) and manufactured to P4A tolerance class, ensuring high running accuracy, high rigidity, and the ability to handle combined loads efficiently.
S71918 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Stainless Steel Bearing (Note: Specification indicates Chrome Steel ring material) |
| 7 | Angular Contact Ball Bearing |
| 1918 | Bore Diameter: 90 mm, Outside Diameter: 125 mm, Width: 18 mm |
| AC | 25° Contact Angle |
| DGA | Universal Matchable (SU) bearing, two bearings in a set |
| HC | Hybrid Ceramic (Ceramic balls with steel rings) |
| P4A | High Precision Tolerance Class (exceeds ABEC 7) |
S71918 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of ceramic balls significantly reduces weight and inertia, lowers operating temperature, and provides excellent resistance to wear and electrical erosion. This is critical for achieving high limiting speeds (up to 15,000 rpm).
Phenolic Resin Cage: The phenolic cage offers high strength-to-weight ratio, excellent dimensional stability, and smooth operation at high speeds, contributing to the bearing's overall high-speed capability and low vibration.
25° Contact Angle & Preload: The 25° contact angle is optimized for handling significant axial loads in one direction while also supporting radial loads. The Extra Light (Class A) preload eliminates internal clearance, resulting in greater stiffness and precise shaft positioning, which is essential for applications with minimal deflection requirements.
Sealed & Grease Lubricated: The integral seals protect against contamination and retain the grease lubrication, making the bearing ready for use and providing long-term, maintenance-free operation within its specified temperature range (-30°C to 110°C).
S71918 ACDGA/HCP4A Bearing Typical Application Areas
The S71918 ACDGA/HCP4A is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In robot arm joints and gears requiring high accuracy and responsiveness.
- High-Frequency Motors and Spindles: Used in CNC routers, PCB drilling machines, and dental handpieces.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other critical control mechanisms.
- Medical Equipment: For imaging devices (CT/MRI scanners) and high-speed surgical tools.
