S71918 ACD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71918 ACD/HCP4ADBA Bearing Product Overview & Core Advantages
The S71918 ACD/HCP4ADBA is a high-precision, metric double row angular contact ball bearing designed for demanding applications requiring exceptional rigidity and speed. Its duplex back-to-back (DB) arrangement and P4A super-precision tolerance class enable it to handle combined radial and axial loads simultaneously with high running accuracy. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it an ideal choice for high-reliability, high-performance systems.
Model Code Breakdown
- S71918: Basic model number for a 90mm bore, 125mm OD double row angular contact ball bearing.
- ACD: Indicates a specific internal design and contact angle (25°).
- HC: Denotes a hybrid ceramic bearing construction (steel rings with ceramic balls).
- P4A: Specifies a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior running accuracy.
- DB: Identifies the bearing set as a Duplex Back-to-Back matched pair, providing high rigidity against moment loads.
- A: Signifies an Extra Light preload within the matched set for optimal stiffness and minimal deflection under load.
S71918 ACD/HCP4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The double row design and duplex back-to-back (DB) arrangement provide significantly increased rigidity, enabling the bearing to withstand heavy combined loads and moment loads effectively.
High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a very high limiting speed of 15,000 rpm, reducing heat generation and power loss.
Precision and Longevity: Manufactured to P4A tolerance class for exceptional dimensional accuracy and smooth operation. The hybrid ceramic construction offers superior wear resistance and longer service life, especially in challenging environments.
Sealed and Pre-Lubricated: The bearing is sealed and pre-lubricated with grease, offering protection from contaminants and providing maintenance-free operation within its specified temperature range.
S71918 ACD/HCP4ADBA Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where extreme accuracy, high speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Motors and Turbines
- Aerospace and Defense Positioning Systems
