S71918 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Main Dimensions
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S71918 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S71918 ACD/P4ADBA is a super-precision double row angular contact ball bearing designed for the most demanding applications. Its P4A tolerance class and duplex back-to-back (DB) arrangement provide exceptional running accuracy, high system rigidity, and superior rotational stability. This bearing is engineered to accommodate combined loads (radial and bidirectional axial loads) simultaneously, making it an ideal choice for high-speed spindles and other precision machinery where uncompromising performance and reliability are paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71918 | Basic bearing designation, indicating a double row angular contact ball bearing with a 90mm bore. |
| ACD | Indicates a 25° contact angle and a Duplex Back-to-Back (DB) pre-set arrangement. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding normal P4 standards, for superior running accuracy. |
| DB | Confirms the Duplex Back-to-Back matched set configuration, which provides high moment stiffness. |
| A | Specifies an Extra Light preload (Class A), optimized for high-speed operation and minimal friction. |
S71918 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) arrangement of the two bearing rows creates a large effective spread, significantly increasing the moment load capacity and overall system rigidity. This is critical for applications requiring high positional accuracy.
Superior Load Capacity: With a 25° contact angle and a double row design, this bearing is engineered to handle significant combined radial and axial loads from both directions, eliminating the need for complex bearing arrangements.
Optimized High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low centrifugal forces, contributing to a high limiting speed of 15,000 rpm. The extra light preload further minimizes heat generation at high speeds.
Sealed and Pre-Lubricated: As a sealed bearing, it is protected from contamination and comes pre-lubricated with grease, ensuring long service life and reducing maintenance requirements in critical applications.
S71918 ACD/P4ADBA Bearing Typical Application Areas
The S71918 ACD/P4ADBA is ideally suited for high-performance machinery where precision and speed are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for integrally mounted motor applications.
- Robotics: High-accuracy rotary joints and arm actuators.
- Medical Equipment: Dental handpieces and surgical drill spindles.
