S71911 CDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71911 CDGA/P4A Bearing Product Overview & Core Advantages
The S71911 CDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy, rigidity, and speed. As a single bearing with a 15° contact angle and Extra light preload (Class A), it is engineered to handle combined loads—significant radial loads alongside axial loads in one direction. Its P4A tolerance class and phenolic resin cage ensure exceptional running accuracy and stability, making it ideal for high-speed spindles and other precision machinery where minimal runout and high reliability are critical.
S71911 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Super-precision bearing |
| 7 | Angular contact ball bearing |
| 1911 | Bore diameter: 55 mm, Outside diameter: 80 mm, Width: 13 mm |
| CD | Contact angle of 15° |
| GA | Universal Matchable (SU) bearing, supplied in a set of 3 for preload adjustment |
| P4A | High-precision tolerance class, stricter than ABEC 7 |
S71911 CDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: Manufactured to P4A tolerance standards with extremely tight dimensional tolerances on the bore, outside diameter, and width. This ensures precise shaft positioning and minimal vibration, which is critical for high-speed applications.
- Optimized for Combined Loads: The 15° contact angle provides an excellent balance, enabling the bearing to support substantial radial loads while efficiently accommodating axial loads in one direction.
- Superior High-Speed Performance: The lightweight phenolic resin cage offers high strength and excellent dimensional stability at high rotational speeds, contributing to a limiting speed of 34,000 rpm. The standard grease lubrication is optimized for this performance envelope.
- Universal Matching Design: The GA suffix indicates that the bearings are universally matchable. Supplied in sets of three, they can be arranged in various duplex configurations (e.g., back-to-back, face-to-face) to achieve specific preload and stiffness requirements without selective mounting.
S71911 CDGA/P4A Bearing Typical Application Areas
The S71911 CDGA/P4A is specified for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motors.
- Robotics: High-accuracy rotary joints and arm actuators.
- Medical Equipment: Dental handpieces and surgical drill spindles.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation instruments.
