S71912 ACD/P4AQBCB
Sealed Super Precision Angular Contact Ball Bearings
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S71912 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The S71912 ACD/P4AQBCB is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class metric bearing features a back-to-back (QBC) matched arrangement of four bearings, enabling it to withstand combined radial and axial loads from multiple directions simultaneously. Its compact design, sealed construction, and light preload (Class B) make it ideal for high-speed spindles and other precision machinery where high rigidity and operational reliability are critical.
S71912 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | High-precision angular contact ball bearing series |
| 1912 | Bore diameter: 60 mm, Outside diameter: 85 mm, Width: 52 mm |
| ACD | 25° contact angle design |
| P4A | High precision tolerance class (superior to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
| B | Light preload classification |
S71912 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system that minimizes deflection under heavy combined loads, ensuring precise shaft positioning and stability.
Optimized Load Capacity: With a 25° contact angle and four-bearing configuration, this unit delivers superior performance handling both significant radial loads (11,115 lbf dynamic) and axial loads in both directions simultaneously.
High-Speed Capability: The phenolic cage material provides excellent strength-to-weight ratio, contributing to the bearing's ability to achieve limiting speeds of 36,000 rpm while maintaining stability.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for high-precision applications.
Sealed & Lubricated Design: The sealed construction with factory-applied grease lubrication provides contamination protection and long-term performance across a wide temperature range (-30°C to 110°C).
S71912 ACD/P4AQBCB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes
- Precision Robotics: Robotic arm joints and precision positioning systems
- Medical Equipment: High-speed dental handpieces, surgical tools, and imaging systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- High-Speed Automation: Pick-and-place systems, semiconductor manufacturing equipment
