S71912 ACD/HCP4AQBCC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71912 ACD/HCP4AQBCC
Basic Information
System of measurement
Metric
Weight
0.66 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.004mm to 0
Width
52 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
11115 lbf
Radial static load rating
13162 lbf
Limiting speed
36 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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S71912 ACD/HCP4AQBCC Bearing Product Overview & Core Advantages
The S71912 ACD/HCP4AQBCC is a precision quadruplex matched set of Double Row Angular Contact Ball Bearings. Engineered for the most demanding applications, this set is characterized by its P4A super-precision tolerance and ceramic ball construction. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with exceptional rigidity and accuracy. The back-to-back quadruplex (QBC) arrangement provides outstanding stability and moment load capacity, making it ideal for high-speed, high-precision spindles requiring maximum system rigidity.
S71912 ACD/HCP4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact bearings. |
| 1912 | Bore Diameter: 60 mm, Outside Diameter: 85 mm, Width: 52 mm. |
| ACD | Contact Angle of 25°. |
| HC | Hybrid Ceramic construction (Ceramic balls with steel rings). |
| P4A | Super Precision Tolerance Class (exceeds ABEC 7). |
| QBCC | Quadruplex Back-to-Back (QBC) matched set with Moderate Preload (Class C). |
S71912 ACD/HCP4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The double row design and quadruplex back-to-back arrangement create an extremely rigid bearing system capable of supporting high combined loads and significant moment loads.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a high limiting speed of 36,000 rpm. This setup minimizes friction and heat generation.
- Precision and Accuracy: The P4A tolerance class ensures minimal runout and precise rotational accuracy, which is critical for applications requiring high positional repeatability.
- Long Service Life & Reliability: The sealed design with pre-applied grease lubrication protects against contamination and provides reliable operation within a temperature range of -30°C to 110°C, reducing maintenance needs.
S71912 ACD/HCP4AQBCC Bearing Typical Application Areas
This bearing set is specifically designed for high-performance machinery where ultimate precision and speed are non-negotiable. Key applications include:
- High-Speed Machine Tool Spindles (e.g., CNC milling, grinding, and jig boring machines)
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Advanced Robotics and Automation (e.g., high-precision rotary joints)
- Aerospace and Defense instrumentation and control systems
