S71920 ACE/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71920 ACE/HCP4ATBTA Bearing Product Overview & Core Advantages
The S71920 ACE/HCP4ATBTA is a metric precision angular contact ball bearing supplied as a matched triplex set in a back-to-back (TBT) arrangement. Engineered for the most demanding applications, its core advantages stem from its ability to handle combined loads (radial and axial) simultaneously with exceptional high rigidity and rotational accuracy. The combination of a P4A super-precision tolerance class, ceramic balls, and a phenolic cage enables superior high-speed performance and operational stability, making it ideal for high-precision, high-reliability spindles and machinery.
S71920 ACE/HCP4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| S7 | Bearing Series | Indicates a high-precision angular contact ball bearing series. |
| 1920 | Size Code | Denotes the bearing dimensions: 100mm bore, 140mm outside diameter, 60mm width. |
| ACE | Contact Angle & Internal Design | Specifies a 25° contact angle and optimized internal geometry for high axial load capacity. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls, which reduce friction, heat generation, and allow for higher speeds. |
| P4A | Tolerance Class | Denotes a super-precision tolerance grade (superior to ABEC 7), ensuring minimal runout and vibration. |
| TBT | Matched Arrangement | Identifies the bearing as part of a Triplex Back-to-Back set of three bearings, providing maximum moment rigidity. |
| A | Preload | Indicates an Extra Light (Class A) preload, optimized for high-speed operation with minimal friction. |
S71920 ACE/HCP4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity and Moment Load Capacity: The triplex back-to-back (TBT) arrangement of three bearings creates an extremely rigid support system, capable of withstanding significant moment loads and providing exceptional shaft positioning accuracy.
Superior High-Speed Performance: The hybrid ceramic balls are lighter and harder than steel, reducing centrifugal forces and wear. Combined with the lightweight, self-lubricating phenolic cage, this allows for the high limiting speed of 16,250 rpm with lower operating temperatures.
Precision and Long Service Life: The P4A tolerance class guarantees tight dimensional and running accuracy. The sealed design with factory-applied grease lubrication protects the precision internals from contamination, ensuring consistent performance and a long, maintenance-free operational life within the specified temperature range of -30°C to 110°C.
Optimized Load Ratings: With a 25° contact angle, this bearing is engineered to support high combined radial and axial loads, as evidenced by its dynamic (17,842 lbf) and static (20,250 lbf) load ratings.
S71920 ACE/HCP4ATBTA Bearing Typical Application Areas
The S71920 ACE/HCP4ATBTA is designed for high-performance applications where precision, speed, and rigidity are paramount. Typical industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for CNC machinery and robotics.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
