S71913 ACD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71913 ACD/HCP4ADBC Bearing Product Overview & Core Advantages
The S71913 ACD/HCP4ADBC is a duplex pair of super-precision angular contact ball bearings designed for the most demanding high-performance applications. This matched set, arranged in a Back-to-Back (DB) configuration, delivers exceptional rotational accuracy and system rigidity. Its core advantages include the ability to handle combined loads (radial and axial) simultaneously, superior high-speed capability enabled by a phenolic cage and ceramic balls, and long service life due to preloaded moderate preload (Class C) and factory-applied grease. This bearing is the ideal solution for machine tool spindles and other applications requiring high rigidity and uncompromising precision.
S71913 ACD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Indicates a series of high-precision angular contact ball bearings. |
| 1913 | Specifies the bearing dimensions: 65mm bore, 90mm OD, 13mm single width. |
| ACD | Signifies a 25° contact angle and that the bearings are universally matchable (though this set is supplied as a specific pair). |
| HC | Denotes a hybrid ceramic construction, featuring ceramic balls for reduced friction and higher speed. |
| P4A | Specifies an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DB | Indicates the bearings are supplied as a duplex pair in a Back-to-Back arrangement. |
| C | Specifies the preload level, in this case, a moderate preload (Class C) for optimal rigidity. |
S71913 ACD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Back-to-Back (DB) duplex pair configuration creates a rigid bearing system that can withstand heavy combined loads and moment loads, ensuring exceptional stability for the spindle or shaft.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers operating temperatures and friction, enabling the high limiting speed of 31,000 rpm.
- Enhanced Precision and Longevity: The P4A tolerance class guarantees minimal runout and vibration for superior machining finish. The moderate preload eliminates internal clearance, providing precise rotational accuracy from startup.
- Sealed & Lubricated for Life: As a sealed unit with factory-applied grease, this bearing is protected from contamination and is lubricated for life under normal operating conditions within its specified temperature range.
S71913 ACD/HCP4ADBC Bearing Typical Application Areas
The S71913 ACD/HCP4ADBC is engineered for high-precision, high-speed machinery. Its primary applications include:
- Machine Tool Spindles: CNC milling centers, grinding spindles, and high-speed lathes.
- Precision Robotic Drives: High-accuracy joints and main arm drives.
- High-Frequency Motors & Spindles: Motors for PCB drilling and other micro-machining applications.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation components.
