S71912 ACB/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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S71912 ACB/HCP4ADT Bearing Product Overview & Core Advantages
The S71912 ACB/HCP4ADT is a super-precision angular contact ball bearing engineered for the most demanding high-performance applications. Operating as a duplex tandem (DT) matched set, this bearing is designed to handle primarily axial loads in one direction with exceptional rigidity and accuracy. Its construction with ceramic balls and a P4A tolerance class ensures minimal heat generation, low vibration, and superior running accuracy, making it ideal for high-speed spindles and other precision machinery where uncompromising performance is critical.
Model Code Breakdown
- S7: Indicates a series of high-precision, high-speed angular contact ball bearings.
- 1912: Specifies the size series; 19 for the series and 12 for a 60mm bore.
- AC: Angular Contact design with a 25° contact angle.
- B: Denotes a specific internal design and preload level for high rigidity.
- HC: Signifies the use of Hybrid Ceramic balls (steel rings, ceramic balls).
- P4A: The tolerance class, equivalent to ABEC 7, defining very tight dimensional and running accuracy limits.
- DT: Duplex Tandem arrangement. Two bearings are mounted together to increase axial load capacity in one direction.
S71912 ACB/HCP4ADT Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds compared to all-steel bearings. This also enhances durability and service life.
High Rigidity & Load Capacity: The duplex tandem (DT) arrangement and specific internal preload (preload: available) provide maximum stiffness, making the bearing assembly exceptionally resistant to deflection under heavy axial loads.
Superior High-Speed Performance: The lightweight phenolic resin cage and hybrid ceramic design work in concert to achieve a very high limiting speed of 36,000 rpm, which is critical for machine tool spindles.
Sealed & Pre-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within the specified temperature range.
S71912 ACB/HCP4ADT Bearing Typical Application Areas
This bearing is specifically designed for high-precision, high-speed applications, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and high-speed machining centers)
- Precision Grinding Spindles
- High-frequency Electric Spindles
- Other advanced machinery requiring super-precision and high rigidity
