71912 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71912 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71912 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered with ceramic balls and manufactured to P4A tolerance class, this bearing delivers superior speed capabilities and extended service life. Its 25° contact angle is optimized to handle significant combined loads (radial and axial) simultaneously, making it an ideal choice for high-rigidity, high-speed spindle systems. The pre-lubricated, open design with an extra light preload (Class A) ensures smooth, quiet operation right from installation.
Model Code Breakdown
- 71912: Basic series designation for a high-precision, small-bore angular contact bearing.
- AC: Angular Contact design.
- D: High-precision design with a 25° contact angle.
- GA: Universal Matchable (SU) bearing, supplied in a set of three for precise preload control when mounted together.
- HCP4A: P4A tolerance class, indicating extremely tight dimensional and running accuracy tolerances superior to standard ABEC 7/P4.
71912 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Performance: The combination of ceramic balls (silicon nitride) and a lightweight phenolic resin cage significantly reduces centrifugal forces, enabling a very high limiting speed of 33,000 rpm. This construction provides high rigidity and minimizes heat generation. The extra light preload eliminates internal clearance, ensuring precise shaft positioning and superior rotational accuracy under varying operational loads.
Exceptional Load Capacity & Longevity: The 25° contact angle provides an excellent balance between radial and axial load carrying capacity. The use of ceramic balls not only increases speed potential but also enhances bearing life by reducing wear and providing resistance to degradation in case of lubrication starvation. The chrome steel rings offer high strength and durability.
Precision & Thermal Stability: Manufactured to the stringent P4A tolerance class, this bearing guarantees minimal runout and vibration. The phenolic cage contributes to smooth operation and is well-suited for the specified temperature range of -30°C to 110°C.
71912 ACDGA/HCP4A Bearing Typical Application Areas
The 71912 ACDGA/HCP4A is primarily specified in high-performance machinery where supreme accuracy and speed are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing equipment.
- High-Frequency Motors: Spindles for aerospace and medical device manufacturing.
- Other Precision Rotary Equipment: Where minimal vibration and maximum rotational accuracy are critical.
