71930 ACDGC/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71930 ACDGC/HCP4A
Basic Information
System of measurement
Metric
Weight
2.08 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
150 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
28 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
24300 lbf
Radial static load rating
28125 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71930 ACDGC/HCP4A Bearing Product Overview & Core Advantages
The 71930 ACDGC/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications demanding exceptional speed and rigidity. Positioned in the P4A super-precision tolerance class, it delivers superior running accuracy and dimensional stability. Its defining characteristic is the 25° contact angle and ceramic ball construction, which collectively enable superior high-speed performance and extended service life by reducing centrifugal forces and operating temperatures. This bearing is pre-lubricated and features a Universal Matchable (SU) design, allowing it to be mounted in sets (typically in a 3-bearing arrangement) to withstand combined radial and axial loads efficiently.
Model Code Breakdown
The model number 71930 ACDGC/HCP4A provides detailed technical specifications through its suffixes:
- 71930: Basic series designation for a high-precision angular contact ball bearing.
- AC: Signifies Angular Contact design with a 25° contact angle.
- D: Indicates a High Rigidity internal design.
- GC: Represents a specific internal clearance and preload grade, corresponding to a Moderate Preload (Class C).
- HCP4A: A combined suffix where HC denotes a Phenolic Resin Cage and P4A specifies the super-precision tolerance class, exceeding ABEC 7 standards.
71930 ACDGC/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a lightweight phenolic resin cage and low-density ceramic (Si3N4) balls significantly reduces centrifugal forces, enabling a high limiting speed of 11,000 rpm. This design also minimizes heat generation.
- High Rigidity and Load Capacity: The 25° contact angle and Moderate Preload (Class C) provide high axial and radial stiffness, making it ideal for applications requiring precise shaft positioning under combined loads.
- Super-Precision Performance: Manufactured to P4A tolerance class with tight bore, outer diameter, and width tolerances, this bearing ensures minimal runout and vibration for ultra-smooth operation.
- Universal Matching: As an Universal Matchable (SU) bearing, it can be universally paired with other SU bearings in any combination (e.g., DB, DF, DT arrangements) to create a pre-loaded set, simplifying installation and optimizing system performance.
71930 ACDGC/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and reliability are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other precision instrumentation.
