71920 ACDGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 ACDGA/HCP4AL
Basic Information
System of measurement
Metric
Weight
0.67 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12870 lbf
Radial static load rating
14175 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71920 ACDGA/HCP4AL Bearing Product Overview & Core Advantages
The 71920 ACDGA/HCP4AL is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features a 25° contact angle and is manufactured to P4A super-precision tolerance class, ensuring minimal runout and superior rotational accuracy. Its core advantages include the ability to handle combined radial and axial loads simultaneously, excellent high-speed capability facilitated by a phenolic cage and ceramic balls, and outstanding operational reliability in a wide temperature range from -30°C to 110°C.
71920 ACDGA/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 ACDGA/HCP4AL provides detailed technical specifications through its suffixes:
- 71920: Basic bearing series and size designation (100mm bore, 140mm OD, 20mm width).
- AC: Angular Contact design.
- D: Specific internal design and contact angle of 25°.
- GA: Indicates a specific internal clearance and preload level (Extra light / Class A).
- HCP4A: Denotes the P4A tolerance class for ultra-high precision.
- L: Signifies the bearing is Lubricated from the factory.
71920 ACDGA/HCP4AL Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance standards with a bore and outside diameter tolerance of -0.004mm to 0, this bearing provides exceptional dimensional stability and running accuracy for high-precision spindles.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic balls significantly reduces centrifugal forces, enabling a high limiting speed of 15,000 rpm.
- Enhanced Load Capacity: The 25° contact angle and robust construction provide a high dynamic load rating of 12,870 lbf and static load rating of 14,175 lbf, making it suitable for significant combined loads.
- Universal Matching: Designated as Universal Matchable (SU), this bearing can be universally paired with another identical bearing in a matched set to form a rigid, pre-loaded arrangement, optimizing system performance.
- Wide Operating Range: The standard lubrication and material selection allow for reliable operation across a broad temperature range.
71920 ACDGA/HCP4AL Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Equipment
- Aerospace Control Systems
- Medical and Dental Handpiece Drives
