71920 ACD/HCP4ALDGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 ACD/HCP4ALDGA
Basic Information
System of measurement
Metric
Weight
1.34 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
40 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
20768 lbf
Radial static load rating
28125 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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 ACD/HCP4ALDGA Bearing Product Overview & Core Advantages
The 71920 ACD/HCP4ALDGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As part of a universally matchable (SU) set, it is engineered to accommodate combined loads—significant radial and axial loads in one direction. Its construction with a ceramic ball and phenolic cage contributes to lower friction, higher limiting speeds, and superior performance in demanding environments. This bearing is pre-lubricated and classified under the stringent P4A tolerance class, making it ideal for high-precision, high-reliability machinery.
71920 ACD/HCP4ALDGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 ACD/HCP4ALDGA can be broken down as follows to reveal its technical specifications:
- 71920: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a high-precision design with specific internal optimizations.
- HC: Indicates the use of Hybrid Ceramic balls (Silicon Nitride).
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards.
- A: Specifies an Extra Light (Class A) preload for minimal friction and high-speed operation.
- LDGA: Indicates the bearing is Lubricated and part of a Universal Matchable (SU) set.
71920 ACD/HCP4ALDGA Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic balls and a lightweight phenolic resin cage reduces centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm.
- Exceptional Rigidity and Load Capacity: The angular contact design with a 25° contact angle provides high rigidity and is optimized to handle significant combined radial and axial loads, as evidenced by its dynamic (20,768 lbf) and static (28,125 lbf) load ratings.
- Ultra-Precision Operation: Manufactured to P4A tolerance class with tight bore and OD tolerances, this bearing ensures minimal runout and vibration for superior rotational accuracy.
- Universal Matchability (SU): Bearings are supplied as a universally matchable set, allowing for flexible mounting in tandem or back-to-back arrangements to optimize stiffness and load distribution in the application.
- Pre-Lubricated for Immediate Use: The bearing comes pre-lubricated, simplifying installation and providing immediate protection upon startup.
71920 ACD/HCP4ALDGA Bearing Typical Application Areas
This high-performance bearing is ideally suited for:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Medical Equipment (Dental handpieces, imaging devices)
- Aerospace & Defense Systems (Gyroscopes, radar equipment)
- High-Frequency Motors and Spindles
- Semiconductor Manufacturing Equipment
