71920 ACE/HCP4ALDGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71920 ACE/HCP4ALDGA
Basic Information
System of measurement
Metric
Weight
1.3 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
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
13612 lbf
Radial static load rating
13500 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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In Stock
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71920 ACE/HCP4ALDGA Bearing Product Overview & Core Advantages
The 71920 ACE/HCP4ALDGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. Engineered to a P4A tolerance class, this bearing excels in high-speed and high-rigidity scenarios. Its universal matchable (SU) design allows for flexible mounting in pairs to handle combined loads, including significant radial and axial forces. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it an ideal solution for the most demanding industrial applications.
71920 ACE/HCP4ALDGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71920 ACE/HCP4ALDGA provides detailed technical specifications through its suffixes:
- 71920: Basic bearing series and size designation (100mm bore, 140mm OD, 40mm width).
- ACE: Designates specific internal design features, including the 25° contact angle and extra light preload (Class A).
- HC: Indicates the use of Hybrid Ceramic balls for enhanced speed and durability.
- P4A: Specifies the ultra-precision tolerance class, ensuring minimal runout and superior rotational accuracy.
- LDGA: Denotes a Universal Matchable (SU) bearing, designed to be mounted in pairs (set of 2) in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement.
71920 ACE/HCP4ALDGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and universal matching capability enable the bearing to handle significant combined radial and axial loads simultaneously, providing stable and rigid support for spindles and shafts.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a very high limiting speed of 15,000 rpm, minimizing heat generation and power loss.
- Precision & Accuracy: Manufactured to P4A tolerance class with a precisely controlled 25° contact angle, this bearing ensures minimal vibration and exceptional running accuracy, which is critical for precision machinery.
- Optimized for Matched Sets: As a Universal Matchable (SU) bearing supplied in a set of 2, it is pre-configured for immediate installation in preload-adjusted pairs, simplifying assembly and guaranteeing optimal performance.
71920 ACE/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 and surgical drill spindles.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Where high RPM and accuracy are paramount.
