S71920 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71920 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.68 kg
Tolerance class
P4A
Seal type
Sealed
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
16.25 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 438.36
/ each
In Stock
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S71920 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The S71920 ACDGA/HCP4A is a super-precision angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. As a single bearing with a 25° contact angle and P4A tolerance class, it delivers exceptional running accuracy. Its core advantages include the ability to handle combined radial and axial loads simultaneously, superior high-speed performance enabled by a phenolic cage and ceramic balls, and outstanding operational stability. This bearing is designed for machine tool spindles and other precision equipment where maximum rotational accuracy and reliability are critical.
S71920 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71920 ACDGA/HCP4A provides a detailed technical specification:
- S7: Indicates a series of high-precision, high-speed bearings.
- 1920: Denotes the size series; 19 for the series and 20 for the 100 mm bore.
- AC: Angular Contact design.
- D: Signifies a duplex (preloaded) bearing arrangement.
- GA: Specifies the preload level; Extra Light (Class A).
- HCP4A: A combination suffix where HC indicates a hybrid ceramic design (steel rings, ceramic balls), and P4A defines an extremely high tolerance class superior to ABEC 7.
S71920 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4A tolerance class and universal matchable (SU) design ensure minimal runout and vibration, providing a stable and rigid platform for spindles. The extra light preload (GA) minimizes deflection under operational loads.
- Superior High-Speed Capability: The combination of a lightweight phenolic cage and ceramic balls (Hybrid) significantly reduces centrifugal forces, lowers operating temperature, and allows for a very high limiting speed of 16,250 rpm.
- Enhanced Load Capacity: With a 25° contact angle, the bearing is optimized to support significant combined loads. Its dynamic and static load ratings of 12,870 lbf and 14,175 lbf, respectively, ensure long service life under demanding conditions.
- Reduced Maintenance & Long Life: The sealed design retains factory-applied grease lubrication and protects against contaminants. The ceramic balls are electrically resistant and have a lower coefficient of thermal expansion, contributing to consistent performance across the temperature range of -30°C to 110°C.
S71920 ACDGA/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications requiring utmost precision and speed, including:
- Machine Tool Spindles (CNC machining centers, grinding spindles)
- High-Frequency Motors
- Precision Instrumentation
- Aerospace & Defense Systems
- Medical Equipment (e.g., high-speed dental handpieces)
