S71920 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71920 ACD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
1.36 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
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
10 X 1000 rpm
Lubrication
Grease
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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S71920 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The S71920 ACD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a double row angular contact ball bearing, it can simultaneously support substantial combined loads (radial and axial loads from both directions) in a compact design. Its construction with ceramic balls and a P4A super-precision tolerance class ensures superior performance in high-speed and high-rigidity scenarios, making it an ideal solution for advanced machinery.
S71920 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Basic bearing designation, indicating a double row angular contact ball bearing with a 100 mm bore. |
| ACD | Contact angle of 25° and a universal matchable (SU) design for simplified mounting in pairs. |
| HC | Hybrid Ceramic construction, featuring ceramic balls for reduced friction and higher speed capability. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
| ADGA | Specific internal design and preload designation (Extra light / Class A). |
S71920 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides exceptional stiffness, enabling stable support under heavy combined loads. With a 25° contact angle, it offers excellent axial load capacity in both directions.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a high limiting speed of 10,000 rpm, minimizing heat generation and power loss.
- Precision & Longevity: Manufactured to a P4A tolerance class with tight bearing dimensions and bore/OD tolerances, this bearing ensures minimal runout and vibration for precise operation. The sealed construction with pre-applied grease lubrication protects against contamination and provides reliable operation within a -30°C to 110°C temperature range.
- Simplified Mounting: The Universal Matchable (SU) designation means bearings are pre-ground to be mounted in pairs (back-to-back or face-to-face) without selective assembly, simplifying installation and ensuring optimal preload.
S71920 ACD/HCP4ADGA Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring utmost accuracy and rigidity.
- High-Frequency Spindles: In PCB drilling and precision engraving machines.
- Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: Including gyroscopes, radar systems, and other precision instrumentation.
