S71920 ACEGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71920 ACEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.78 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
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8348 lbf
Radial static load rating
6750 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S71920 ACEGA/P4A Bearing Product Overview & Core Advantages
The S71920 ACEGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 25° contact angle and extra light preload (Class A) make it ideally suited for handling combined radial and axial loads simultaneously, providing high rigidity and precise shaft positioning in demanding machinery.
S71920 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | High-precision bearing series |
| 1920 | Size series code (Bore: 100mm, OD: 140mm, Width: 20mm) |
| AC | 25° contact angle |
| E | Optimized internal design |
| GA | Light preload (Class A) |
| P4A | Super precision tolerance class |
S71920 ACEGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design with a 25° contact angle provides excellent resistance to combined loads, ensuring stable operation under both radial forces (dynamic rating: 8348 lbf) and axial thrust.
- Super-Precision Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore and outside diameter (±0.004mm), guaranteeing minimal runout and vibration for ultra-precise applications.
- High-Speed Capability: The lightweight phenolic resin cage and optimized internal geometry contribute to a high limiting speed of 16,250 rpm, reducing centrifugal forces and operational temperatures.
- Universal Matching & Preload: Designed as Universal Matchable (SU), these bearings can be supplied in sets (typically 3) and mounted in various preloaded configurations (back-to-back, face-to-face, or tandem) to achieve the required system rigidity and accuracy.
- Sealed & Lubricated for Life: The sealed design with factory-applied grease protects against contamination and provides reliable lubrication within the specified temperature range of -30°C to 110°C.
S71920 ACEGA/P4A Bearing Typical Application Areas
The S71920 ACEGA/P4A is engineered for high-performance applications where precision and speed are critical. Its primary uses include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, CNC indexing tables, and rotary actuators.
- High-Frequency Motors & Spindles: Electric motor spindles and high-speed drive systems.
- Medical & Laboratory Equipment: Centrifuges, dental handpieces, and advanced imaging systems.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
