S71904 ACEGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71904 ACEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.035 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1053 lbf
Radial static load rating
504 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S71904 ACEGA/P4A Bearing Product Overview & Core Advantages
The S71904 ACEGA/P4A is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a single bearing from a universally matchable (SU) pair, it excels at handling combined loads, simultaneously supporting significant radial loads and thrust loads in one direction. Its P4A super-precision tolerance class and extra light preload (Class A) ensure smooth, quiet operation with minimal runout, making it ideal for high-speed spindles and other precision machinery where high rigidity and rotational accuracy are paramount.
S71904 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71904 ACEGA/P4A provides detailed technical specifications through its suffixes:
- S: Denotes a bearing with a super-precision tolerance class.
- 7: Identifies the bearing as an angular contact ball bearing.
- 1904: Specifies the size series; 19 for the series and 04 for a 20mm bore diameter.
- AC: Signifies a 25° contact angle, optimized for handling higher axial loads.
- EGA: Indicates the bearing is sealed and pre-lubricated with grease.
- P4A: Confirms the super-precision tolerance class, exceeding standard ABEC 7/ISO Class 4 specifications for enhanced running accuracy.
S71904 ACEGA/P4A Bearing Structural Features & Performance Benefits
The design of the S71904 ACEGA/P4A translates directly into superior performance:
- High Rigidity & Load Capacity: The 25° contact angle and robust construction provide high resistance to deformation under combined radial and axial loads.
- Super-Precision Performance: Manufactured to P4A tolerance class with an extra light preload, this bearing delivers exceptional running accuracy, low vibration, and minimal heat generation.
- Optimized High-Speed Operation: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 75,000 rpm.
- Maintenance-Free & Long Service Life: The integral seals and pre-filled grease lubrication protect against contamination and provide reliable operation across a wide temperature range (-30°C to 110°C), ensuring longevity with no required re-lubrication.
S71904 ACEGA/P4A Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors & Spindles: PCB drilling spindles and dental handpieces.
- Robotics: High-accuracy joints and actuators.
