S71908 ACB/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71908 ACB/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.24 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1843 lbf
Radial static load rating
1755 lbf
Limiting speed
41 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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S71908 ACB/HCP4ADGA Bearing Product Overview & Core Advantages
The S71908 ACB/HCP4ADGA is a super-precision double row angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. Its metric design combines two rows of ceramic balls with a 25° contact angle, enabling it to support significant combined loads (radial and bidirectional axial loads) simultaneously. Manufactured to an ultra-precise P4A tolerance class, this bearing delivers exceptional running accuracy, operational stability, and long service life, making it ideal for high-reliability machinery.
Model Code Breakdown
The model number S71908 ACB/HCP4ADGA provides detailed technical specifications:
- S7: High-precision bearing series with optimized internal design for superior performance.
- 1908: Standard size designation (40mm bore, 62mm OD, 24mm width).
- ACB: Angular Contact Bearing with a 25° contact angle.
- HCP4A: Denotes the tolerance class P4A (higher than ABEC 7/ISO P4) and specific internal clearance/geometry.
- DGA: Indicates the bearing is universally matchable (SU), allowing any two bearings to be mounted together in a back-to-back, face-to-face, or tandem arrangement without performance loss.
S71908 ACB/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design provides superior radial and axial rigidity compared to single row bearings. This robust construction allows it to handle heavy combined loads and moment loads effectively, ensuring precise shaft positioning.
- Exceptional High-Speed Performance: The combination of lightweight phenolic resin cage and low-density ceramic (Si3N4) balls significantly reduces centrifugal forces, enabling very high limiting speeds (41,000 rpm). The pre-lubrication with grease ensures immediate and reliable operation.
- Precision & Longevity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. The sealed construction protects the precision-ground chrome steel rings and ceramic balls from contamination, enhancing reliability and service life in critical applications.
- Universal Matchability: As a Universal Matchable (SU) bearing, it offers unparalleled flexibility in mounting configurations, simplifying procurement and inventory management for preloaded bearing sets.
S71908 ACB/HCP4ADGA Bearing Typical Application Areas
This super-precision angular contact ball bearing is specifically designed for high-performance equipment, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arm actuators.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and imaging scanner rotors.
