S71909 ACE/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71909 ACE/HCP4ADT
Basic Information
System of measurement
Metric
Weight
0.23 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 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
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2902 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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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S71909 ACE/HCP4ADT Bearing Product Overview & Core Advantages
The S71909 ACE/HCP4ADT is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. Operating under a P4A tolerance class, it delivers exceptional rotational accuracy. Its duplex tandem (DT) arrangement and 25° contact angle are engineered to handle significant axial loads in one direction, making it ideal for precise spindles. The combination of a phenolic cage and ceramic balls contributes to lower friction, higher limiting speeds, and extended service life.
S71909 ACE/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
The model number S71909 ACE/HCP4ADT provides detailed technical specifications:
- S7: High-precision bearing series
- 1909: Standard size designation (45mm bore, 68mm OD, 24mm width)
- ACE: Specific internal design and clearance
- HC: Hybrid Ceramic (Steel rings with Ceramic balls)
- P4A: Ultra-precision tolerance class, tighter than ABEC 7
- ADT: Arrangement: Duplex Tandem (Two bearings mounted in tandem for increased axial load capacity)
S71909 ACE/HCP4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement of two preloaded bearings creates an exceptionally rigid system capable of supporting high axial loads. The 25° contact angle is optimized for this load direction.
- Superior High-Speed Performance: The lightweight phenolic resin cage and low-density silicon nitride (Si3N4) ceramic balls reduce centrifugal forces, enabling a high limiting speed of 41,000 rpm.
- Enhanced Durability and Temperature Stability: Ceramic balls are harder, lighter, and offer superior resistance to wear and thermal deformation compared to steel, maintaining precision under high-speed operation.
- Pre-Lubricated & Sealed: Comes pre-lubricated with grease and is sealed, protecting against contamination and providing maintenance-free operation within the specified temperature range of -30°C to 110°C.
S71909 ACE/HCP4ADT Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications requiring maximum speed and precision, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and dental handpieces.
- High-Frequency Motors: Spindles for routers and other high-RPM machinery.
- Aerospace & Defense Systems: Gyroscopes and other critical navigation instruments.
