71909 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4A
Seal type
Open
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
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
2025 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
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
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71909 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71909 ACDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features an Extra Light (Class A) preload and a 25° contact angle, optimized to handle combined radial and axial loads simultaneously. Its construction with ceramic balls and a phenolic cage enables superior high-speed operation up to 41,000 rpm, while the P4A tolerance class ensures extreme dimensional and running accuracy for applications where high rigidity and minimal runout are critical.
71909 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design, optimized for combined loads. |
| DGA | Specific internal design and preload specification (Extra Light / Class A). |
| HCP4A | Indicates the bearing is Universal Matchable (SU) and manufactured to P4A tolerance class for ultra-precision. |
71909 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage significantly lowers friction and inertial mass, enabling the high limiting speed of 41,000 rpm.
- Precision & Rigidity: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width. The Class A preload eliminates internal clearance, providing high system stiffness and precise rotational accuracy.
- Superior Load Capacity: The 25° contact angle is optimally designed to support significant combined radial and axial loads, with a dynamic load rating of 2790 lbf and a static load rating of 2025 lbf.
- Universal Matching: Designated as Universal Matchable (SU), this bearing can be mounted in sets (back-to-back, face-to-face, or tandem) with other bearings of the same type to share loads and increase overall system rigidity without selective matching.
71909 ACDGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery and systems, including:
- Machine Tool Spindles (high-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Aerospace Actuators and Control Systems
- Medical and Laboratory Centrifuges
