71917 ACD/PA9ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 ACD/PA9ADBC
Basic Information
System of measurement
Metric
Weight
1.06 kg
Tolerance class
PA9A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
85 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
16088 lbf
Radial static load rating
20588 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71917 ACD/PA9ADBC Bearing Product Overview & Core Advantages
The 71917 ACD/PA9ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate / Class C specifications, providing superior system stability and resistance to complex combined loads. Manufactured to an ultra-precise PA9A tolerance class, it is the ideal solution for high-precision, high-rigidity spindles and machinery where uncompromising performance is critical.
71917 ACD/PA9ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71917 ACD/PA9ADBC is decoded as follows:
- 71917: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two bearings supplied as a set).
- /PA9A: Specifies the tolerance class (PA9A), denoting extremely tight dimensional and running accuracy tolerances.
- DB: Denotes the Duplex Back-to-Back mounting arrangement.
- C: Indicates the Moderate / Class C preload.
71917 ACD/PA9ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The back-to-back (DB) duplex arrangement and moderate preload create a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational accuracy.
- Superior Load Capacity: Engineered to handle significant combined radial and axial loads simultaneously, thanks to the 25° contact angle and optimized internal geometry.
- Precision & High-Speed Capability: The PA9A tolerance class ensures minimal runout and vibration. The lightweight phenolic cage and precision-ground chrome steel components contribute to smooth operation and a high limiting speed of 28,000 rpm.
- Optimized for Performance: The bearing is supplied lubricated and ready for installation, featuring 25 high-grade chrome steel balls for consistent performance across its operating temperature range.
71917 ACD/PA9ADBC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
