71917 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 CD/P4ADBC
Basic Information
System of measurement
Metric
Weight
1.06 kg
Tolerance class
P4A
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
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
17122 lbf
Radial static load rating
21712 lbf
Limiting speed
17 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
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In Stock
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71917 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71917 CD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional running accuracy. As a duplex back-to-back (DB) arrangement with a P4A tolerance class, this pre-matched set delivers superior performance under combined loads (radial and axial). Its moderate preload (Class C) ensures optimal stiffness and minimizes deflection, making it ideal for high-precision spindles and machinery where rotational accuracy is critical.
71917 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71917 CD/P4ADBC is decoded as follows:
- 71917: Basic bearing designation indicating a metric, angular contact ball bearing with an 85 mm bore, 120 mm OD, and 36 mm width.
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Specifies a high-precision tolerance class with enhanced dimensional and running accuracy, exceeding ABEC 7 standards.
- DB: Signifies the back-to-back mounting arrangement, which provides high moment rigidity and stability.
- C: Indicates a moderate preload (Class C) for increased stiffness.
71917 CD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing system rigidity and resistance to moment loads, which is crucial for maintaining precision under operational stresses.
- Superior Load Capacity: With a 15° contact angle and duplex design, this bearing set effectively handles combined radial and axial loads from both directions, offering a radial dynamic load rating of 17,122 lbf and a radial static load rating of 21,712 lbf.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class and featuring a lightweight phenolic cage, the bearing achieves a limiting speed of 17,000 rpm, ensuring smooth, low-vibration operation at high rotational velocities.
- Optimized Material & Construction: Components made from chrome steel provide high durability and wear resistance. The open seal type allows for efficient lubrication management, suitable for the specified temperature range of -30°C to 110°C.
71917 CD/P4ADBC Bearing Typical Application Areas
This high-precision duplex bearing set is ideally suited for applications requiring exceptional accuracy and rigidity, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Industrial Pumps.
- High-Frequency Motors and Robotic Arm Joints.
- Aerospace Positioning Systems and Medical Imaging Equipment.
