71917 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 CD/P4ADBA
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
Extra light / Class A
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/P4ADBA Bearing Product Overview & Core Advantages
The 71917 CD/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a duplex back-to-back (DB) matched set, it is engineered to handle combined loads—significant radial and bidirectional axial loads simultaneously. Manufactured to the stringent P4A tolerance class, this bearing offers superior running accuracy, making it ideal for high-speed, high-precision machinery. Its preloaded Extra light (Class A) configuration ensures minimal axial and radial play, providing immediate system responsiveness and enhanced operational stability.
71917 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71917 CD/P4ADBA provides detailed technical specifications through its suffixes:
- 71917: Basic bearing series, indicating a metric, angular contact type with an 85 mm bore, 120 mm OD, and 36 mm width.
- CD: Denotes a duplex back-to-back (DB) arrangement with a specific preload. This configuration provides high moment rigidity and is optimal for applications with overturning moments.
- P4A: Specifies the tolerance class. P4A indicates very high precision for both dimensional and running accuracy, exceeding ABEC 7/ISO Class 4 standards.
- DB: Confirms the back-to-back mounting of the two bearings in the set.
- A: Indicates the preload level is "Extra light" or Class A, which minimizes friction and heat generation at high speeds.
71917 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a wide, rigid support system that effectively resists moment loads and complex combined loads. The 15° contact angle is optimized for carrying substantial axial loads in both directions alongside radial loads.
- Precision & High-Speed Performance: Built to P4A tolerance class, the bearing ensures minimal vibration and precise shaft guidance. The phenolic cage is lightweight and robust, contributing to smooth operation and a high limiting speed of 17,000 rpm. The Extra light preload (Class A) further enhances high-speed capability by reducing friction.
- Superior Material & Construction: Both rings and balls are made from high-grade Chrome Steel, providing excellent wear resistance and durability. The precision-ground components guarantee consistent performance and long service life under demanding conditions.
71917 CD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is critical in applications requiring high rigidity, speed, and accuracy. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and aerospace actuation systems.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Medical Equipment: Such as high-speed centrifuges and imaging device rotors.
- Printing and Paper Converting Machinery: For precise roller and cylinder support.
