71917 ACD/P4ADGC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71917 ACD/P4ADGC
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
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
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71917 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 71917 ACD/P4ADGC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. Engineered to a P4A tolerance class, this bearing is capable of simultaneously supporting combined radial and axial loads. Its universal matchable (SU) design allows for flexible mounting arrangements in pairs to achieve optimal preload and system stiffness. The phenolic cage and 25-degree contact angle contribute to its high-speed capabilities and stable performance under moderate preload (Class C), making it an ideal choice for high-reliability, precision machinery.
71917 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71917 ACD/P4ADGC provides detailed technical specifications:
- 71917: Basic bearing series and size designation (85mm bore, 120mm OD, 36mm width)
- A: 25-degree contact angle
- CD: Universal matchable bearing design (can be mounted in either "DB" or "DF" configurations)
- P4A: High precision tolerance class exceeding ABEC 7/ISO P4 standards
- DGC: Indicates the bearing is supplied as part of a universally matchable pair (2 bearings in set)
71917 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double-row angular contact design provides superior radial and axial stiffness, with a dynamic load rating of 16,088 lbf and static load rating of 20,588 lbf. This enables reliable operation under significant combined loads.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for precision applications.
- High-Speed Capability: The phenolic cage and optimized internal geometry allow for a limiting speed of 28,000 rpm, making it suitable for high-speed spindle applications.
- Thermal Stability: The phenolic cage material maintains dimensional stability across the operating temperature range of -30°C to 110°C.
- Pre-loaded Configuration: Supplied as a universally matchable pair with moderate preload (Class C), ensuring immediate optimal performance without additional adjustment.
71917 ACD/P4ADGC Bearing Typical Application Areas
This precision bearing is specifically engineered for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial transmission systems requiring high accuracy
- Robotic Systems: High-precision joints and rotary actuators
- Aerospace Components: Flight control systems and auxiliary power units
- Medical Equipment: High-speed dental handpieces and surgical tools
- Semiconductor Manufacturing: Wafer handling robots and precision positioning stages
