71917 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71917 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71917 ACD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As a universally matchable (SU) bearing supplied in a pre-lubricated, matched set of two, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4A tolerance class and extra light preload (Class A) ensure smooth, precise operation with minimal runout, making it ideal for high-reliability, high-rigidity spindle arrangements where thermal stability and positional accuracy are critical.
Model Code Deep Explanation
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71917 | Basic bearing series and size designation | High-precision, high-speed angular contact bearing series with 85mm bore, 120mm OD, 36mm width. |
| AC | Angular Contact design | Optimized for combined radial and axial loads with a 25° contact angle. |
| D | High internal capacity design | Enhanced dynamic load rating through optimized internal geometry. |
| P4A | Tolerance class | Super-precision running accuracy with tight dimensional and geometrical tolerances. |
| DGA | Universal matchable pairing designation | Bearing is supplied as one of a universally matchable pair (SU) for simplified mounting and optimal preload control. |
71917 ACD/P4ADGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design with a 25° contact angle provides superior stiffness and enables the bearing to handle significant combined radial and axial loads. The high internal capacity (D) design further increases the dynamic load rating (16,088 lbf) for extended service life.
High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 28,000 rpm. The precision-ground chrome steel components ensure smooth operation with minimal vibration.
Precision & Thermal Stability: Manufactured to P4A tolerance class with an extra light preload, this bearing delivers exceptional running accuracy and is ideal for applications sensitive to thermal expansion, maintaining performance across a temperature range of -30°C to 110°C.
Simplified Installation: Being universally matchable (SU) and supplied as a pre-selected pair, these bearings simplify mounting procedures and ensure consistent, optimal preload when arranged back-to-back or face-to-face.
71917 ACD/P4ADGA Bearing Typical Application Areas
The 71917 ACD/P4ADGA is engineered for high-performance machinery requiring superior precision and speed. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and precision grinding machines.
- High-Speed Motors: Electric motor spindles and high-frequency drives.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
