71911 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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71911 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71911 ACD/P4ATBTC is a super-precision angular contact ball bearing supplied as a matched triplex set in a Back-to-Back (TBT) arrangement. Engineered to P4A tolerance class, this bearing is designed for applications demanding exceptional rotational accuracy, high system rigidity, and reliable performance under combined radial and axial loads. The moderate preload (Class C) and phenolic cage contribute to stable operation at high speeds, making it an ideal choice for high-performance spindles and precision machinery.
71911 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Bearing series and size designation (55mm bore, 80mm OD, 39mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Moderate preload (Class C) for optimized rigidity and speed |
| P4A | High precision tolerance class (superior to ABEC 7) |
| TB | Triplex Back-to-Back matched set arrangement |
| T | Phenolic (resin) cage for reduced weight and high-speed capability |
| BTC | Universal matching not required (standard set) |
71911 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The triplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and moment loads. With a radial dynamic load rating of 8932 lbf and static load rating of 9338 lbf, this bearing delivers reliable performance in demanding applications.
High-Speed Performance: The phenolic cage and optimized internal geometry enable operation at limiting speeds up to 46,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity while maintaining high-speed capability.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for applications requiring exceptional rotational accuracy.
Thermal Stability: The phenolic cage material and chrome steel construction maintain dimensional stability across the operating temperature range of -30°C to 110°C.
71911 ACD/P4ATBTC Bearing Typical Application Areas
The 71911 ACD/P4ATBTC is specifically designed for high-performance applications including:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Spindles - PCB drilling, semiconductor manufacturing equipment
- High-Speed Motors - Industrial servo motors and high-frequency spindles
- Aerospace Components - Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment - Dental handpieces, laboratory centrifuges
