71915 ACD/PA9ADT
71900 Series Super Precision Angular Contact Ball Bearings
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71915 ACD/PA9ADT Bearing Product Overview & Core Advantages
The 71915 ACD/PA9ADT is a precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional performance under combined loads. This metric bearing features a duplex tandem (DT) arrangement, where two preloaded bearings are matched to significantly increase axial load capacity in one direction, making it ideal for high-precision, high-reliability systems. Its PA9A tolerance class ensures superior running accuracy, while the phenolic cage contributes to smooth operation at high speeds.
71915 ACD/PA9ADT Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71915 | Basic bearing designation indicating the bearing size (75mm bore, 105mm OD, 32mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex arrangement (two bearings) |
| PA9A | High-precision tolerance class ensuring minimal runout and vibration |
| DT | Duplex Tandem mounting configuration for maximum unidirectional axial load capacity |
71915 ACD/PA9ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement creates an exceptionally rigid bearing system capable of handling heavy combined loads, particularly very high axial loads in one direction. The 25° contact angle is optimized for substantial axial load carrying capacity while maintaining good radial load performance.
Precision Performance: Manufactured to PA9A tolerance class standards, this bearing delivers superior dimensional accuracy and rotational precision. The phenolic resin cage provides excellent dimensional stability and reduced friction, contributing to smooth operation and extended service life.
High-Speed Capability: With a limiting speed of 22,000 rpm, this bearing is engineered for high-speed applications. The phenolic cage's lightweight properties and the optimized internal geometry enable stable operation at elevated rotational speeds.
Preloaded Configuration: The bearings are supplied preloaded in the duplex tandem arrangement, eliminating internal clearance and ensuring precise shaft positioning with minimal deflection under operational loads.
71915 ACD/PA9ADT Bearing Typical Application Areas
The 71915 ACD/PA9ADT is specifically designed for applications requiring high precision, rigidity, and unidirectional axial load capacity:
- Machine tool spindles for high-precision machining centers
- High-speed spindles in grinding and milling applications
- Precision rotary tables and indexing heads
- Industrial pumps and compressors requiring precise axial positioning
- Aerospace positioning systems and flight control mechanisms
- Medical equipment requiring high rotational accuracy
