71905 CD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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71905 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 71905 CD/P4ATBTC is a metric system, triplex matched set of precision angular contact ball bearings designed for applications demanding exceptional rotational accuracy and rigidity. This P4A tolerance class bearing set, arranged in a Back-to-Back (TBT) configuration, is engineered to handle combined loads (radial and axial) simultaneously. Its moderate preload (Class C) ensures high system stiffness and precise shaft positioning, making it ideal for high-performance, high-reliability machinery where minimal runout and thermal stability are critical.
71905 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 27mm width). |
| C | 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates a matched bearing set. |
| P4A | High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy limits. |
| TB | Arrangement: Triplex Back-to-Back. Three bearings are matched and mounted back-to-back. |
| TBT | Full designation for the matched arrangement: Triplex Back-to-Back. |
71905 CD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a statically determinate bearing system that provides exceptional moment stiffness and resistance to tilting moments, ensuring precise shaft guidance under complex loads.
Superior Load Capacity: The combination of three bearings significantly increases the radial dynamic load rating (3285 lbf) and static load rating (2700 lbf), enabling the set to handle demanding combined loads effectively.
Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent sliding properties, contributing to lower friction and stable operation at the high limiting speed (100,500 rpm). The 15° contact angle is ideal for high-speed applications where axial loads are present.
Precision and Accuracy: Manufactured to P4A tolerance class with very tight bore, outside diameter, and width tolerances, this set guarantees minimal runout and superior rotational accuracy for critical spindle applications.
71905 CD/P4ATBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for advanced machinery requiring the utmost accuracy and performance:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Speed Robotic Drives and Actuators
- Advanced Medical Equipment Spindles (e.g., in dental drills and surgical tools)
- Aerospace Test and Measurement Equipment
