71908 CD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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71908 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 71908 CD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set delivers superior performance in handling combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it ensures minimal runout and high rotational accuracy. The moderate preload (Class C) enhances system stiffness and reduces vibration, making it ideal for high-speed, high-precision machinery where reliability is critical.
71908 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation (40mm bore, 62mm OD, 36mm width) |
| CD | High contact angle (15°) optimized for axial load capacity |
| P4A | Ultra-precision tolerance class for minimal dimensional variation |
| TBT | Triplex Back-to-Back arrangement providing maximum rigidity |
| C | Moderate preload for optimal stiffness and positioning accuracy |
71908 CD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity Design: The triplex back-to-back configuration creates an exceptionally rigid bearing system that minimizes deflection under heavy combined loads, ensuring precise shaft positioning and reduced vibration.
Enhanced Load Capacity: With a 15° contact angle and three-bearing arrangement, this set provides superior radial dynamic load rating (5962 lbf) and static load capacity (5738 lbf), making it suitable for applications with significant axial and radial force components.
Precision Performance: The P4A tolerance class guarantees tight dimensional control, while the phenolic cage ensures smooth operation at high speeds up to 56,000 rpm. The chrome steel construction of both rings and balls provides excellent durability and wear resistance.
Optimized Thermal Stability: The back-to-back arrangement accommodates thermal expansion effectively, maintaining preload and accuracy across the operating temperature range (-30°C to 110°C).
71908 CD/P4ATBTC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning applications requiring extreme precision and rigidity
- Precision Gearboxes: Industrial transmission systems demanding accurate shaft alignment and load distribution
- Robotic Arms: Joint and articulation points needing high stiffness and positional accuracy
- Aerospace Components: Flight control systems and auxiliary power units requiring reliable performance
- Medical Equipment: High-speed dental handpieces and surgical tools where precision and reliability are critical
