71915 CD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71915 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 71915 CD/P4ATBTA is a super-precision angular contact ball bearing designed for the most demanding applications. Engineered as part of a matched triplex back-to-back (TBT) set, this bearing delivers exceptional system rigidity and rotational accuracy. Its extra light preload (Class A) ensures minimal friction and smooth operation, making it ideal for high-speed spindles and other precision machinery where high rigidity and superior running accuracy are paramount. The bearing comes pre-lubricated for immediate service.
71915 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71915 | Bearing series and size designation | Indicates a 75 mm bore, 105 mm OD, 48 mm width bearing from the 719 series. |
| CD | 15° contact angle | Optimized for high-speed operation and moderate axial load capacity. |
| P4A | Tolerance class | Denotes super-precision dimensional and running accuracy, exceeding ABEC 7/ISO P4 standards. |
| TBT | Triplex Back-to-Back arrangement | Specifies that this is one of three bearings in a pre-matched set, mounted back-to-back, to provide maximum system rigidity and moment load capacity. |
| A | Extra light preload | Ensures minimal friction and heat generation, enabling higher limiting speeds. |
71915 CD/P4ATBTA Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The triplex back-to-back (TBT) configuration is the core of this bearing's performance. By using three bearings in a matched set, it creates an extremely rigid support system capable of withstanding heavy combined loads (radial and axial) and significant moment loads, which is critical for maintaining precision under operational stresses.
High-Speed Capability: The combination of a 15° contact angle, extra light preload, and a lightweight phenolic cage allows this bearing to achieve a high limiting speed of 36,000 rpm. The phenolic cage offers excellent strength-to-weight ratio and operates smoothly at high rotational velocities.
Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees exceptional dimensional stability and running accuracy. This results in reduced vibration and noise, leading to superior finish quality in machining applications and extended service life for the entire spindle assembly.
Robust Material Construction: Made from high-grade chrome steel for both rings and balls, the bearing provides high fatigue life and durability under demanding conditions.
71915 CD/P4ATBTA Bearing Typical Application Areas
The 71915 CD/P4ATBTA is specifically engineered for high-performance machinery requiring the ultimate in precision and speed. Key applications include:
- High-Speed Machine Tool Spindles: For CNC milling, grinding, and jig boring machines.
- Precision Grinding Spindles: Where extreme accuracy and surface finish are required.
- High-Frequency Machining Centers: Demanding applications that combine high RPM with high rigidity.
- Advanced Robotics: Precision joints and arm assemblies requiring high moment stiffness.
