71930 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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71930 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71930 ACD/P4ATBTB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched triplex set in a back-to-back (TBT) configuration delivers superior combined load capacity, simultaneously handling significant radial and axial loads. Manufactured to P4A tolerance class with a light preload (Class B), it ensures optimal running accuracy and minimal vibration, making it ideal for high-speed, high-rigidity spindle systems.
71930 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing series and size designation (150mm bore, 210mm OD) |
| ACD | 25° contact angle, optimized for high axial load capacity |
| P4A | High precision tolerance class (superior to ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement (3 bearings) |
71930 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The triplex back-to-back configuration creates an extremely rigid bearing system, effectively resisting moment loads and maintaining shaft positioning accuracy under heavy cutting forces.
Superior Load Capacity: With a 25° contact angle and triple bearing arrangement, this set delivers outstanding combined load performance, handling both substantial radial loads (52,650 lbf dynamic) and bidirectional axial loads simultaneously.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 11,000 rpm. The precision-ground components minimize vibration at high rotational speeds.
Precision Performance: Manufactured to P4A tolerance standards with light preload, this bearing set ensures minimal runout, consistent rotational accuracy, and extended service life in precision applications.
71930 ACD/P4ATBTB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision milling applications
- Precision Gearboxes: Industrial transmission systems requiring high rigidity and accuracy
- Aerospace Components: Aircraft accessory drives and helicopter transmission systems
- High-Speed Motors: Spindle motors and high-performance industrial drives
- Medical Equipment: High-speed dental handpieces and precision medical devices
