71912 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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71912 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71912 ACD/P4ATBTB is a high-precision angular contact ball bearing designed for applications demanding 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 with a light preload (Class B), it ensures minimal runout and stable rotational accuracy, making it ideal for high-speed, high-rigidity spindles and precision machinery.
71912 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing designation (60mm bore, 85mm OD) |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement of 3 bearings |
71912 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
Optimized Rigidity & Load Capacity: The triplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and moments. The 25° contact angle provides excellent axial load capacity in both directions.
High-Speed Performance: Featuring a phenolic cage and precision-ground chrome steel components, this bearing achieves a limiting speed of 33,000 rpm. The light preload ensures stable operation at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and minimal vibration for precision applications.
Enhanced Durability: The chrome steel construction and optimized ball quantity (24) and ball diameter (7.938mm) provide high dynamic (9,068 lbf) and static (9,900 lbf) load ratings for extended service life.
71912 ACD/P4ATBTB Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers and grinding spindles
- Precision Industrial Pumps - Chemical processing and hydraulic systems
- High-Speed Compressors - Air and gas compression equipment
- Robotic Systems - Precision joints and rotary actuators
- Aerospace Components - Guidance systems and auxiliary power units
