71912 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71912 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71912 CD/P4ADBA is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set delivers superior performance in handling combined loads, including significant radial and axial loads in both directions. Manufactured to P4A tolerance class, it offers extremely tight dimensional control for high-precision spindle arrangements. Its extra light preload (Class A) ensures minimal runout and optimal stiffness, making it an ideal choice for high-speed, high-rigidity applications where precision is paramount.
71912 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing series and size designation (60mm bore, 85mm OD). |
| C | 15° contact angle, optimized for high-speed operation and axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) pair. |
| P4A | High precision tolerance class, specifying extremely tight limits on bore, outside diameter, and width runout. |
| DB | Back-to-Back mounting arrangement. This configuration provides high moment rigidity and excellent stability under complex loads. |
| A | Specifies the extra light preload (Class A) applied to the matched set, minimizing friction and heat generation at high speeds. |
71912 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) pairing creates a highly rigid bearing system that effectively resists moment loads and complex combined loads. The 15° contact angle provides a balanced capacity for radial and bidirectional axial loads.
Precision & High-Speed Performance: Manufactured to P4A precision tolerances with an extra light preload, this bearing set ensures minimal vibration and precise shaft positioning. The phenolic resin cage offers low weight and excellent performance at the high limiting speed of 36,000 rpm, even under lubricated conditions.
Superior Material & Construction: Components made from chrome steel provide high fatigue life and durability. The set comes pre-lubricated and is suitable for a wide operating temperature range from -30°C to 110°C, ensuring immediate readiness for installation and operation.
71912 CD/P4ADBA Bearing Typical Application Areas
This precision bearing set is engineered for high-performance machinery where accuracy, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables: Indexing and positioning systems.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical Equipment: High-speed dental handpieces and imaging scanners.
- Aerospace Test Rigs: Precision positioning and simulation equipment.
