71904 CD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
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71904 CD/P4ADBD Bearing Product Overview & Core Advantages
The 71904 CD/P4ADBD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement provides superior stiffness and moment load capacity, making it ideal for high-precision spindles and machinery. Preloaded to Heavy / Class D standards, it ensures minimal axial and radial play, delivering consistent performance under combined loads. Manufactured to P4A tolerance class, this bearing guarantees exceptional running accuracy for critical operations.
71904 CD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Bearing series and size designation (20mm bore, 37mm OD) |
| C | 15° contact angle |
| D | Heavy preload (Class D) |
| P4A | High precision tolerance class (exceeds ABEC 7) |
| DB | Duplex Back-to-Back arrangement |
71904 CD/P4ADBD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and combined radial and axial loads. The heavy preload eliminates internal clearance, ensuring maximum system stiffness and precise rotational accuracy.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy. The phenolic cage provides excellent guidance at high speeds while reducing friction.
Optimized Design: With 15 precision balls and a 15° contact angle, the bearing is engineered for high-speed operation up to 80,000 rpm. The chrome steel construction ensures durability and long service life in demanding conditions.
71904 CD/P4ADBD Bearing Typical Application Areas
- Machine tool spindles and high-precision machining centers
- High-speed machining applications requiring extreme accuracy
- Precision grinding spindles and CNC machining centers
- Robotic arm joints and precision positioning systems
- Medical equipment and dental handpieces
- Aerospace positioning mechanisms
