71908 ACD/P4ADGD
71900 Series Super Precision Angular Contact Ball Bearings
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71908 ACD/P4ADGD Bearing Product Overview & Core Advantages
The 71908 ACD/P4ADGD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it delivers superior performance in handling combined radial and axial loads. Manufactured to P4A tolerance class with a 25° contact angle and heavy preload (Class D), this bearing is engineered for high-stiffness applications in precision machinery and high-speed spindles.
71908 ACD/P4ADGD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation (40mm bore, 62mm OD, 24mm width) |
| AC | Angular Contact design with 25° contact angle |
| D | Heavy Preload (Class D) for maximum rigidity |
| P4A | High Precision Tolerance Class (superior to ABEC 7) |
| DGD | Universal Matchable (SU) - bearings can be arranged in multiple configurations |
71908 ACD/P4ADGD Bearing Structural Features & Performance Benefits
High Rigidity Design: The duplex bearing set with heavy preload (Class D) provides exceptional system stiffness, minimizing deflection under heavy combined loads.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing efficiently handles both radial loads (4275 lbf dynamic rating) and substantial axial loads in one direction.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring precise running accuracy and minimal vibration.
High-Speed Capability: The phenolic cage and optimized internal design enable operation at 41,000 rpm limiting speed, making it suitable for high-speed spindle applications.
Universal Matching Flexibility: As Universal Matchable (SU) bearings, they can be arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations to suit specific application requirements.
71908 ACD/P4ADGD Bearing Typical Application Areas
- Machine Tool Spindles - High-speed milling and grinding spindles requiring precision and rigidity
- Precision Gearboxes - Applications demanding accurate shaft positioning and high load capacity
- Industrial Pumps & Compressors - High-performance rotating equipment with combined loading conditions
- Robotic Systems - Precision joints and actuators requiring high stiffness and accuracy
- Aerospace Components - Control systems and auxiliary drives where reliability and precision are critical
