71908 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71908 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71908 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 pair configuration provides superior high rigidity and stability, enabling it to handle combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with an extra light preload (Class A), it is engineered for high-speed operation and precise positioning in critical machinery.
71908 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation (40mm bore, 62mm OD, 24mm width) |
| C | 15° contact angle |
| D | Duplex Back-to-Back (DB) arrangement |
| P4A | High precision tolerance class (exceeds ABEC 7) |
| DB | Duplex Back-to-Back matched set |
| A | Extra light preload (Class A) |
71908 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread between load centers, significantly increasing system rigidity and moment load capacity. This configuration is ideal for applications where shaft deflection must be minimized.
Precision Performance: Manufactured to P4A tolerance class with extremely tight dimensional runouts, this bearing ensures smooth, quiet operation and precise rotational accuracy. The 15° contact angle provides an optimal balance between radial and axial load capacity.
High-Speed Capability: The phenolic cage offers excellent strength-to-weight ratio, reduced friction, and superior performance at high rotational speeds, with a limiting speed of 56,000 rpm.
Premium Material Construction: Both rings and balls are manufactured from high-grade chrome steel, providing excellent wear resistance and long service life under demanding operating conditions.
71908 CD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers, grinding spindles
- Precision Instrumentation - Measuring devices, optical equipment
- High-Speed Motors - Servo motors, spindle motors
- Aerospace Components - Gyroscopes, navigation systems
- Medical Equipment - Dental handpieces, laboratory automation
