S71908 CD/P4ADBD
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71908 CD/P4ADBD Bearing Product Overview & Core Advantages
The S71908 CD/P4ADBD is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This metric system bearing features a back-to-back (DB) matched arrangement with a heavy preload (Class D), enabling it to withstand significant combined loads (radial and axial) from both directions simultaneously. Its compact design, superior dimensional stability, and P4A tolerance class make it an ideal choice for high-precision, high-reliability machinery requiring maximum stiffness and rotational accuracy.
Model Code Breakdown
- S7: High-grade precision bearing series
- 1908: Standard size designation (40mm bore, 62mm OD, 24mm width)
- C: 15-degree contact angle
- D: Heavy preload classification
- P4A: Ultra-precision tolerance class exceeding ABEC 7
- DB: Duplex arrangement in back-to-back configuration
S71908 CD/P4ADBD Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement with heavy preload creates a highly rigid bearing system capable of handling substantial moment loads and combined radial and axial loads from both directions. This configuration significantly increases system stability under demanding operating conditions.
Precision Performance: Manufactured to P4A tolerance class, this bearing delivers exceptional running accuracy and minimal vibration. The 15-degree contact angle optimizes axial load capacity while maintaining excellent high-speed capability.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling limiting speeds up to 41,000 rpm. This makes the bearing suitable for high-speed spindle applications.
Superior Material Construction: Manufactured from chrome steel for both rings and balls, the bearing offers excellent wear resistance and fatigue life. The sealed design with grease lubrication provides reliable operation across a temperature range of -30°C to 110°C.
S71908 CD/P4ADBD Bearing Typical Application Areas
This high-precision duplex bearing is specifically engineered for applications requiring maximum rigidity and accuracy:
- Machine tool spindles for milling, grinding, and turning centers
- High-speed machining centers and precision manufacturing equipment
- Industrial pumps and compressors requiring precise shaft positioning
- Precision instrumentation and measuring devices
- Robotic arm joints and automation equipment
- Aerospace positioning systems and guidance mechanisms
