71908 CD/DBG32VQ253
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71908 CD/DBG32VQ253 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 stability and is preloaded to eliminate internal clearance, ensuring high system stiffness and precise rotational accuracy. It is engineered to handle combined loads—significant radial loads and axial loads in both directions—simultaneously. Manufactured to a P4A tolerance class, it is ideal for high-speed, high-precision machinery where reliability and performance are critical.
71908 CD/DBG32VQ253 Bearing Model Code Explained, Specifications & Naming Convention
- 71908: Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width).
- C: Indicates a 15° contact angle, optimized for high-speed operation and axial load capacity.
- D: Denotes a duplex pair of bearings.
- DB: Specifies the back-to-back mounting arrangement, which provides high moment rigidity.
- G: Specifies the preload level within the matched set.
- 32V: Code related to internal design and cage specification.
- Q253: Indicates the use of a specific, high-performance phenolic resin cage.
Structural Features and Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) design creates a wide, stable support system that significantly increases resistance to moment loads, making it ideal for applications requiring maximum shaft positioning accuracy.
Superior Load Capacity: With a 15° contact angle and a dynamic radial load rating of 4478 lbf, this bearing is engineered to handle demanding combined radial and axial loads.
High-Speed Performance: The lightweight, high-strength phenolic cage (Q253) and precision P4A-grade manufacturing contribute to a high limiting speed of 41,000 rpm, reducing friction and heat generation.
Precision and Accuracy: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, this bearing ensures minimal runout and consistent performance in precision spindles.
71908 CD/DBG32VQ253 Bearing Typical Application Areas
This high-precision duplex bearing is typically employed in:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where extreme accuracy and rigidity are paramount.
- High-Frequency Motors and Spindles: Demanding high rotational speeds and low vibration.
- Industrial Pumps and Compressors: For applications requiring robust performance under combined loads.
