71808 CD/P4DT
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71808 CD/P4DT Bearing Product Overview & Core Advantages
The 71808 CD/P4DT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) matched set features a P4 tolerance class for superior running accuracy and is preloaded to eliminate internal clearance, ensuring high system rigidity and precise shaft positioning. Its compact design, combined with the ability to handle significant combined loads (radial and axial), makes it ideal for high-speed, high-precision machinery where reliability is paramount.
71808 CD/P4DT Bearing Model Code Explained, Specifications & Naming Convention
The model number 71808 CD/P4DT provides detailed technical specifications:
- 71808: Basic bearing series, indicating a metric, angular contact type with a 40mm bore.
- C: Denotes a 15° contact angle, optimized for high-speed operation and axial load capacity.
- D: Indicates the bearing is manufactured to a P4 tolerance class, signifying very high precision.
- P4: Reiterates the tolerance class (ABEC 7 / ISO P4).
- DT: Signifies a Duplex Tandem arrangement. Two bearings are mounted together in tandem to increase axial load capacity in one direction.
71808 CD/P4DT Bearing Structural Features & Performance Benefits
The performance of the 71808 CD/P4DT is a direct result of its advanced design and material selection:
- High Rigidity & Axial Load Capacity: The duplex tandem (DT) arrangement combines two bearings to create a highly rigid assembly capable of supporting substantial axial loads in one direction, making it suitable for preloaded spindles.
- Precision & High-Speed Performance: Manufactured to a P4 tolerance class with a 15° contact angle, this bearing ensures minimal vibration and stable operation at high rotational speeds, with a limiting speed of 56,000 rpm.
- Optimized Cage Design: The phenolic resin cage is lightweight and robust, offering excellent performance at high speeds with reduced friction and improved lubrication flow.
- Superior Material: Constructed from chrome steel for both rings and balls, providing high fatigue life and durability under demanding operating conditions.
71808 CD/P4DT Bearing Typical Application Areas
The 71808 CD/P4DT is engineered for high-performance applications where precision and speed are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motors and spindles.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation instruments.
- Medical Equipment: Dental handpieces and small high-speed surgical tools.
