71904 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71904 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71904 CD/P4ADBB is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement bearing set is preloaded to Light / Class B specifications, ensuring minimal axial and radial play for superior system stability. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other demanding machinery where high rigidity and running accuracy are paramount.
71904 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 71904: Basic bearing designation (Light series, 20mm bore, 37mm OD).
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial loads.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Specifies a super-precision tolerance class (equivalent to ABEC 7), guaranteeing extremely tight dimensional and running accuracy.
- DB: Defines the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and excellent operational stability.
- Open / Lubricated: The bearing is supplied open (no seals/shields) and is pre-lubricated for immediate use.
71904 CD/P4ADBB Bearing Structural Features & Performance Benefits
The performance of the 71904 CD/P4ADBB is derived from its meticulous construction. The duplex back-to-back configuration significantly increases system rigidity and resistance to moment loads. The phenolic resin cage offers excellent dimensional stability with low friction, contributing to smooth operation at the high limiting speed of 80,000 rpm. The P4A super-precision tolerance ensures minimal runout and vibration, which is critical for applications like machine tool spindles. The 15° contact angle provides an optimal balance between radial load capacity and axial load carrying capability.
71904 CD/P4ADBB Bearing Typical Application Areas
This high-precision bearing set is engineered for use in advanced machinery where accuracy and speed are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Medical and Dental Equipment (e.g., high-speed handpieces)
- Robotic Arm Joints and Precision Drives
