S71904 CD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71904 CD/P4ADBA Bearing Product Overview & Core Advantages
The S71904 CD/P4ADBA is a metric precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Extra Light (Class A) standards, ensuring minimal axial and radial play for superior system stability. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it ideal for high-precision, high-rigidity applications where positioning accuracy is critical.
Model Code Breakdown
- S7: High-precision bearing series
- 1904: Dimension series (19) and bore code (04 → 20 mm bore diameter)
- C: 15° nominal contact angle
- D: Duplex bearing (two single bearings paired)
- P4A: High precision tolerance class (exceeding ABEC 7, equivalent to ISO Class 4)
- DB: Back-to-Back arrangement of the duplex pair, providing high moment rigidity
- A: Extra Light preload class
S71904 CD/P4ADBA Bearing Structural Features & Performance Benefits
The bearing's performance is defined by its specific construction:
Duplex Back-to-Back (DB) Design: The two bearings are mounted face-to-face, creating a wide effective spread. This configuration provides high rigidity and excellent resistance to moment loads, which is crucial for maintaining accuracy under operational stresses.
P4A Precision & A Preload: Manufactured to an extremely tight P4A tolerance class, the bearing ensures minimal runout and vibration. The Extra Light preload (Class A) eliminates internal clearance, enhancing stiffness and rotational accuracy without generating excessive heat, contributing to a high limiting speed of 75,000 rpm.
Phenolic Resin Cage: The lightweight and robust phenolic cage ensures stable operation at high speeds, offering low friction and excellent acceleration characteristics.
Chrome Steel Components: Made from high-grade chrome steel for both rings and balls, the bearing delivers high fatigue life and durability under demanding dynamic and static load ratings (2194 lbf / 1440 lbf).
S71904 CD/P4ADBA Bearing Typical Application Areas
The S71904 CD/P4ADBA is engineered for high-performance machinery where precision and speed are paramount. Key applications include:
High-Speed Machine Tool Spindles: For CNC milling, grinding, and drilling where high rigidity and runout accuracy are critical.
Precision Rotary Systems: In semiconductor manufacturing equipment, coordinate measuring machines (CMM), and optical scanners.
High-Frequency Motors and Spindles: Used in applications requiring smooth operation at very high rotational speeds.
Medical and Laboratory Equipment: For centrifuges and other precision instruments requiring reliable, low-vibration operation.
