S71909 CD/P4ADBC
Sealed Super Precision Angular Contact Ball Bearings
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S71909 CD/P4ADBC Bearing Product Overview & Core Advantages
The S71909 CD/P4ADBC is a precision duplex pair of double row angular contact ball bearings designed for applications demanding exceptional rotational accuracy and rigidity. This sealed bearing set is preloaded (Moderate / Class C) and arranged in a Back-to-Back (DB) configuration, enabling it to withstand significant combined loads—both radial and bidirectional axial loads—simultaneously. Manufactured to the exacting P4A tolerance class, it is an ideal solution for high-speed spindles and other high-precision machinery where dimensional stability and reliable performance are critical.
S71909 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision bearing series with a 15° contact angle.
- 1909: Standard size designation (Bore: 45mm, OD: 68mm, Width: 12mm per bearing).
- CD: Indicates a duplex pair with a specific preload and Back-to-Back (DB) arrangement.
- P4A: Denotes a super-precision tolerance class with enhanced running accuracy.
- DBC: Specifies the duplex combination type (DB) and preload class (C).
The combination of P4A tolerance and moderate preload ensures minimal runout and high system stiffness, which is essential for precision applications.
S71909 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex Back-to-Back (DB) arrangement creates a robust, statically determinate system that provides high moment stiffness and excellent resistance to overturning moments. This configuration allows the bearing set to handle substantial combined radial and axial loads from both directions.
Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional control on bore, outside diameter, and width, resulting in superior running accuracy and reduced vibration levels.
Optimized High-Speed Operation: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower centrifugal forces and stable operation at the limiting speed of 46,000 rpm.
Sealed & Pre-Lubricated: The integrated seals protect against contamination and retain the factory-applied grease lubrication, ensuring long-term, maintenance-free operation within the specified temperature range of -30°C to 110°C.
S71909 CD/P4ADBC Bearing Typical Application Areas
The S71909 CD/P4ADBC is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables and indexing heads.
- High-Frequency Spindles for PCB drilling and routing.
- Medical Equipment such as high-speed dental handpieces.
- Advanced Robotics and automation systems requiring high positional accuracy.
