71905 ACD/PA9AQBCB
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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71905 ACD/PA9AQBCB Bearing Product Overview & Core Advantages
The 71905 ACD/PA9AQBCB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This bearing is supplied as a Quadruplex Back-to-Back (QBC) matched set, consisting of four individual bearings pre-configured to deliver superior performance. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high stability. Manufactured to an ultra-precision PA9A tolerance class and featuring a light preload (Class B), it is engineered for high-speed operation and applications where minimal runout and high rotational accuracy are critical.
71905 ACD/PA9AQBCB Bearing Model Code Explained, Specifications & Naming Convention
- 71905: Basic bearing series and size designation (25mm bore, 42mm OD, 36mm width).
- ACD: Angular Contact design with a 25° contact angle.
- PA9A: Denotes the ultra-precision tolerance class, ensuring minimal dimensional variation for high-accuracy applications.
- QBC: Specifies the Quadruplex Back-to-Back matched arrangement, providing high rigidity and moment load capacity.
- B: Indicates a Light Preload (Class B) is applied to the matched set, reducing axial play and enhancing system stiffness.
71905 ACD/PA9AQBCB Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates a highly rigid bearing system capable of supporting significant combined loads and moment loads, making it ideal for precision spindles.
- High-Speed Performance: The phenolic cage offers low weight and excellent performance at high rotational speeds, contributing to the bearing's high limiting speed.
- Ultra-Precision Operation: Manufactured to PA9A tolerance class with a 25° contact angle, this bearing ensures exceptional running accuracy, low vibration, and precise positioning.
- Optimized Material Selection: Components made from chrome steel for rings and balls provide high durability and fatigue resistance, ensuring long service life under demanding conditions.
71905 ACD/PA9AQBCB Bearing Typical Application Areas
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Medical and Dental Equipment Spindles
