S71930 CD/P4AQBCD
Sealed Super Precision Angular Contact Ball Bearings
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S71930 CD/P4AQBCD Bearing Product Overview & Core Advantages
The S71930 CD/P4AQBCD is a super-precision quadruplex back-to-back angular contact ball bearing designed for the most demanding industrial applications. This P4A tolerance class bearing offers exceptional rotational accuracy, high rigidity, and superior load-carrying capacity. Its matched set configuration of four bearings is preloaded to Class D (Heavy), providing outstanding stability and resistance to complex combined loads, including radial, axial, and moment loads. This makes it an ideal choice for high-speed, high-precision spindles requiring maximum system rigidity and long-term operational reliability.
S71930 CD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision angular contact ball bearing series
- 1930: Standard size designation (150mm bore, 210mm OD, 112mm width)
- CD: Polyamide (Phenolic) cage and 15° contact angle
- P4A: Super-precision tolerance class exceeding ABEC 7/ISO P4
- QBC: Quadruplex Back-to-Back matched arrangement
- D: Heavy preload classification
S71930 CD/P4AQBCD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement with heavy preload creates an extremely rigid bearing system capable of handling significant combined radial and axial loads in both directions, as well as moment loads. The 15° contact angle optimizes axial load capacity while maintaining excellent radial performance.
Precision & Speed Performance: Manufactured to P4A super-precision tolerances with bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures minimal runout and vibration. The phenolic cage contributes to lower friction and higher limiting speeds of up to 11,000 rpm, while the chrome steel balls and rings provide exceptional durability.
Optimized Design: With 23 balls of 19.05mm diameter, the bearing achieves an optimal balance between load distribution and speed capability. The grease lubrication and sealed design ensure consistent performance across the operating temperature range of -30°C to 110°C.
S71930 CD/P4AQBCD Bearing Typical Application Areas
The S71930 CD/P4AQBCD is specifically engineered for high-performance applications requiring ultimate precision and rigidity:
- Machine tool spindles for high-speed milling, grinding, and turning centers
- Precision grinding machine main spindles
- High-frequency motor spindles
- Aerospace testing equipment and precision positioning systems
- Industrial robotics requiring high rigidity and accuracy
- Specialized medical equipment spindles
