71918 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71918 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71918 ACDGA/P4A is a single-row angular contact ball bearing engineered for ultra-precision applications requiring exceptional rotational accuracy and rigidity. Positioned in the P4A super-precision tolerance class, it delivers superior running accuracy and dimensional stability. Its 25° contact angle is optimized to handle significant combined radial and axial loads in one direction, making it an ideal choice for high-speed spindles and precision machinery where high rigidity and minimal runout are critical. The bearing is pre-lubricated and features a lightweight phenolic cage, contributing to its high limiting speed of 15,000 rpm.
71918 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | High ball diameter and quantity for increased load capacity. |
| GA | Indicates the bearing is part of a Universal Matchable (SU) set. This specific bearing has an Extra light (A) preload when mounted in a specific arrangement with other bearings from the set. |
| /P4A | Denotes a super-precision tolerance class, with extremely tight limits on bore, outside diameter, and width tolerances for supreme running accuracy. |
71918 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and optimized internal geometry, including a large ball diameter and 26 balls, provide high resistance to deflection under combined loads, ensuring system stability.
- Super-Precision Performance: Manufactured to P4A tolerance class with very tight dimensional controls (e.g., bore/OD tolerance: -0.004mm to 0), guaranteeing minimal runout and vibration for exceptional application accuracy.
- High-Speed Capability: The lightweight and robust phenolic resin cage minimizes centrifugal forces, while the pre-lubrication and open design reduce friction, enabling a high limiting speed of 15,000 rpm.
- Universal Matching Design (SU): As part of a universally matchable set, this bearing can be mounted in various preload configurations (back-to-back, face-to-face, or tandem) with other bearings from the same manufactured lot, offering design flexibility and simplified assembly.
71918 ACDGA/P4A Bearing Typical Application Areas
The 71918 ACDGA/P4A is specifically designed for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace Positioning Systems
- Medical and Dental Equipment Spindles
