S71918 ACD/P4ADGB
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71918 ACD/P4ADGB Bearing Product Overview & Core Advantages
The S71918 ACD/P4ADGB is a high-precision double row angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to simultaneously handle combined radial and bidirectional axial loads, this bearing features a universal matchable (SU) design, allowing two bearings to be paired in a pre-loaded arrangement for optimal performance. With its P4A super-precision tolerance class and phenolic cage, it delivers superior high-speed capability and stability, making it an ideal choice for high-reliability, high-accuracy machinery.
S71918 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Indicates a high-precision angular contact ball bearing series. |
| 1918 | Specifies the bearing dimensions: 90mm bore, 125mm OD, 36mm width. |
| ACD | Denotes a 25° contact angle and a universal matchable (SU) design for duplex mounting. |
| P4A | Signifies a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| DGB | Indicates a sealed bearing, pre-lubricated with grease, offering protection from contaminants and extended service life. |
S71918 ACD/P4ADGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row angular contact design provides a rigid support system, capable of withstanding significant combined loads from multiple directions. The 25° contact angle is optimized for handling substantial bidirectional axial loads in addition to radial loads.
High-Speed Performance: The lightweight phenolic cage ensures minimal centrifugal forces and excellent dimensional stability at high rotational speeds, contributing to the bearing's high limiting speed of 15,000 rpm.
Precision & Longevity: Manufactured to P4A tolerance class with chrome steel rings and balls, this bearing guarantees minimal runout and smooth operation. The integral seals and pre-applied grease lubrication provide effective contamination protection and contribute to a maintenance-free, long service life within a wide temperature range of -30°C to 110°C.
S71918 ACD/P4ADGB Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications where accuracy, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Instrumentation and Measuring Equipment
- Medical Equipment (e.g., high-speed dental handpieces)
- Aerospace Actuation Systems
