7215 ACDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7215 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7215 ACDGA/P4A is a high-precision single row angular contact ball bearing engineered for applications demanding exceptional accuracy and reliability. Its defining feature is the 25° contact angle and P4A super-precision tolerance class, making it ideally suited for high-speed spindles and other precision machinery. This bearing is designed to accommodate combined loads, primarily handling substantial axial loads in one direction along with radial loads. The extra light preload (Class A) minimizes deflection and ensures smooth, quiet operation at high rotational speeds, while its universal matching capability allows for flexible mounting arrangements in complex spindle designs.
7215 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7215 | Basic bearing series; 75 mm bore, 130 mm OD, 25 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Universal Matchable (SU) bearing. Can be paired in various arrangements (back-to-back, face-to-face, tandem). |
| P4A | Super Precision tolerance class, exceeding ABEC 7/ISO P4 standards, with enhanced running accuracy. |
7215 ACDGA/P4A Bearing Structural Features & Performance Benefits
The performance of the 7215 ACDGA/P4A is a direct result of its meticulous construction:
- High-Speed Capability: The lightweight and robust phenolic resin cage minimizes centrifugal forces and ensures stable operation at the high limiting speed of 22,000 rpm. The open design facilitates efficient lubrication and heat dissipation.
- Superior Rigidity and Accuracy: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width, this bearing provides exceptional running accuracy and system stiffness, critical for machining precision.
- Optimized Load Capacity: The 25° contact angle is optimized to handle significant one-direction axial loads and radial loads simultaneously. With a dynamic load rating of 15,502 lbf and a static load rating of 13,162 lbf, it offers reliable performance under demanding conditions.
- Pre-Configured Performance: The extra light preload (Class A) is built-in, reducing initial bearing deflection and ensuring immediate high-performance operation without complex adjustment, leading to reduced vibration and noise.
7215 ACDGA/P4A Bearing Typical Application Areas
The 7215 ACDGA/P4A is the bearing of choice in high-performance applications where speed, precision, and rigidity are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arms.
- Medical Equipment: Dental handpieces and surgical drill spindles.
- Aerospace Test Rigs: Precision positioning and simulation equipment.
