71902 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71902 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71902 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a 25° contact angle and Extra Light (Class A) preload, it offers superior axial rigidity and minimizes rotational runout. Manufactured to the stringent P4A tolerance class, this bearing is universally matchable (SU), allowing for flexible mounting configurations in preloaded sets to achieve optimal system stiffness. Its compact design, with a 15 mm bore and 7 mm width, makes it ideal for high-precision spindles and other space-constrained, high-performance machinery.
71902 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 71902: Basic series designation for a super-precision, single-row angular contact ball bearing.
- AC: Angular Contact design.
- D: High contact angle (25°).
- GA: Specific internal design and preload grade (Extra Light / Class A).
- P4A: Tolerance class exceeding ABEC 7/ISO P4, indicating extremely tight dimensional and running accuracy tolerances.
71902 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and Class A preload provide high axial rigidity and precise rotational guidance, essential for applications like machine tool spindles. The P4A tolerance class ensures minimal runout and vibration.
- Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 95,000 rpm. The bearing comes pre-lubricated for immediate high-speed operation.
- Superior Load Capacity: Engineered to handle significant combined loads (simultaneous radial and axial forces), with a dynamic load rating of 848 lbf and a static load rating of 405 lbf.
- Universal Matching Capability (SU): This bearing is universally matchable, meaning any bearing can be mounted adjacent to another in any combination (face-to-face, back-to-back, or tandem) to create a preloaded set, simplifying inventory and assembly.
71902 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and optical scanners.
- High-Speed Motors and Drives: Spindles for PCB drilling and dental handpieces.
- Robotics: High-accuracy joints and actuators.
