71918 CD/P4ADGAGMM1
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4ADGAGMM1 Bearing Product Overview & Core Advantages
The 71918 CD/P4ADGAGMM1 is a super-precision angular contact ball bearing designed for the most demanding applications. As a P4A tolerance class bearing, it delivers exceptional running accuracy and dimensional stability. Its universal matchable (SU) design allows for flexible mounting in back-to-back (DB), face-to-face (DF), or tandem (DT) arrangements to meet specific rigidity and load requirements. The phenolic cage and extra light preload (Class A) contribute to its superior high-speed performance and low operating temperature, making it an ideal choice for machine tool spindles and other high-precision machinery.
71918 CD/P4ADGAGMM1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing designation, indicating a super-precision, light series angular contact ball bearing. |
| C | 15° contact angle, optimized for high-speed applications with combined loads. |
| D | Indicates a universal matchable (SU) bearing for paired mounting. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| DG | Universal pairing designation for back-to-back (DB) arrangement. |
| A | Extra light preload (Class A), minimizing friction and heat generation at high speeds. |
| GMM | Indicates the bearing is supplied as a grease-lubricated, universal matched pair. |
| 1 | Identifies the position or variant within the matched set. |
71918 CD/P4ADGAGMM1 Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class with a 15° contact angle, this bearing provides exceptional rotational accuracy and system stiffness, which is critical for maintaining precision in machining operations.
- Optimized for Combined Loads: The angular contact design efficiently supports combined radial and axial loads simultaneously, a common requirement in spindle applications.
- Superior High-Speed Capability: The lightweight phenolic resin cage ensures excellent dimensional stability and low centrifugal forces at the limiting speed of 15,000 rpm. The extra light preload further reduces friction and heat buildup.
- Matched Set Performance: Supplied as a universal matchable (SU) pair, these bearings are selectively assembled to provide consistent, pre-defined preload and optimal performance when mounted in DB, DF, or DT configurations.
- Material Integrity: Constructed from high-grade chrome steel for both rings and balls, ensuring long service life and reliability under demanding conditions.
71918 CD/P4ADGAGMM1 Bearing Typical Application Areas
The 71918 CD/P4ADGAGMM1 is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Robotics: High-accuracy joints and actuators.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical instrumentation.
