71940 ACD/P4ADGCGMM3
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71940 ACD/P4ADGCGMM3 is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of the Universal Matchable (SU) series, this bearing is supplied in a pre-loaded pair, enabling it to handle combined loads—significant radial and axial loads in both directions—simultaneously. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-rigidity applications where minimal runout and maximum stability are critical.
71940 ACD/P4ADGCGMM3 Bearing Model Code Explained, Specifications & Naming Convention
- 71940: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a high-load capacity internal design.
- P4A: Indicates a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, with specific focus on runout and dimensional stability.
- D: Universal Matchable (SU) designation, meaning the bearing is designed to be mounted in pairs with a pre-set preload.
- GC: Specifies a moderate preload (Class C) for optimal rigidity and speed performance.
- G: Grease lubricated from the factory.
- MM: Identifies the cage material as phenolic (Polyamide), which is lightweight and suitable for high-speed operation.
- 3: A manufacturer-specific internal code related to the grease filling or other process specifications.
Structural Features and Performance Benefits
The performance of the 71940 ACD/P4ADGCGMM3 is derived from its sophisticated design and material selection. The 25° contact angle is optimized to support substantial axial loads. The Universal Matchable (SU) pairing allows for simplified mounting of two bearings to create a highly rigid system capable of withstanding complex load conditions and moments. The phenolic cage contributes to the bearing's high limiting speed (16,250 rpm) by reducing centrifugal forces and offering excellent guidance with minimal friction. The super-precision P4A tolerances on the bearing dimensions (bore, OD, and width) ensure predictable performance, low vibration, and extended service life in precision machinery.
71940 ACD/P4ADGCGMM3 Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are non-negotiable. Typical uses include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors requiring high shaft stability.
- Aerospace and Defense positioning systems and control surface actuators.
- Medical Equipment such as high-speed dental handpieces and imaging scanner gantries.
