71940 ACDGB/P4A
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 ACDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a single bearing with Universal Matchable (SU) capability, it can be precisely paired with two other identical bearings to form a matched set that delivers superior performance. Its defining characteristics include a 25° contact angle and a Light preload (Class B), making it ideally suited for applications requiring high rigidity, excellent high-speed capability, and the ability to handle combined loads (radial and axial). The P4A tolerance class ensures ultra-precision operation, while the phenolic cage contributes to smooth performance at high rotational speeds.
71940 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71940 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | High load carrying capacity internal design. |
| GB | Universal Matchable (SU) bearing. Can be mounted in any combination (back-to-back, face-to-face, or tandem) with other GB bearings to form a pre-adjusted set. |
| /P4A | Ultra-precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration for high-precision applications. |
Structural Features and Performance Benefits
Optimized Internal Geometry: The 25° contact angle and optimized internal geometry are engineered to support significant combined radial and axial loads simultaneously. The high dynamic and static load ratings (44,775 lbf and 56,250 lbf respectively) ensure long service life under demanding conditions.
High-Speed Phenolic Cage: The phenolic resin cage is a key feature for high-speed performance. It is lightweight, strong, and exhibits excellent sliding properties, which reduces friction and heat generation, contributing to the bearing's high limiting speed of 6,300 rpm.
Precision and Rigidity: Manufactured to a P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy. This results in superior rotational precision, reduced vibration, and enhanced system rigidity, which is critical for maintaining accuracy in machining and positioning.
Universal Matching: The Universal Matchable (SU/GB) designation means each bearing is manufactured to specific tolerances that allow it to be universally matched with others from the same batch. This simplifies installation and ensures optimal preload and performance in matched sets of two or three bearings.
71940 ACDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision, rigidity, and speed are paramount.
- Precision Gearboxes: Applications requiring accurate shaft positioning and high load capacity.
- High-Frequency Motors and Spindles: Where minimal runout and smooth operation at high RPM are critical.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments demanding high reliability and accuracy.
- Aerospace and Defense Systems: Actuators, control surface mechanisms, and other critical rotational components.
