71938 ACD/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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71938 ACD/P4A Bearing Product Overview & Core Advantages
The 71938 ACD/P4A is a single-row angular contact ball bearing designed for applications requiring high precision and superior rotational accuracy. Engineered to a P4 (ABEC-7) tolerance class, it is optimized to handle significant combined loads, primarily thrust loads in one direction, while accommodating radial loads. Its 25° contact angle provides excellent axial load capacity and high rigidity, making it ideal for high-speed spindles and precision machinery. The bearing is pre-lubricated and features an open seal type for efficient operation within a wide temperature range of -30°C to 110°C.
71938 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing designation indicating size series and bore diameter (190mm) |
| AC | Angular Contact design with 25° contact angle |
| D | High contact angle for increased axial load capacity |
| P4A | P4 tolerance class (ABEC-7) with specific running accuracy requirements |
71938 ACD/P4A Bearing Structural Features & Performance Benefits
High Precision Construction: Manufactured to P4 tolerance class with tight dimensional control on bore diameter (190 mm), outside diameter (260 mm), and width (33 mm) for exceptional running accuracy.
Optimized Load Capacity: The 25° contact angle enables superior axial load carrying capacity while maintaining good radial load performance, with dynamic rating of 36,675 lbf and static rating of 46,800 lbf.
High-Speed Performance: Features a phenolic cage that reduces friction and enables limiting speeds up to 6,700 rpm, making it suitable for high-speed applications.
Premium Material Selection: Constructed from chrome steel for both rings and balls, ensuring durability and long service life under demanding conditions.
Preload Capability: Designed to accommodate preload for enhanced system stiffness and reduced vibration in precision applications.
71938 ACD/P4A Bearing Typical Application Areas
The 71938 ACD/P4A is specifically engineered for high-precision applications including:
- Machine tool spindles and high-speed machining centers
- Precision grinding machines and milling equipment
- High-frequency motor spindles
- Aerospace positioning systems
- Medical equipment spindles and rotary tables
- Robotic arm joints requiring high precision and rigidity
