71934 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71934 ACD/P4A Bearing Product Overview & Core Advantages
The 71934 ACD/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. Positioned in the P4 (ABEC-7) tolerance class, it is designed to handle significant combined loads, primarily thrust loads in one direction, thanks to its 25° contact angle. Its key advantages include high-speed capability with a limiting speed of 7,500 rpm, high rigidity from its optimized internal geometry, and preload availability for enhanced system stiffness and reduced vibration in precision assemblies.
71934 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71934 | Basic bearing designation indicating size series (19) and bore diameter (170 mm) |
| AC | Angular Contact design with a 25° contact angle |
| D | High contact angle for increased thrust load capacity |
| P4A | High-Precision Tolerance Class (equivalent to ABEC-7), with specific running accuracy requirements |
71934 ACD/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4 tolerance class with tight dimensional control on bore diameter (170 mm), outside diameter (230 mm), and width (28 mm) for exceptional running accuracy.
Optimized Internal Geometry: Features a 25° contact angle and 29 high-precision chrome steel balls (19.05 mm diameter) for superior thrust load capacity and smooth operation at high speeds.
High-Speed Performance: The phenolic resin cage ensures low friction and excellent dimensional stability, contributing to the high limiting speed of 7,500 rpm.
High Rigidity & Load Capacity: The single-row design, combined with available preload, provides high system stiffness, supporting a dynamic load rating of 27,900 lbf and a static load rating of 36,000 lbf.
Open Design & Lubrication: The open seal type allows for customized lubrication regimes, suitable for a wide temperature range from -30°C to 110°C.
71934 ACD/P4A Bearing Typical Application Areas
The 71934 ACD/P4A is ideally suited for high-precision, high-speed rotational systems, including:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Frequency Motors and precision spindles
- Robotic Arm Joints and precision automation equipment
- Aerospace Actuation Systems and auxiliary power units
- Medical Equipment such as high-speed dental handpieces and imaging devices
