71920 ACBGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71920 ACBGA/P4A Bearing Product Overview & Core Advantages
The 71920 ACBGA/P4A is a single-row angular contact ball bearing designed for ultra-high precision applications requiring exceptional running accuracy and rotational stability. Manufactured to P4A tolerance class, this bearing delivers superior dimensional and geometric precision. Its 25° contact angle is optimized to support significant combined loads, handling both radial and axial forces simultaneously. The phenolic resin cage and factory-applied lubrication contribute to its high-speed capability, making it an ideal choice for machine tool spindles and other demanding, high-rigidity applications.
71920 ACBGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Bearing series and size designation (100mm bore, 140mm OD, 20mm width) |
| AC | Angular Contact design |
| BGA | Universal Matchable bearing, designed for preloaded sets |
| P4A | High precision tolerance class, superior to ABEC-7 |
71920 ACBGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: The P4A tolerance class ensures minimal runout and vibration, critical for applications requiring extreme positional accuracy. The 25° contact angle provides optimal stiffness under combined loading conditions.
Superior Load Capacity: Engineered to handle combined radial and axial loads efficiently. With a dynamic load rating of 4568 lbf and static load rating of 4770 lbf, it offers reliable performance in demanding applications.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the pre-lubrication enables operation at high rotational speeds up to 15,000 rpm.
Universal Matching Capability: Designed as Universal Matchable (SU), these bearings can be supplied in pre-loaded sets of 3, ensuring optimal preload and stiffness without additional adjustment during installation.
71920 ACBGA/P4A Bearing Typical Application Areas
The 71920 ACBGA/P4A is specifically engineered for high-precision, high-speed applications including:
- Machine tool spindles and high-speed machining centers
- Precision grinding spindles and dental equipment
- High-frequency motor spindles and robotics
- Aerospace positioning systems and measuring instruments
- Medical equipment requiring ultra-precise rotational accuracy
