71921 ACDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71921 ACDGB/P4A Bearing Product Overview & Core Advantages
The 71921 ACDGB/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. This single bearing features a 25° contact angle and is supplied with a light preload (Class B), making it ideal for arrangements requiring high rigidity and precise rotational performance. Its P4A tolerance class ensures superior dimensional and running accuracy, while its universal matching designation (SU) allows for flexible mounting in duplex sets to handle combined loads effectively. The open design, lubricated for immediate operation, supports high-speed applications up to its limiting speed.
71921 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71921 | Basic bearing series and size designation |
| AC | Angular Contact design |
| D | High contact angle (25°) |
| GB | Light preload / Class B |
| P4A | High precision tolerance class |
71921 ACDGB/P4A Bearing Structural Features & Performance Benefits
This precision bearing delivers outstanding performance through its optimized construction. The 25° contact angle provides excellent capability for handling combined radial and axial loads. The phenolic cage ensures smooth operation at high speeds while reducing friction and weight. Manufactured to P4A tolerance standards, the bearing guarantees minimal runout and vibration for applications requiring supreme accuracy. The light preload eliminates internal clearance, enhancing system rigidity and positioning accuracy. With 27 precision balls made from chrome steel and optimized ball diameter of 12.7mm, the bearing achieves high dynamic and static load ratings of 12,870 lbf and 14,738 lbf respectively.
71921 ACDGB/P4A Bearing Typical Application Areas
The 71921 ACDGB/P4A finds extensive use in high-precision machinery and equipment including: machine tool spindles, precision grinding machines, high-speed machining centers, industrial pumps, precision instruments, robotic arms, and semiconductor manufacturing equipment. Its exceptional accuracy and high-speed capability (up to 16,000 rpm) make it particularly suitable for applications where minimal vibration and maximum rotational precision are critical requirements.
