71921 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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71921 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71921 CD/P4ADGB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a light preload (Class B) duplex set, it delivers outstanding performance in high-speed spindle systems. Its P4A tolerance class ensures ultra-precise running characteristics, while the phenolic cage and optimized 15° contact angle enable superior high-speed capability and smooth operation under combined radial and axial loads.
71921 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71921 | Basic bearing designation indicating super-precision angular contact series with 105mm bore, 145mm OD, 40mm width |
| CD | Duplex arrangement with 15° contact angle on both bearings, universal matchable configuration |
| P4A | Super-precision tolerance class exceeding ABEC 7 standards for exceptional running accuracy |
| DGB | Duplex set, light preload (Class B), universal matchable arrangement for simplified mounting |
71921 CD/P4ADGB Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The duplex arrangement with two matched bearings creates a highly rigid bearing system capable of withstanding combined radial and axial loads in both directions. With a radial dynamic load rating of 22,388 lbf and static load rating of 30,825 lbf, this configuration provides exceptional load-carrying capacity for precision applications.
High-Speed Performance: The phenolic resin cage and 15° contact angle optimization enable maximum limiting speeds of 16,000 rpm. The lightweight cage design reduces centrifugal forces while maintaining ball guidance precision at elevated rotational speeds.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures minimal runout and vibration. The universal matchable design allows for flexible mounting arrangements while maintaining preload consistency.
Material Excellence: Constructed from chrome steel for both rings and balls (12.7mm diameter, 27 balls), the bearing delivers superior fatigue resistance and long service life in demanding operating conditions.
71921 CD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring exceptional rotational accuracy
- High-Speed Machining Centers: Applications demanding rapid acceleration and deceleration capabilities
- Precision Grinding Spindles: Surface and cylindrical grinding applications where minimal vibration is critical
- Industrial Pumps & Compressors: High-speed rotary equipment requiring reliable bearing performance
- Aerospace Test Equipment: Precision positioning systems and testing apparatus
- Medical Equipment Spindles: Dental milling machines and surgical device rotating assemblies
