71905 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71905 CDGA/P4A Bearing Product Overview & Core Advantages
The 71905 CDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers extremely tight dimensional and running accuracy. Its extra light preload (Class A) minimizes deflection under light loads, making it ideal for high-precision spindles. The bearing is universally matchable (SU), allowing for precise axial play adjustment when mounted in pairs, and comes pre-lubricated for immediate operation.
71905 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 9mm width) |
| C | 15° contact angle, optimized for high-speed operation |
| DG | Universal matchable (Universal Matchable (SU)) for paired mounting |
| A | Extra light preload (Class A) for minimal deflection |
| /P4A | Super-precision tolerance class, exceeding ABEC 7 standards |
71905 CDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The phenolic resin cage and optimized internal geometry, including the 15° contact angle, enable a high limiting speed of 100,500 rpm, making it a true high-speed bearing.
High Rigidity & Accuracy: Manufactured to P4A tolerance class with a bore and outside diameter tolerance of -0.004mm to 0, this bearing ensures exceptional running accuracy and system rigidity, critical for precision machining.
Optimized Load Capacity: As an angular contact ball bearing, it is designed to support combined loads (radial and axial) simultaneously. The dynamic and static load ratings of 1521 lbf and 900 lbf, respectively, provide reliable performance under demanding conditions.
Ready-to-Install: The bearing is pre-lubricated, ensuring immediate and reliable operation upon installation within its specified temperature range of -30°C to 110°C.
71905 CDGA/P4A Bearing Typical Application Areas
The 71905 CDGA/P4A is ideally suited for high-performance applications requiring extreme precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors: Spindles for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes and navigation instruments.
