71821 ACDGB/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71821 ACDGB/P4
Basic Information
System of measurement
Metric
Weight
0.32 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.004mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
35
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4860 lbf
Radial static load rating
6412 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71821 ACDGB/P4 Bearing Product Overview & Core Advantages
The 71821 ACDGB/P4 is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a single bearing in a universally matchable (SU) pair, it excels in handling combined loads—significant radial loads and unidirectional axial loads—thanks to its 25° contact angle. Manufactured to P4 tolerance class, it ensures superior running accuracy, making it ideal for high-speed spindles and precision machinery. Its compact design, with a 105 mm bore and 13 mm width, provides a space-saving solution without compromising performance.
71821 ACDGB/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71821 | Basic bearing designation indicating size series and 105 mm bore diameter. |
| AC | Angular Contact design, optimized for combined radial and axial loads. |
| D | High ball count and optimized internal geometry for increased load capacity. |
| GB | Light preload (Class B), ensuring minimal axial play and enhanced rigidity. |
| /P4 | High precision tolerance class for applications requiring extreme running accuracy. |
71821 ACDGB/P4 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and phenolic cage design enable the bearing to handle substantial combined loads with high rigidity, minimizing deflection under operational stresses.
- Precision Performance: Manufactured to P4 tolerance standards, the bearing ensures exceptional dimensional accuracy and smooth operation, critical for high-speed and high-precision applications.
- Optimized for High Speeds: The lightweight phenolic cage and balanced internal geometry contribute to stable operation at high rotational speeds, with a limiting speed of 16,000 rpm.
- Superior Material Construction: Made from chrome steel for both rings and balls, the bearing offers high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
- Universal Matchability: Designed as a universally matchable (SU) bearing, it can be paired with another identical bearing in a back-to-back (DB) or face-to-face (DF) arrangement to handle bidirectional axial loads or increase system rigidity.
71821 ACDGB/P4 Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling heads.
- High-Speed Motors: Electric spindles and precision motor applications requiring minimal vibration.
- Precision Instruments: Measuring devices, optical equipment, and laboratory apparatus.
- Robotics: Joint and arm mechanisms where accuracy, rigidity, and compact design are essential.
