71821 ACDGC/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71821 ACDGC/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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71821 ACDGC/P4 Bearing Product Overview & Core Advantages
The 71821 ACDGC/P4 is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. Engineered to a P4 tolerance class, this bearing excels in handling combined loads (radial and axial) simultaneously. Its optimized design, featuring a 25° contact angle and moderate preload (Class C), ensures high running accuracy and stiffness, making it ideal for high-speed spindles and precision machinery where minimal deflection is critical.
71821 ACDGC/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71821 | Basic bearing designation, defining the core dimensions (105mm bore, 130mm OD, 13mm width). |
| AC | Angular Contact design, optimized for combined loads. |
| D | High ball count and optimized internal geometry for increased load capacity. |
| GC | Specific internal clearance and preload grouping for moderate preload (Class C). |
| /P4 | High-Precision Tolerance Class, ensuring extremely tight dimensional and running accuracy. |
71821 ACDGC/P4 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design with a 25° contact angle and moderate preload provides superior stiffness, effectively resisting operational deflection. It supports significant combined radial and axial loads (Dynamic: 4860 lbf, Static: 6412 lbf).
- Precision & High-Speed Performance: Manufactured to P4 tolerance standards with a phenolic cage, this bearing ensures minimal vibration and stable operation at high speeds (limiting speed: 16,000 rpm). The cage material contributes to lower friction and is suitable for high rotational accuracy.
- Universal Matching Capability (SU): Designed as a Universal Matchable bearing, it can be paired with another identical bearing in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to create a matched set that meets specific application requirements for preload and stiffness.
- Material & Lubrication: Constructed from chrome steel for rings and balls, offering high durability and wear resistance. The bearing is pre-lubricated for immediate operation within a temperature range of -30°C to 110°C.
71821 ACDGC/P4 Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, CNC indexing heads.
- High-Speed Drives: Electric motor spindles, high-frequency spindles.
- Medical & Laboratory Equipment: Centrifuges, precision scanners.
