71805 ACD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71805 ACD/P4DBC
Basic Information
System of measurement
Metric
Weight
0.042 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1433 lbf
Radial static load rating
1372 lbf
Limiting speed
103 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71805 ACD/P4DBC Bearing Product Overview & Core Advantages
The 71805 ACD/P4DBC is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Moderate / Class C specifications, ensuring high system stiffness and precise shaft positioning. Its primary advantage lies in its ability to support combined loads (radial and axial) simultaneously from both directions, making it an ideal choice for high-precision, high-speed spindles and other critical machinery components requiring minimal runout and superior performance.
71805 ACD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71805 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 25mm bore. |
| ACD | Indicates a specific contact angle of 25° and a duplex back-to-back (DB) mounting arrangement. |
| P4 | Specifies the tolerance class, denoting very high precision with tight dimensional and running accuracy tolerances. |
| DBC | Confirms the duplex back-to-back (DB) configuration and the Moderate / Class C preload applied to the set. |
71805 ACD/P4DBC Bearing Structural Features & Performance Benefits
- High Rigidity & Axial Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing moment rigidity and providing excellent resistance to overturning moments, ensuring stable shaft operation under combined loads.
- Superior Precision: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and exceptional dimensional stability, which is critical for applications requiring high positional accuracy.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the 25° contact angle offers a balanced capability for handling axial and radial loads, contributing to a high limiting speed of 103,000 rpm.
- Robust Load Capacity: With a dynamic load rating of 1433 lbf and static load rating of 1372 lbf, the bearing is engineered for demanding duty cycles and long service life.
- Premium Materials: Components made from chrome steel provide high hardness, wear resistance, and durability under a wide temperature range from -30°C to 110°C.
71805 ACD/P4DBC Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Indexing tables, rotary encoders, and measuring instruments.
- High-Frequency Motors & Spindles: Where minimal vibration and high running accuracy are paramount.
- Medical & Dental Equipment: High-speed handpieces and precision surgical tools.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical navigation components.
