71805 ACD/P4TBTF
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71805 ACD/P4TBTF
Basic Information
System of measurement
Metric
Weight
0.063 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
21 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
1917 lbf
Radial static load rating
2059 lbf
Limiting speed
103 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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71805 ACD/P4TBTF Bearing Product Overview & Core Advantages
The 71805 ACD/P4TBTF is a precision angular contact ball bearing engineered for applications demanding exceptional rigidity and accuracy. This bearing is supplied as a Triplex Back-to-Back (TBT) matched set, consisting of three individual bearings pre-configured to deliver superior performance under combined loads. Its design is optimized for high-speed operation and high system stiffness, making it an ideal choice for machine tool spindles and other precision rotary equipment. The P4 tolerance class ensures minimal runout and precise rotational accuracy.
71805 ACD/P4TBTF Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for carrying combined radial and axial loads. |
| P4 | Indicates a high-precision tolerance class, providing extremely tight dimensional and running accuracy. |
| TBT | Denotes a Triplex Back-to-Back matched arrangement. This configuration significantly increases system rigidity and moment load capacity. |
| F | Specifies that the bearing is lubricated from the factory for immediate use. |
71805 ACD/P4TBTF Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an extremely rigid support system, capable of handling heavy combined loads (radial and axial) and high moment loads. This is critical for maintaining precision in demanding applications.
- Optimized for High Speeds: The use of a lightweight, durable phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 103,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity for high-speed performance.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing ensures minimal vibration and precise running accuracy. The tight bore diameter and outside diameter tolerances guarantee a consistent and reliable fit in high-precision assemblies.
- Robust Material Construction: Both the rings and balls are made from chrome steel, offering high hardness, wear resistance, and a long operational lifespan under demanding conditions.
71805 ACD/P4TBTF Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: High-frequency spindles for PCB drilling and engraving.
- Industrial Pumps & Compressors: Applications requiring high axial and radial stiffness.
- Robotics: High-accuracy joints and rotary actuators.
