71804 ACDGA/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71804 ACDGA/P4
Basic Information
System of measurement
Metric
Weight
0.018 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
32 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
17
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
819 lbf
Radial static load rating
562 lbf
Limiting speed
121 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 60.13
/ each
In Stock
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71804 ACDGA/P4 Bearing Product Overview & Core Advantages
The 71804 ACDGA/P4 is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a 25° contact angle and P4 tolerance class, it excels at handling combined loads—simultaneously supporting substantial radial loads and axial loads in one direction. Its compact cross-section, with a 20 mm bore and 7 mm width, makes it ideal for space-constrained, high-precision assemblies such as machine tool spindles. The bearing is pre-lubricated and features a lightweight phenolic cage, contributing to its high limiting speed of 121,000 rpm and superior dynamic response.
71804 ACDGA/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle, optimized for high axial load capacity. |
| DGA | Indicates a Universal Matchable (SU) bearing. Two bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to support axial loads in both directions. |
| P4 | Denotes a super-precision tolerance class, ensuring extremely tight running accuracy for high-speed, high-rigidity applications. |
71804 ACDGA/P4 Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance standards with exceptionally tight dimensional tolerances on the bore, outside diameter, and width. This ensures minimal runout and superior system stiffness, which is critical for maintaining accuracy under load.
- Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces and allows for a higher limiting speed. The open design and pre-lubrication facilitate efficient cooling and minimal friction at ultra-high rotational speeds.
- Superior Load Capacity: The 25° contact angle and high-grade chrome steel construction provide an excellent balance between radial and one-direction axial load carrying capability, as reflected in its dynamic (819 lbf) and static (562 lbf) load ratings.
- Universal Matching Capability (SU): As a Universal Matchable bearing, the 71804 ACDGA/P4 can be precisely paired with another identical bearing without selective mounting. This simplifies installation and creates a pre-loaded set capable of handling combined loads from both axial directions.
71804 ACDGA/P4 Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Rotary Systems: High-frequency spindles, measuring instruments, and optical scanners.
- Advanced Robotics: Joints and actuators requiring high rigidity and positional accuracy.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other critical navigation components.
