71804 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71804 ACD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.036 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
14 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
1332 lbf
Radial static load rating
1125 lbf
Limiting speed
121 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71804 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71804 ACD/P4DBA is a metric precision angular contact ball bearing supplied as a duplex back-to-back (DB) matched set. Engineered for applications demanding high rigidity and excellent running accuracy, this bearing is preloaded to Extra Light (Class A) specifications, making it ideal for managing combined loads (radial and axial) in both directions simultaneously. Its P4 tolerance class ensures superior dimensional and rotational precision for high-performance machinery.
71804 ACD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series and size designation (20mm bore, 32mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings supplied as a set). |
| DB | Matched arrangement: Back-to-Back. This configuration provides high moment rigidity. |
| P4 | Tolerance class P4, denoting very high precision. |
| A | Preload: Extra Light (Class A) for minimal friction and optimal high-speed operation. |
71804 ACD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring exceptional operational stability.
- Superior Precision: Manufactured to P4 tolerance class with a 25° contact angle, this bearing guarantees high running accuracy and precise positioning, which is critical for advanced mechanical systems.
- Optimized for High Speeds: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the high limiting speed of 121,000 rpm. The Extra Light preload (Class A) further minimizes friction and heat generation.
- High Load Capacity: With a radial dynamic load rating of 1332 lbf and a static rating of 1125 lbf, the set is capable of handling significant combined radial and axial loads.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and long service life.
71804 ACD/P4DBA Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance applications where high speed, high rigidity, and extreme accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment (e.g., drill handpieces)
- Aerospace Actuation Systems
- Advanced Robotics and Automation
