7004 ACD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7004 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
0.2 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4005 lbf
Radial static load rating
2745 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7004 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 7004 ACD/P4ATBTB is a super-precision angular contact ball bearing designed for the most demanding applications. This matched triplex set in a back-to-back (TBT) arrangement is engineered to provide exceptional system rigidity and stability. Its defining characteristics include a P4A tolerance class for superior running accuracy, a light preload (Class B) for optimal performance under high speeds, and a 25° contact angle for excellent axial load capacity. This combination makes it an ideal solution for machine tool spindles and other high-precision machinery requiring uncompromising accuracy and high rigidity.
7004 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series and size designation (20mm bore, 42mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates an ultra-high precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for superior running accuracy. |
| TBT | Specifies a Triplex Back-to-Back matched set of three bearings, providing maximum system rigidity and moment load capacity. |
7004 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machine tool spindles.
- Superior Precision and High-Speed Capability: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration. The phenolic cage and light preload contribute to lower friction and enable a high limiting speed of 103,000 rpm, making it a true high-speed bearing.
- Optimized Load Capacity: The 25° contact angle is engineered to handle significant combined loads, providing a robust balance between radial and axial load carrying capabilities.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, the bearing ensures high durability and long service life under demanding operating conditions.
7004 ACD/P4ATBTB Bearing Typical Application Areas
This precision bearing is specifically designed for high-performance applications where extreme accuracy, rigidity, and speed are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and milling spindles.
- Precision Rotary Systems: High-frequency spindles for PCB drilling and precision engraving.
- Advanced Medical Equipment: Spindles for dental handpieces and high-speed surgical tools.
- Automated Robotics: High-precision joints and rotary actuators requiring minimal backlash.
