7004 ACD/P4ADBD
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7004 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
0.14 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
24 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
3038 lbf
Radial static load rating
1834 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
Heavy / Class D
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
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7004 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 7004 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched set is preloaded to Heavy / Class D specifications, providing superior stiffness and minimal axial/radial runout. It excels at handling combined loads (radial and axial) simultaneously, making it ideal for high-precision, high-rigidity machinery. Manufactured to P4A tolerance class, it ensures outstanding rotational accuracy and reliable performance in demanding operational environments.
7004 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
The model number 7004 ACD/P4ADBD is decoded as follows:
- 7004: Standard bearing series designation, indicating a 20mm bore, 42mm OD, and 24mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two-bearing) configuration.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7 (P4) standards, with specific running accuracy requirements.
- DB: Specifies the Duplex Back-to-Back mounting arrangement.
- Heavy Preload (Class D): The bearings are preloaded to a heavy grade at the factory, ensuring maximum system rigidity from installation.
7004 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy combined loads.
- Precision & Accuracy: Built to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, ensuring minimal runout and vibration for smooth, accurate operation.
- Optimized Load Capacity: The 25° contact angle and duplex preload are engineered to handle significant axial loads in both directions, in addition to high radial loads.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 103,000 rpm, suitable for demanding high-speed applications.
- Durability: Components made from high-grade chrome steel provide excellent wear resistance and long service life.
7004 ACD/P4ADBD Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision, rigidity, and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Robotic Drives.
- High-Frequency Motors and Spindles.
- Medical Equipment and Optical Instrumentation.
- Aerospace Actuation Systems.
