S7004 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7004 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.06 kg
Tolerance class
P4A
Seal type
Sealed
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
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1960 lbf
Radial static load rating
968 lbf
Limiting speed
100 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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S7004 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S7004 CDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional speed and rigidity. As a single bearing from a universally matchable (SU) set, it is designed to accommodate combined loads, specifically radial and one-directional axial loads. Its core advantages stem from a P4A super-precision tolerance, a ceramic ball construction, and a phenolic cage, enabling superior high-speed performance, reduced friction, and extended service life in critical machinery.
S7004 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Benefit |
|---|---|---|
| S7004 | Bearing series and size designation (20mm bore, 42mm OD, 12mm width). | Defines the bearing dimensions and basic capacity. |
| C | 15° contact angle. | Optimized for high-speed operation and axial load capacity. |
| DG | Universal matchable bearing designation. | Allows for precise preload adjustment when mounted with a second, universally matched bearing. |
| A | Extra light preload class. | Minimizes friction and heat generation for maximum limiting speed. |
| HCP4A | Combined tolerance and material code: HC (Hybrid Ceramic), P4A (Super Precision). | Signifies the use of ceramic balls for high-speed, low-heat operation and P4A tolerance class for extreme running accuracy. |
S7004 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and provides electrical insulation, resulting in exceptional high-speed performance and durability.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability at high speeds and is well-suited for the high accelerations and decelerations common in precision applications.
- Super-Precision P4A Tolerance: Tighter bearing dimensions and running accuracy ensure minimal vibration and precise shaft positioning, which is critical for the rigidity and surface finish in machining operations.
- Optimized Load Capacity: The 15° contact angle and precision grinding enable the bearing to handle significant combined loads (radial and axial) with high reliability.
- Sealed & Grease-Lubricated: The sealed design with factory-applied grease provides long-term, maintenance-free operation by effectively excluding contaminants and retaining lubrication.
S7004 CDGA/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Robotics: Arm joints and high-accuracy rotary actuators.
- High-Frequency Motors & Spindles: Motors for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
