S7004 ACEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7004 ACEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.059 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
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1609 lbf
Radial static load rating
731 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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In Stock
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S7004 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The S7004 ACEGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional speed and rigidity. As a universally matchable (SU) single bearing with an extra light preload (Class A), it is designed to be paired to form a precise back-to-back (DB) arrangement. Its core advantages include the ability to handle combined radial and axial loads simultaneously, superior running accuracy from its P4A tolerance class, and outstanding high-speed performance enabled by its phenolic cage and ceramic balls. This configuration offers a compact, high-rigidity solution for the most critical spindle applications.
S7004 ACEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S7004 ACEGA/HCP4A provides detailed technical specifications:
- S7004: Denotes the bearing series and size (20mm bore, 42mm OD, 12mm width).
- A: Indicates a 25° contact angle, optimized for carrying higher axial loads.
- C: Signifies the use of Ceramic (Si3N4) balls, which reduce centrifugal forces, lower operating temperature, and enable higher speeds.
- EGA: Specifies that the bearing is pre-lubricated with Grease.
- HC: Refers to the Phenolic (Polyamide) cage, which is lightweight and ideal for high-speed operation.
- P4A: Represents a super-precision tolerance class with enhanced running accuracy and dimensional stability.
S7004 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and universal matching design allow for the creation of a preloaded set that provides high system rigidity and excellent capacity for combined loads.
- Superior High-Speed Performance: The combination of ceramic balls and a lightweight phenolic cage significantly reduces rotating mass and friction, enabling the bearing to achieve its high limiting speed of 100,000 rpm.
- Precision & Longevity: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration. The sealed and pre-greased design offers long-term, maintenance-free operation within a wide temperature range of -30°C to 110°C.
- Thermal Stability: Ceramic balls have a lower coefficient of thermal expansion than steel, which helps maintain preload and precision under varying operating temperatures.
S7004 ACEGA/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where speed, precision, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors and generators.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
