7008 ACEGA/HCP4AL1
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 ACEGA/HCP4AL1
Basic Information
System of measurement
Metric
Weight
0.17 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
15 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2632 lbf
Radial static load rating
1620 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
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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7008 ACEGA/HCP4AL1 Bearing Product Overview & Core Advantages
The 7008 ACEGA/HCP4AL1 is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features a 25° contact angle and is manufactured to P4A super-precision tolerance, ensuring minimal runout and vibration. Its core advantages include the ability to handle combined radial and axial loads simultaneously, superior high-speed capabilities facilitated by its phenolic cage and ceramic balls, and universal matchability (SU), allowing for flexible mounting configurations in preloaded sets to achieve maximum system rigidity and rotational accuracy.
7008 ACEGA/HCP4AL1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 15mm width). |
| AC | Angular Contact design. |
| EGA | Extra light (Class A) preload and universal matchable (SU) designation. |
| HCP4A | Hybrid Ceramic (Silicon Nitride) balls and P4A super-precision tolerance class. |
| L1 | Light pre-lubrication. |
7008 ACEGA/HCP4AL1 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic (Silicon Nitride) balls with chrome steel rings significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially in high-speed applications up to 41,000 rpm.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction, contributing to smooth operation and high limiting speed.
- Super-Precision P4A Tolerance: Guarantees extremely tight dimensional and running accuracy, which is critical for applications requiring high positional accuracy and minimal vibration.
- Optimized Load Capacity: The 25° contact angle provides an excellent balance between radial and axial load carrying capacity (Dynamic: 2632 lbf, Static: 1620 lbf), making it suitable for combined loads.
- Universal Matchability (SU): Bearings are universal matchable, allowing any two bearings to be paired in a back-to-back (DB) or face-to-face (DF) arrangement to create a preloaded set that delivers high system rigidity.
7008 ACEGA/HCP4AL1 Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary units.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: CT scanner gantries and high-speed centrifuges.
