708 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
708 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.011 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
22 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
9
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
731 lbf
Radial static load rating
308 lbf
Limiting speed
110 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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708 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 708 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional rotational accuracy and running smoothness. Its core advantages include the ability to accommodate combined radial and axial loads in one direction, facilitated by a 15° contact angle. The use of a ceramic ball and phenolic resin cage combination enables superior high-speed performance and thermal stability, making it ideal for demanding, high-accuracy spindle assemblies.
708 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 708 | Basic Bearing Series/Size Designation | Defines the core dimensions: 8mm bore, 22mm OD, 7mm width. |
| C | 15° Contact Angle | Optimized for high-speed operation and moderate axial load capacity. |
| DG | Universal Matchable (DU) | The bearing is manufactured to be universally matchable with another identical bearing to form a preloaded duplex set (DB, DF, DT). |
| A | Extra Light Preload | Indicates the bearing is supplied with a minimal internal preload, maximizing high-speed capability and minimizing running torque. |
| HCP4A | Tolerance Class & Material Specification | P4A denotes super precision tolerances. "HC" likely indicates the use of Hybrid Ceramic components (ceramic balls with steel rings). |
708 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life at very high speeds. It also provides inherent electrical insulation.
- Phenolic Resin Cage: This lightweight, high-strength cage material offers excellent dimensional stability and low friction, further contributing to the bearing's exceptional limiting speed of 110,000 rpm.
- Super-Precision P4A Tolerance: Tighter-than-standard bore, OD, and width tolerances ensure minimal runout and vibration, which is critical for achieving the highest levels of machining accuracy and surface finish.
- Universal Matching (SU/DU): This feature allows for the flexible creation of preloaded bearing sets, enabling engineers to build spindle arrangements with precisely controlled rigidity and minimal axial/radial play.
708 CDGA/HCP4A Bearing Typical Application Areas
The 708 CDGA/HCP4A is specifically designed for high-performance machinery requiring the utmost precision and speed.
- High-Frequency CNC Spindles: For precision milling, grinding, and drilling centers.
- PCB Drilling & Routing Spindles: Where high RPM and positional accuracy are paramount.
- High-Speed Automation & Robotics: In direct-drive motors and precision rotary joints.
- Aerospace & Semiconductor Manufacturing Equipment: Applications demanding reliability and precision in critical processes.
