7038 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7038 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
8.03 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
190 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
290 mm
Outside diameter tolerance
-0.013mm to 0
Width
46 mm
Width tolerance
-0.24mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
22
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
55575 lbf
Radial static load rating
68625 lbf
Limiting speed
9 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 3808.24
/ each
In Stock
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7038 CD/HCP4A Bearing Product Overview & Core Advantages
The 7038 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its 15° contact angle and P4 (ABEC-7) tolerance class, ensuring superior running precision. Its core advantages include the ability to accommodate combined radial and axial loads simultaneously, high-speed capability enabled by a phenolic cage and ceramic balls, and availability with a factory-applied preload for immediate high-stiffness performance in compact installations.
7038 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7038 CD/HCP4A provides specific technical details:
- 7038: Basic designation indicating a metric series bearing with a 190 mm bore and 290 mm outside diameter.
- C: Denotes a 15° contact angle.
- D: Indicates the bearing is supplied with a preload for enhanced rigidity.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4: Specifies the P4 tolerance class (equivalent to ABEC-7), denoting very high precision.
- A: Indicates a 30° contact angle (this may seem contradictory to the 'C' designation; for absolute clarity, the provided specification of 15° should be considered definitive for this specific item).
7038 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic (Si3N4) balls significantly reduces friction, lowers operating temperature, and extends service life. This construction is ideal for high-speed applications and offers improved resistance to electrical erosion.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at the limiting speed of 9,000 rpm, offering excellent strength-to-weight ratio and guidance.
- High-Precision & Preload: Manufactured to a P4 tolerance class, this bearing guarantees minimal runout and vibration. The applied preload (D) eliminates internal clearance, resulting in greater shaft rigidity, precise rotational accuracy, and improved system natural frequency.
- Superior Load Capacity: With a dynamic load rating of 55,575 lbf and a static load rating of 68,625 lbf, this bearing is designed to handle significant combined loads.
7038 CD/HCP4A Bearing Typical Application Areas
This high-performance bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision and rigidity are critical.
- Precision Robotics: Arm joints and rotary actuators requiring high accuracy and responsiveness.
- High-Frequency Motors and Spindles: Applications demanding low friction and high rotational speeds.
- Medical and Dental Equipment: Surgical handpieces and imaging scanner gantries.
- Aerospace and Defense Systems: Gyroscopes, radar platforms, and other precision guidance systems.
