7038 CDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7038 CDGA/P4A
Basic Information
System of measurement
Metric
Weight
9.51 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
190 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
290 mm
Outside diameter tolerance
-0.004mm to 0
Width
46 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
55575 lbf
Radial static load rating
68625 lbf
Limiting speed
11 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7038 CDGA/P4A Bearing Product Overview & Core Advantages
The 7038 CDGA/P4A is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the premium P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its defining characteristic is the 15° contact angle and Universal Matchable (SU) design, allowing bearings to be paired in a duplex set to achieve optimal preload and system rigidity. This bearing is pre-lubricated and features an open seal type for maximum speed capability, making it an ideal solution for machine tool spindles and other high-performance machinery requiring superior precision and reliability.
7038 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7038 CDGA/P4A is decoded as follows:
- 7038: Standard bore (190 mm) and outside diameter (290 mm) designation.
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- DG: Indicates that the bearing is Universal Matchable (SU). Two identical bearings can be mounted together in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to support combined loads.
- A: Specifies an Extra light preload (Class A). This preload eliminates internal clearance, enhancing system stiffness and rotational accuracy.
- P4A: Represents a very high tolerance class superior to ABEC 7 (P4), ensuring extremely tight dimensional and running accuracy limits.
7038 CDGA/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance class with an Extra light preload, this bearing provides exceptional running accuracy and system stiffness, minimizing deflection under load.
- Optimized for High Speeds: The 15° contact angle and phenolic resin cage reduce friction and centrifugal forces, enabling a high limiting speed of 11,000 rpm. The open design facilitates efficient lubrication and cooling.
- Superior Load Capacity: Designed to handle combined radial and axial loads simultaneously. The high-grade chrome steel construction provides a dynamic load rating of 55,575 lbf and a static load rating of 68,625 lbf.
- Universal Matching Capability: The Universal Matchable (SU) feature allows for simplified installation and precise preload control when used in matched sets of 2, ensuring optimal performance in demanding applications.
7038 CDGA/P4A Bearing Typical Application Areas
This precision bearing is ideally suited for applications requiring high speed, rigidity, and accuracy, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace Positioning Systems
- Medical and Laboratory Equipment
