7038 ACD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7038 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
28.5 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
138 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
114075 lbf
Radial static load rating
198000 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7038 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 7038 ACD/P4ATBTB is a **high-precision angular contact ball bearing** designed for demanding applications requiring exceptional rigidity and accuracy. This **triplex back-to-back (TBT) matched set** provides superior stability and load-carrying capacity. Engineered to a **P4A tolerance class**, it offers extremely tight dimensional control for applications where minimal runout and high rotational accuracy are critical. Its **25° contact angle** is optimized to handle significant combined loads, including heavy radial and thrust loads simultaneously. Pre-loaded as a matched set, it ensures **high system rigidity** and precise shaft positioning right from installation.
7038 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7038 | Basic bearing series, defining the standard boundary dimensions (Bore: 190mm, OD: 290mm, Width: 138mm). |
| ACD | **Angular Contact** design with a **25° contact angle**. |
| P4A | Indicates a **super-precision tolerance class**, exceeding normal P4 standards for enhanced running accuracy. |
| TBT | Specifies a **Triplex Back-to-Back** matched arrangement of three bearings. |
| (Light / Class B Preload) | The set is supplied with a **light preload** to maximize rigidity and minimize axial/radial play under operational conditions. |
7038 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The **triplex back-to-back (TBT) arrangement** creates a highly rigid bearing system capable of supporting substantial **combined radial and axial loads**. The **25° contact angle** is specifically chosen for optimal thrust load capacity while maintaining excellent radial load performance.
- Super-Precision Performance: Manufactured to **P4A tolerance class**, this bearing ensures extremely low noise, minimal vibration, and superior running accuracy, which is essential for high-speed, high-precision machinery.
- Optimized Internal Geometry: The design incorporates 22 high-grade chrome steel balls with a diameter of 30.162 mm, contributing to the high **dynamic and static load ratings** (114,075 lbf and 198,000 lbf respectively).
- High-Speed Capability: The **phenolic cage** is lightweight and robust, enabling stable operation at the specified **limiting speed** and reducing centrifugal forces and friction.
- Material Integrity: Constructed from through-hardened **chrome steel** for both rings and balls, providing high wear resistance and long service life under demanding conditions.
7038 ACD/P4ATBTB Bearing Typical Application Areas
This precision bearing is ideally suited for applications requiring the highest levels of accuracy and rigidity, such as:
- High-Precision Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Spindles for PCB drilling and routing
- Precision Gearboxes and transmission systems
- Industrial Pumps and Compressors operating at high speeds
- Advanced Robotics and automation equipment
