7008 CD/P4ATBTC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 CD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
0.58 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
45 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8190 lbf
Radial static load rating
7312 lbf
Limiting speed
43 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7008 CD/P4ATBTC Bearing Product Overview & Core Advantages
The 7008 CD/P4ATBTC is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this pre-assembled set of three bearings is designed to handle significant combined loads (radial and axial) simultaneously. Manufactured to the exacting P4A tolerance class and preloaded to Moderate / Class C, it delivers high running accuracy, excellent stability, and is optimized for high-speed operation up to 43,000 rpm. Its compact, pre-matched design ensures simplified installation and reliable performance in the most demanding precision machinery.
7008 CD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series designation, indicating a 40 mm bore, 68 mm OD, and 9 mm width per single bearing. |
| CD | Indicates a triplex (3-bearing) back-to-back (DB) matched set. This arrangement provides high moment stiffness and excellent stability. |
| P4A | The tolerance class, denoting very high precision levels for both bore and outer diameter dimensions and running accuracy. |
| TBT | Confirms the Triplex Back-to-Back arrangement of the three bearings in the set. |
| C | Specifies the Moderate preload level applied to the matched set, optimizing rigidity and minimizing deflection under load. |
7008 CD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The triplex back-to-back (TBT) configuration creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning under heavy combined loads.
- Superior Load Capacity: With a 15° contact angle and three bearings sharing the load, this set offers a high dynamic load rating of 8190 lbf, making it suitable for applications with significant radial and axial force components.
- Optimized High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 43,000 rpm. The set is supplied lubricated for immediate operation.
- Precision Engineering: Conformance to the P4A tolerance class ensures minimal runout and vibration, which is critical for applications requiring high rotational accuracy and smooth operation.
- Durable Construction: Manufactured from chrome steel for both rings and balls, the bearing provides high hardness, wear resistance, and a long operational life.
7008 CD/P4ATBTC Bearing Typical Application Areas
This precision bearing set is ideally suited for high-performance applications where maximum rigidity and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for electric motors operating at very high RPM.
- Robotics: High-accuracy rotary joints and arm actuators.
