7008 ACD/P4AQBCCGMM
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 ACD/P4AQBCCGMM
Basic Information
System of measurement
Metric
Weight
0.77 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
60 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
9518 lbf
Radial static load rating
9338 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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7008 ACD/P4AQBCCGMM Bearing Product Overview & Core Advantages
The 7008 ACD/P4AQBCCGMM is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched quadruplex back-to-back arrangement provides superior high rigidity and the ability to handle significant combined loads (radial and axial). With a P4A tolerance class and moderate preload (Class C), it is engineered for high-precision, high-reliability scenarios where operational stability is critical.
7008 ACD/P4AQBCCGMM Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series, indicating a 40 mm bore, 68 mm OD, and 60 mm width. |
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| QBCCGMM | Denotes a Quadruplex Back-to-Back (QBC) matched set of 4 bearings with specific internal clearance and preload (Moderate / Class C). |
7008 ACD/P4AQBCCGMM Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an extremely stiff bearing system, capable of supporting high combined loads from multiple directions, making it ideal for applications with complex force vectors.
- Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle, this bearing ensures minimal runout and high rotational accuracy for precise positioning.
- Optimized Cage & Speed: The phenolic cage is lightweight and robust, contributing to smooth operation and supporting a high limiting speed of 56,000 rpm.
- Material & Lubrication: Constructed from chrome steel for both rings and balls, ensuring durability and long service life. The bearing is pre-lubricated with grease suitable for a temperature range of -30°C to 110°C.
7008 ACD/P4AQBCCGMM Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery, including:
- High-speed machine tool spindles
- Precision grinding heads
- High-rigidity industrial robots
- Aerospace positioning systems
- Other equipment requiring ultra-precise, rigid, and high-speed bearing arrangements.
