S7008 CE/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7008 CE/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.38 kg
Tolerance class
P4A
Seal type
Sealed
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
30 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4478 lbf
Radial static load rating
3442 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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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S7008 CE/P4ADBB Bearing Product Overview & Core Advantages
The S7008 CE/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This matched back-to-back (DB) arrangement is preloaded to Light / Class B standards, providing superior stability and resistance to complex combined loads (radial and axial). Manufactured to the exacting P4A tolerance class, it is an ideal solution for high-speed spindles and other precision machinery requiring high rigidity and operational reliability.
S7008 CE/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| CE | Indicates a 15° contact angle, optimized for high-speed performance. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7 standards. |
| DBB | Specifies a Duplex Back-to-Back (DB) matched set arrangement, providing high moment rigidity. |
S7008 CE/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement and light preload create a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational accuracy.
- Superior Load Capacity: The 15° contact angle and robust construction enable the bearing to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to a high limiting speed of 41,000 rpm. The standard grease lubrication is suitable for this operational range.
- Precision Engineering: Manufactured from chrome steel for rings and balls, and held to P4A dimensional tolerances, this bearing guarantees smooth, quiet, and vibration-free operation.
S7008 CE/P4ADBB Bearing Typical Application Areas
This precision duplex bearing is ideally suited for:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Grinding Equipment
- Other high-performance machinery requiring high rotational accuracy, rigidity, and speed capability.
