719/8 CE/P4ADBA
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
719/8 CE/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.014 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
19 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
9
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
632 lbf
Radial static load rating
274 lbf
Limiting speed
220 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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719/8 CE/P4ADBA Bearing Product Overview & Core Advantages
The 719/8 CE/P4ADBA is a metric precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This bearing features a duplex back-to-back (DB) arrangement with an extra light preload (Class A), making it ideal for high-precision spindles and systems where minimal deflection under load is critical. Its compact design, with a 8 mm bore and 19 mm outside diameter, provides a high-performance solution in a minimal space envelope. The bearing is pre-lubricated and operates effectively within a temperature range of -30°C to 110°C.
719/8 CE/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 719/8 CE/P4ADBA is decoded as follows:
- 719: High-precision angular contact bearing series
- 8: Bore diameter of 8 mm
- CE: Standard 15° contact angle
- P4A: Tolerance class P4A, denoting very high dimensional and running accuracy
- DB: Duplex Back-to-Back matched arrangement
- A: Extra light preload class
719/8 CE/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity and Accuracy: The duplex back-to-back (DB) arrangement and P4A tolerance class provide superior system stiffness and exceptional running accuracy, essential for applications like machine tool spindles.
- Optimized for Combined Loads: The 15° contact angle enables the bearing to efficiently support combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic resin cage ensures stable operation and contributes to the high limiting speed of 220,000 rpm.
- Precision Components: Manufactured from chrome steel for both rings and balls, ensuring high durability and long service life under demanding conditions.
719/8 CE/P4ADBA Bearing Typical Application Areas
This precision bearing is typically used in:
- High-frequency machine tool spindles
- Precision grinding applications
- High-speed dental handpieces
- Other high-performance machinery requiring high rigidity and extreme rotational accuracy
