729 CD/P4A
Miniature Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
729 CD/P4A
Basic Information
System of measurement
Metric
Weight
0.02 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
9 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
26 mm
Outside diameter tolerance
-0.005mm to 0
Width
8 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
9
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
922 lbf
Radial static load rating
374 lbf
Limiting speed
100 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 104.36
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
729 CD/P4A Bearing Product Overview & Core Advantages
The 729 CD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily combined loads (simultaneous radial and axial loads), its 15° contact angle provides optimal axial load capacity. Manufactured to P4 (ABEC-7) tolerance class, this bearing delivers superior running accuracy, low noise, and high-speed performance, making it ideal for demanding, precision machinery where reliability is critical.
729 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 729 | Basic bearing series designation. |
| CD | Indicates a specific internal design with a 15° contact angle and optimized internal geometry for high precision and high-speed operation. |
| P4 | Denotes the tolerance class, equivalent to ABEC-7. This signifies extremely tight dimensional and running accuracy tolerances. |
| A | Specifies that the bearing is supplied with a preload to eliminate internal clearance, enhancing system rigidity and rotational accuracy. |
729 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design with a phenolic resin cage ensures stable operation and minimal deformation under load. The P4 precision grade guarantees exceptional running accuracy for applications requiring minimal runout.
- Optimized Load Capacity: The 15° contact angle is engineered to efficiently support significant axial loads in one direction while also handling radial loads, making it suitable for combined load conditions.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design and pre-lubrication facilitate efficient lubrication, enabling operation at the high limiting speed of 100,000 rpm.
- Pre-Lubricated for Immediate Use: The bearing is factory-lubricated, ensuring immediate startup and reliable initial operation, reducing the need for immediate maintenance.
729 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Electric Spindles
- Precision Grinding Equipment
- High-Speed Pumps and Compressors
- Robotic Arm Joints and Precision Gearboxes
