729 ACD/P4A
Miniature Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
729 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
9
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
893 lbf
Radial static load rating
360 lbf
Limiting speed
90 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:
$ 104.84
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
729 ACD/P4A Bearing Product Overview & Core Advantages
The 729 ACD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, it is optimized to accommodate combined loads, primarily handling significant axial loads in one direction while supporting radial loads. Its compact design, featuring a 25° contact angle and preload availability, ensures high system stiffness and precise shaft positioning, making it ideal for demanding, high-speed machinery.
729 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| 729 | Basic series designation, indicating the bearing's metric dimensions (9mm bore, 26mm OD, 8mm width). |
| AC | Angular Contact design, optimized for combined radial and axial loads. |
| D | Indicates a high-capacity internal design, typically featuring larger or more balls for increased load rating. |
| P4A | The P4 suffix denotes a very high precision tolerance class (ABEC-7). The A suffix indicates a specific contact angle of 25 degrees. |
729 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and availability of preload provide superior axial and radial stiffness, minimizing deflection under load for enhanced machining or positioning accuracy.
- Optimized Load Capacity: The high-capacity "D" design with 9 precision balls increases the dynamic and static load ratings, enabling reliable operation under demanding combined loads.
- High-Speed Capability: The lightweight and durable phenolic resin cage ensures stable ball guidance and reduced centrifugal forces, contributing to a high limiting speed of 90,000 rpm.
- Precision-Grade Performance: Manufactured to P4 (ABEC-7) tolerance standards, this bearing guarantees minimal runout and consistent performance, which is critical for high-speed spindles and precision instruments.
729 ACD/P4A Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high speed, precision, and rigidity, such as:
- Machine Tool Spindles (e.g., CNC milling and grinding spindles)
- High-Frequency Motors and Precision Gearboxes
- Robotic Drives and Automated Handling Systems
- Medical and Dental Equipment (e.g., high-speed handpieces)
- Aerospace Actuators and Instrumentation
