71811 ACD/P4
71800 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71811 ACD/P4
Basic Information
System of measurement
Metric
Weight
0.081 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.007mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
29
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2151 lbf
Radial static load rating
2295 lbf
Limiting speed
24 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:
$ 502.23
/ each
In Stock
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71811 ACD/P4 Bearing Product Overview & Core Advantages
The 71811 ACD/P4 is a single-row angular contact ball bearing designed for applications requiring high precision and superior rigidity. Engineered to a P4 (ABEC-7) tolerance class, it excels in handling combined loads, primarily thrust loads in one direction, making it ideal for high-speed spindles and precision machinery. Its compact design, with a 9 mm width, allows for space-saving installations without compromising performance.
71811 ACD/P4 Bearing Model Code Explained, Specifications & Naming Convention
The model number 71811 ACD/P4 is decoded as follows:
- 71811: Basic series designation for a single-row, angular contact ball bearing.
- A: Denotes a 25° contact angle, optimized for high axial load capacity.
- C: Indicates a phenolic (polyamide) cage, which contributes to lower friction, quieter operation, and suitability for higher speeds.
- D: Signifies that the bearing is supplied with a light preload. This preload increases system rigidity, reduces vibration, and improves rotational accuracy.
- P4: The tolerance class, equivalent to ABEC-7. This signifies extremely tight dimensional and running accuracy tolerances for demanding, high-precision applications.
71811 ACD/P4 Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 precision class standards, this bearing ensures minimal runout and exceptional rotational accuracy. The specified preload (D) further enhances system stiffness, making it critical for machine tool spindles and other high-precision equipment.
- Optimized Load Capacity: With a 25° contact angle, the 71811 ACD/P4 is engineered to support significant axial loads in one direction while also accommodating radial loads. Its dynamic load rating of 2151 lbf and static load rating of 2295 lbf confirm its robust performance.
- High-Speed Capability: The lightweight phenolic cage (C) reduces centrifugal forces, allowing for a high limiting speed of 24,000 rpm. This makes it an excellent choice for high-speed applications.
- Premium Materials: Constructed from chrome steel for both rings and balls, the bearing offers high durability and resistance to wear. It comes pre-lubricated for immediate use within its specified temperature range.
71811 ACD/P4 Bearing Typical Application Areas
The 71811 ACD/P4 angular contact ball bearing is ideally suited for:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Robotics (Articulated arms, high-accuracy joints)
- High-Frequency Motors and Spindles
- Medical and Dental Equipment (High-speed handpieces, scanners)
- Aerospace Instrumentation and other applications demanding high rigidity and exceptional running accuracy.
