71909 ACB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71909 ACB/P4A
Basic Information
System of measurement
Metric
Weight
0.13 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
27
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1580 lbf
Radial static load rating
1238 lbf
Limiting speed
38 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:
$ 353.56
/ each
In Stock
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71909 ACB/P4A Bearing Product Overview & Core Advantages
The 71909 ACB/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional performance. Positioned in the P4 (ABEC-7) tolerance class, it is designed to handle significant combined loads—simultaneously supporting high radial loads and thrust loads in one direction. Its optimized internal geometry, including a 25° contact angle, ensures high rigidity and operational accuracy, making it an ideal choice for high-speed spindles and other precision machinery where reliability is paramount.
71909 ACB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71909 ACB/P4A is decoded as follows:
- 71909: Basic series designation for a high-precision, single-row angular contact ball bearing.
- ACB: Signifies specific internal design optimizations for contact angle and internal clearance, typically denoting a 25° contact angle and a specific preload condition.
- P4A: Indicates the tolerance class P4 (ABEC-7), ensuring extremely tight dimensional and running accuracy for high-precision applications.
71909 ACB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a phenolic resin cage, this bearing offers superior dimensional stability and minimal runout, essential for maintaining precision under high-speed operation.
- Superior Load Capacity: The 25° contact angle and robust construction using chrome steel for rings and balls enable it to handle high combined radial and axial loads efficiently.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the pre-lubrication and open design facilitate effective lubrication distribution, contributing to a high limiting speed of 38,000 rpm.
- Preload Availability: The bearing is supplied with a preload, which minimizes axial and radial play, enhancing system stiffness and rotational accuracy from the start of operation.
71909 ACB/P4A Bearing Typical Application Areas
The 71909 ACB/P4A is ideally suited for high-performance applications requiring precision and speed, including:
- Machine Tool Spindles
- High-Speed Grinding & Milling Heads
- Precision Instrumentation
- Medical Equipment Spindles
- Aerospace Actuation Systems
