KD040AR0
1/2" Constant Section Bearings
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Part No.
Part No.
KD040AR0
Basic Information
Bearing type
Ball
System of measurement
Inch
Thin section bearings type
Reali-Slim Open
Construction
Single Row
Weight
0.8 lbs
Tolerance class
ABEC-1
ISO radial rating
3708 lbf
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
4"
Bore diameter tolerance
-0.0008" – 0"
Outside diameter
5"
Outside diameter tolerance
-0.0006" – 0"
Width
0.5"
Width tolerance
+.000 –.005"
Contact angle
30 °
Inner Ring Dimensions
Shoulder diameter inner ring
4.37"
Outer Ring Dimensions
Outer ring large-side face inner diameter
4.741"
Outer ring small-side face inner diameter
4.63"
Performance
Temperature range
-30°C to 110 °C
Radial dynamic load rating
1819 lbf
Radial static load rating
3550 lbf
Axial static load rating
4260 lbf
Static load moment
10260 lbf
Lubrication
Lubricated
Radial internal clearance
0.0000 – 0.0005"
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 93.3
/ each
In Stock
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KD040AR0 Bearing Product Overview & Core Advantages
The KD040AR0 is a thin-section angular contact ball bearing engineered for applications demanding high precision and space optimization. Featuring a single-row design with a 30° contact angle, it is specifically configured to handle significant combined loads—simultaneously supporting radial loads and thrust loads in one direction. Its ABEC-1 precision class and inch dimensions (4" bore, 5" OD, 0.5" width) make it an ideal component for compact, high-performance assemblies where weight and cross-section are critical constraints.
KD040AR0 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| KD | Series designation for Reali-Slim® thin-section bearings. |
| 040 | Indicates a 4-inch bore diameter. |
| A | Signifies a 30° contact angle, optimized for combined load capacity. |
| R0 | Specifies an open (unsealed) bearing construction. |
KD040AR0 Bearing Structural Features & Performance Benefits
- High Load Capacity & Rigidity: The angular contact design and 30° contact angle enable the bearing to efficiently support high radial dynamic load ratings (1819 lbf) and exceptional axial static load ratings (4260 lbf). The brass cage ensures stable ball guidance under high-speed operation and complex loading conditions.
- Precision & Accuracy: Manufactured to ABEC-1 tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing guarantees predictable performance and precise shaft positioning.
- Optimized for Space & Weight: As part of the Reali-Slim Open Bearings family, it provides a large bore diameter relative to its ultra-thin cross-section (0.5" width), contributing to lightweight (0.8 lbs) and compact machinery designs.
- Material & Lubrication: Constructed from chrome steel for rings and balls, offering high durability and wear resistance. The bearing is supplied lubricated, ready for installation and operation within a temperature range of -30°C to 110°C.
KD040AR0 Bearing Typical Application Areas
This bearing is ideally suited for precision machinery and systems where a slim profile and high load capacity are paramount. Key applications include:
- Robotics and automation arms (for joint and pivot points)
- Aerospace control mechanisms and actuation systems
- Medical Equipment such as MRI scanners and surgical robots
- Semiconductor Manufacturing equipment (e.g., wafer handling robots)
- Optical Positioning Systems and rotary tables
