KB120AR0
5/16" Constant Section Bearings
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Part No.
Part No.
KB120AR0
Basic Information
Bearing type
Ball
System of measurement
Inch
Thin section bearings type
Reali-Slim Open
Construction
Single Row
Weight
0.85 lbs
Tolerance class
ABEC-1
ISO radial rating
2853 lbf
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
12"
Bore diameter tolerance
-0.0014"– 0"
Outside diameter
12.625"
Outside diameter tolerance
-0.0014"– 0"
Width
0.3125"
Width tolerance
+.000 –.005"
Contact angle
30 °
Inner Ring Dimensions
Shoulder diameter inner ring
12.231"
Outer Ring Dimensions
Outer ring large-side face inner diameter
12.445"
Outer ring small-side face inner diameter
12.393"
Performance
Temperature range
-30°C to 110 °C
Radial dynamic load rating
1623 lbf
Radial static load rating
5840 lbf
Axial static load rating
4240 lbf
Static load moment
16860 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:
$ 411.2
/ each
In Stock
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KB120AR0 Bearing Product Overview & Core Advantages
The KB120AR0 is a thin-section angular contact ball bearing engineered for applications demanding high precision and space optimization. As part of the Reali-Slim Open Bearings series, this single-row bearing excels in handling combined radial and axial loads simultaneously, thanks to its specified 30° contact angle. Its inch-dimension design, featuring a large 12-inch bore within an ultra-slim 0.3125-inch cross-section, provides a high load capacity in a compact envelope. Manufactured to ABEC-1 precision tolerances, it is an ideal solution for high-rigidity, moderate-speed applications requiring reliable performance.
KB120AR0 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| KB120 | Denotes the specific bearing series and size (12" bore). |
| A | Indicates a 30° contact angle, optimized for carrying significant axial loads. |
| R0 | Specifies an Open (unsealed) construction, allowing for custom lubrication schemes or operation in clean environments. |
KB120AR0 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The single-row angular contact design, combined with a brass cage and chrome steel rings and balls, provides high stiffness. It offers a radial dynamic load rating of 1623 lbf and a substantial axial static load rating of 4240 lbf, making it capable of handling demanding combined loads.
- Precision & Stability: Manufactured to ABEC-1 tolerance standards with a tight radial internal clearance (0.0000 – 0.0005"), this bearing ensures smooth, precise rotation and minimal runout, which is critical for accurate positioning.
- Space-Saving Design: As a thin-section bearing, it maximizes the available design space by providing a large bore diameter relative to its minimal cross-section, ideal for compact, weight-sensitive assemblies.
- Versatile Operation: The open design and chrome steel construction allow for operation within a temperature range of -30°C to 110°C, suitable for a wide array of industrial environments.
KB120AR0 Bearing Typical Application Areas
This bearing is ideally suited for applications where a large, precise shaft must be supported within a very limited space. Key industries and equipment include:
- Robotics: Rotary joints and actuator arms.
- Aerospace & Defense: Gimbals, radar platforms, and guidance systems.
- Medical Equipment: CT scanners and MRI machinery.
- Semiconductor Manufacturing: Precision stages and wafer handling robots.
- Industrial Automation: Rotary tables and indexing heads.
