High-precision thin section bearings for industrial robots. Lightweight, compact design with high load capacity, low friction torque, and long service life. Available in deep groove, angular contact, and four-point contact types, with multiple open and sealed series options.
Overview of Thin Section Bearings
Thin section bearings are a key component in industrial robots, especially in critical joint applications like the elbow, wrist, and waist. Alongside crossed cylindrical roller bearings, they are among the most widely used bearing types in robotics.
As industrial robots evolve towards lightweight and compact designs, bearings must fit into limited installation spaces while delivering low weight and high performance. Modern robots demand high load capacity, high rotational accuracy, smooth operation, fast positioning, repeatable precision, long service life, and exceptional reliability.
Why Thin Section Bearings Are Ideal for Robotics
Thin section bearings are specifically designed to meet these requirements. They offer:
High precision for accurate positioning
High load-carrying capacity despite small size
Low friction torque for energy-efficient movement
High rigidity to maintain stability under load
Long service life for reduced maintenance
A unique design feature is their constant cross-section - the section size remains the same within each series, even as the bore diameter increases. This ensures greater load capacity compared to conventional bearings of similar size, making them ideal for compact, high-load robot joints.
Technical Range and Configurations
Equal-section thin section ball bearings are available in:
- 7 open series and 5 sealed series
- Bore diameter range: 1 inch to 40 inches
- Cross-section dimensions: from 0.1875 × 0.1875 inch to 1.000 × 1.000 inch
Three design types:
- Deep Groove Ball Bearings (C type) – Support both radial loads and bidirectional axial loads
- Angular Contact Ball Bearings (A type) – Designed for combined loads in one direction with higher speed capacity
- Four-Point Contact Ball Bearings (X type) – Capable of carrying radial, axial (both directions), and moment loads simultaneously
Material options:
- GCr15 (Chrome steel) for general high-precision use
- Stainless steel for corrosion resistance in harsh environments
All three bearing designs are available across different series, with the series selection based on cross-section size. Ball size and count are matched to the series to achieve optimal load capacity and performance.
Product Categories of Thin Section Bearings
Open Type Series
Suitable for applications with clean environments and external lubrication supply
Sealed Series
Equipped with shields or seals to protect against contamination and retain lubrication
Deep Groove Ball Type (C)
Supports radial and axial loads in both directions
Angular Contact Type (A)
Handles combined radial and axial loads in one direction; ideal for precision motion control
Four-Point Contact Type (X)
Manages radial, axial (both directions), and moment loads simultaneously; ideal for robotic joints and rotary tables
Key Benefits
Lightweight and space-saving design
High rigidity and stability under load
Low friction torque for smooth operation
High rotational precision and repeatability
Long lifespan with consistent performance
Applications in Industrial Robots
Thin section bearings are widely used in:
Robotic elbow joints for precise articulation
Robotic wrists for smooth, high-accuracy rotation
Robot waist assemblies where space is limited but load capacity is critical
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