Thin section bearings: product types, structural features, and application scenarios

Our full range of thin-walled bearing products is manufactured using high-quality raw materials and precision production processes, with stringent quality control measures in place. We offer customized selection and design services tailored to customers' specific operating conditions, load types, installation space, and precision requirements.

Thin section bearings are specialized mechanical bearings developed through precision manufacturing processes. Their core characteristic is the small thickness ratio between the inner and outer diameters (typically less than 10% of the bearing diameter). These bearings offer advantages such as lightweight design, compact structure, low friction, and high rotational speed, making them essential transmission components in fields like precision machinery and automated equipment. Based on the type of rolling elements, contact forms, and structural features, precision thin-section bearings are primarily classified into three categories: equal-section thin-walled ball bearings, thin section crossed roller bearings, and thin section tapered roller bearings. Among these, equal-section thin-walled ball bearings serve as the core product series, offering the broadest application scenarios and meeting various light-load, high-precision transmission requirements.

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Core Product System of thin section bearings
I. Equal-Section Thin-Walled Ball Bearings
Equal-section thin-walled ball bearings are the flagship product of this series. Their core advantage lies in maintaining a constant cross-sectional dimension within the same series, regardless of the inner diameter size. This allows for a uniform installation space across varying inner diameter requirements, significantly enhancing design flexibility for equipment. The product line includes seven diameter series (AA, A, B, C, D, F, G), each with three width series, one of which is an ultra-wide series. These bearings can be equipped with seals or dust covers on one or both sides, meeting diverse sealing and protection needs.
The cross-sectional dimensions cover various specifications with inner diameters ranging from 19.05 mm to 1016 mm, accommodating a wide range of applications from micro-precision instruments to large industrial equipment. The standard core cross-sectional dimensions (radial thickness H×width B) include 4.76×4.76 mm, 6.35×6.35 mm, 7.94×7.94 mm, 9.525×9.525mm, 12.7×12.7mm, etc. Additionally, extended-width specifications such as 6.35×9.525 mm, 7.94×11.11mm, and 9.525×12.7mm are available to meet higher installation and protection requirements.
Based on contact type and functional application, equal-section thin-walled ball bearings are further subdivided into four categories, each available in open or sealed designs:
1.    Radial Contact Thin-section Ball Bearings (Type C)
Featuring a single-row deep groove ball structure, these bearings excel in radial load capacity while accommodating light-to-medium axial loads and slight overturning moments, making them a general-purpose, fundamental option suitable for high-speed rotation scenarios.

2.    Angular Contact Thin-section Ball Bearings (Type A)
With a contact angle of approximately 30°, these bearings offer excellent axial load capacity. They can be used individually or in paired configurations (face-to-face, back-to-back, or tandem), enabling them to handle bidirectional axial loads and overturning moments when paired, meeting high-precision positioning requirements.
3.    Four-Point Contact Thin-section Ball Bearings (Type X)
These bearings form four-point contact between the balls and raceways, providing exceptional axial load and overturning moment capacity. They can support bidirectional axial loads and are ideal for rotational scenarios requiring precise moment control.
4.    Duplex Thin-section Ball Bearings
Composed of two angular contact thin-walled ball bearings (Type A) arranged in face-to-face, back-to-back, or tandem configurations, these bearings integrate the axial load advantages of Type A while offering higher overall rigidity and positioning accuracy. They are well-suited for high-demand precision transmission applications.

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II. Thin Section Crossed Roller Bearings
With rollers arranged at a 90° angle in a crossed configuration, these bearings typically feature a split-structure design for the inner and outer rings. Compared to ball bearings, they offer significantly higher rigidity and positioning accuracy, allowing them to simultaneously withstand radial loads, axial loads, and overturning moments while maintaining minimal rotational clearance. These properties make them a core choice for high-precision rotational mechanisms. The product line is categorized into the following series to meet the high-precision requirements of different rotational modes:
CRB Series: Outer ring split, inner ring integrated, suitable for inner ring rotation.
CRA Series: Outer ring split, inner ring integrated, a general-purpose design balancing compactness and load capacity.
CRE Series: Inner ring split, outer ring integrated, suitable for outer ring rotation.

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III. Thin Section Tapered Roller Bearings
Featuring a tapered roller structure, thin section tapered roller bearings can support combined loads consisting of radial loads and unidirectional axial loads. They offer high rigidity and excellent load-carrying capacity. Compared to thin-walled ball bearings, they are better suited for precision scenarios requiring a combination of light and heavy loads, addressing some of the load-bearing limitations of thin section structures.
 

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II. Core Structure and Performance Features of thin section bearings
1.    Thin-Section Precision Structure with Strong Space Adaptability
With low wall thickness ratios for the inner and outer rings, as well as compact cross-sectional and axial dimensions, these bearings can be integrated into limited installation spaces, making them ideal for designs with high demands for structural compactness. The entire product series undergoes strict precision control, ensuring minimal dimensional errors in key parameters such as inner/outer ring diameters and wall thickness. This guarantees operational stability and consistency.

2.    Optimized for Light Loads with Excellent Dynamic Performance
Specifically designed for light-load conditions, these bearings are not suitable for high-load or impact-load scenarios. Under rated light loads, they maintain an extremely low coefficient of friction—achieved through high-precision machining of the inner and outer ring surfaces combined with specialized lubricants—resulting in minimal rotational resistance and smooth operation. Additionally, through optimized structural design and the use of high-quality materials, the bearings support high rotational speeds, meeting the dynamic performance requirements of high-speed motors, precision turntables, and similar equipment.

3.    Lightweight Design to Reduce Equipment Inertia
Compared to traditional bearings, the thin-walled structure significantly reduces material usage, resulting in lighter products. This effectively decreases the overall weight burden of the equipment, reduces operational inertia, and enhances the responsiveness of equipment in terms of start-up, braking, and speed regulation. These features make the bearings particularly suitable for applications where weight and inertia are critical factors.

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III. Applicable Application Scenarios of Thin Section Bearings
Leveraging their core advantages of lightweight design, high precision, low friction, and high rotational speed, thin-walled bearings are widely suitable for precision transmission requirements across various industries:
1.    Equal-Section Thin-Walled Ball Bearings (Types C/A/X, Duplex):
Ideal for high-speed motors, precision instruments, robotics, semiconductor equipment, servo systems, small rotary tables, and more.
2.    Thin-Walled Crossed Roller Bearings:
Suitable for applications requiring high positioning accuracy and rigidity, such as industrial robot joints, precision medical equipment, high-precision indexing tables, and CNC rotary tables.
3.    Thin-Walled Tapered Roller Bearings:
Well-suited for heavy-duty precision rotary tables, precision components in construction machinery, and transmission systems, particularly in scenarios combining light and heavy loads for precision transmission.

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Our full range of thin-walled bearing products is manufactured using high-quality raw materials and precision production processes, with stringent quality control measures in place. We offer customized selection and design services tailored to customers' specific operating conditions, load types, installation space, and precision requirements. With meticulous craftsmanship and robust performance, our thin-walled bearings provide reliable transmission solutions to ensure the stable and efficient operation of various precision machinery. Please contact us for the solution of thin section bearings.