Type A Angular Contact Thin Section Ball Bearings

Type A Angular Contact Thin Section Ball Bearings

Thin section angular contact ball bearings are specifically engineered for applications that require compact dimensions, high rotational accuracy, and reliable axial load performance. Compared with conventional deep groove ball bearings, this bearing design provides improved thrust load capacity while maintaining a lightweight and space-saving structure.

Our thin section angular contact bearings are widely used in robotics, medical equipment, aerospace systems, semiconductor machinery, optical instruments, automation equipment, and precision rotary platforms where installation space is limited but performance stability remains critical.

Structural Design and Operating Principle

The thin section angular contact ball bearing adopts an angular contact raceway geometry developed from a deep groove ball bearing structure. Engineers reduce the shoulder height on one side of either the inner ring or outer ring raceway to create a defined contact angle between the rolling elements and the raceway. This design allows the bearing to simultaneously support radial loads and unidirectional axial loads.

The bearing incorporates a circular pocket separator together with a snap-lock assembly structure. This configuration improves rolling element distribution and allows the bearing to accommodate a larger number of balls within a compact cross section. As a result, the bearing achieves higher axial stiffness, smoother rotational performance, and improved operational stability under combined loading conditions.

Because axial force is transmitted through the contact angle, the bearing performs particularly well in high-speed applications requiring accurate shaft positioning and reduced deflection.

Enhanced Axial Load Capacity

Thin section angular contact ball bearings are designed primarily for applications involving combined radial and axial loads. Compared with radial deep groove ball bearings and four-point contact bearings of similar dimensions, this bearing type delivers significantly higher axial load carrying capability.

The optimized internal geometry allows the rolling elements to distribute load more evenly across the raceway surface, which helps reduce localized stress concentration and improves service life under demanding operating conditions.

A-type bearings typically require an external thrust load during operation to maintain the designed contact angle, commonly ranging from 20° to 30°. For applications involving bidirectional axial loads, matched bearing sets are usually installed in paired arrangements to ensure system rigidity and operational accuracy.

Available mounting arrangements include:

Face-to-Face Arrangement (DF)

Back-to-Back Arrangement (DB)

Tandem Arrangement (DT)

Custom Multi-Bearing Configurations

Our engineering team can also provide customized matched bearing solutions according to shaft structure, load direction, rotational speed, and installation requirements.

Key Features and Performance Advantages

Compact and Lightweight Design

The thin cross-section design helps equipment manufacturers reduce overall system size and weight without sacrificing load capacity or precision.

High Axial Rigidity

The angular contact structure provides excellent axial stiffness, making the bearing suitable for precision positioning systems and high-speed rotating assemblies.

Smooth High-Speed Operation

The optimized raceway profile and precision ball arrangement minimize friction and vibration during operation.

Improved Load Distribution

The brass cage design helps maintain stable rolling element spacing and reduces heat generation during continuous operation.

Reliable Performance in Harsh Environments

The bearing operates effectively within a temperature range of -20°C to 180°C, making it suitable for industrial environments involving heat, continuous rotation, or fluctuating operating conditions.

Flexible Mounting Options

Different paired configurations allow the bearing system to accommodate varying axial load directions and structural requirements.

Technical Specifications

High-Quality Material Selection

We manufacture the bearing rings and rolling elements using premium-grade 52100 chrome steel. This high-carbon chromium alloy steel offers excellent hardness, wear resistance, and fatigue strength, ensuring stable operation under repeated load cycles.

The brass cage provides superior mechanical strength and maintains reliable ball guidance during high-speed rotation. Compared with standard stamped steel cages, brass cages improve lubrication retention and help reduce friction under demanding working conditions.

Each bearing undergoes strict dimensional inspection and running accuracy testing before shipment to ensure consistent product quality and operational reliability.

Typical Applications

Thin section angular contact ball bearings are suitable for equipment requiring compact structures, precise rotational control, and stable axial support, including:

Industrial Robots

Medical Imaging Equipment

Semiconductor Manufacturing Machines

Aerospace Positioning Systems

Precision Turntables

Radar Equipment

Optical Inspection Systems

Packaging Machinery

CNC Rotary Tables

Automated Assembly Equipment

Custom Bearing Solutions Available

Different industrial applications often require unique mounting structures, preload settings, lubrication methods, or material specifications. Our engineering team can provide customized thin section angular contact bearing solutions based on your operational requirements.

Customization options include:

Custom dimensions

Matched bearing sets

Special preload configurations

Stainless steel materials

Ceramic ball options

Customized lubrication

Surface coating treatments

Higher precision grades

Why Choose Our Thin Section Angular Contact Ball Bearings

We focus on delivering precision bearing solutions that combine compact design, stable rotational accuracy, and long-term durability. Our manufacturing process emphasizes dimensional consistency, material quality, and reliable operational performance for demanding industrial applications.

By combining optimized raceway geometry, precision machining, and high-quality raw materials, our thin section angular contact ball bearings help equipment manufacturers improve system efficiency, reduce installation space, and extend equipment service life.

If you require technical support, dimensional selection assistance, or customized bearing solutions, our engineering team is available to help you identify the most suitable configuration for your application.

Thin Section Angular Contact Ball Bearings NKAA Series (3/16″X 3/16″)

A-TYPE–Thin Section Bearings

Contact Angle: 20°- 30°

Seals Type: Open

Series: NKAA

Inner Diameters: 1.000 inch (25.4 mm)-1.750 inch (44.45 mm)

Outer Diameters: 1.375 inch (34.925 mm)- 2.125 inch (53.975 mm)

Weight:0.011 kg-0.020 kg

Thin Section Angular Contact Ball Bearings NKA Series (1/4″X 1/4″) 

A-TYPE–Thin Section Bearings

Contact Angle: 20°- 30°

Seals Type: Open

Series: NKA

Inner Diameters: 2.000 inch (25.4 mm)-12.000 inch (44.45 mm)

Outer Diameters: 2.500 inch (63.500 mm)- 12.500 inch (317.500 mm)

Weight:0.045 kg-0.245 kg

Thin Section Angular Contact Ball Bearings NKB Series (5/16″X 5/16″)

A-TYPE–Thin Section Bearings

Contact Angle: 20°- 30°

Seals Type: Open

Series: NKB

Inner Diameters: 2.000 inch (50.800 mm)-20.000 inch (508.000 mm)

Outer Diameters: 2.625 inch (66.675 mm)- 20.625 inch (523.875 mm)

Weight:0.068 kg-0.635 kg

Thin Section Angular Contact Ball Bearings NKC Series (3/8″X 3/8″)

A-TYPE–Thin Section Bearings

Contact Angle: 20°- 30°

Seals Type: Open

Series: NKC

Inner Diameters: 4.000 inch (50.800 mm)-20.000 inch (508.000 mm)

Outer Diameters: 4.750 inch (66.675 mm)- 20.750 inch (527.050 mm)

Weight:0.200 kg-0.921 kg

Thin Section Angular Contact Ball Bearings NKD Series (1/2″X 1/2″)

A-TYPE–Thin Section Bearings

Contact Angle: 20°- 30°

Seals Type: Open

Series: NKD

Inner Diameters: 4.000 inch (101.600 mm)-5.000 inch (127.000 mm)

Outer Diameters: 20.000 inch (508.000 mm)- 21.000 inch (533.400 mm)

Weight:0.363 kg-1.660 kg

Thin Section Angular Contact Ball Bearings NKF Series (3/4″X 3/4″)

A-TYPE–Thin Section Bearings

Contact Angle: 20°- 30°

Seals Type: Open

Series: NKF

Inner Diameters: 4.000 inch (101.600 mm)-5.000 inch (127.000 mm)

Outer Diameters: 20.000 inch (508.000 mm)- 21.500 inch (546.100 mm)

Weight:0.875 kg-4.040 kg

Thin Section Angular Contact Ball Bearings NKG Series (1″X 1″)